CN114369760B - Wire rod for stress corrosion resistant ultra-high strength steel strand and manufacturing method of steel strand - Google Patents
Wire rod for stress corrosion resistant ultra-high strength steel strand and manufacturing method of steel strand Download PDFInfo
- Publication number
- CN114369760B CN114369760B CN202210014702.XA CN202210014702A CN114369760B CN 114369760 B CN114369760 B CN 114369760B CN 202210014702 A CN202210014702 A CN 202210014702A CN 114369760 B CN114369760 B CN 114369760B
- Authority
- CN
- China
- Prior art keywords
- steel strand
- percent
- stress corrosion
- steel
- wire rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 137
- 239000010959 steel Substances 0.000 title claims abstract description 137
- 238000005260 corrosion Methods 0.000 title claims abstract description 67
- 230000007797 corrosion Effects 0.000 title claims abstract description 66
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 33
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 28
- 238000001816 cooling Methods 0.000 claims abstract description 25
- 230000008569 process Effects 0.000 claims abstract description 22
- 239000000126 substance Substances 0.000 claims abstract description 14
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 12
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 11
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 11
- 238000005491 wire drawing Methods 0.000 claims abstract description 9
- 229910052796 boron Inorganic materials 0.000 claims abstract description 8
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 5
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 4
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 3
- 230000035882 stress Effects 0.000 claims description 59
- 238000012360 testing method Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 10
- 230000032683 aging Effects 0.000 claims description 7
- 229910001567 cementite Inorganic materials 0.000 claims description 7
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 claims description 7
- 238000005096 rolling process Methods 0.000 claims description 6
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 238000005554 pickling Methods 0.000 claims description 5
- 238000010583 slow cooling Methods 0.000 claims description 5
- 238000009749 continuous casting Methods 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 229910000734 martensite Inorganic materials 0.000 claims description 2
- 238000009987 spinning Methods 0.000 claims description 2
- 238000004804 winding Methods 0.000 claims description 2
- SOIFLUNRINLCBN-UHFFFAOYSA-N ammonium thiocyanate Chemical compound [NH4+].[S-]C#N SOIFLUNRINLCBN-UHFFFAOYSA-N 0.000 claims 1
- 238000007670 refining Methods 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 9
- 229910045601 alloy Inorganic materials 0.000 abstract description 5
- 239000000956 alloy Substances 0.000 abstract description 5
- 238000005098 hot rolling Methods 0.000 abstract description 4
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- 230000002829 reductive effect Effects 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 230000002180 anti-stress Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- 238000005336 cracking Methods 0.000 description 4
- 239000011229 interlayer Substances 0.000 description 4
- 238000005422 blasting Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 229910001562 pearlite Inorganic materials 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 229910000677 High-carbon steel Inorganic materials 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000011513 prestressed concrete Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 201000011510 cancer Diseases 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
A wire rod for a stress corrosion resistant ultra-high strength steel strand and a manufacturing method of the steel strand are disclosed, wherein the steel comprises the following chemical components in percentage by weight: 0.90 to 1.00 percent of C, 0.80 to 1.10 percent of Si, 0.40 to 0.50 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.020 percent of S, 0.20 to 0.50 percent of Cr0.05 to 0.10 percent of V, 0.0008 to 0.0035 percent of B, and the balance of Fe and inevitable impurities. On the basis of a 1860MPa pre-stress steel strand wire rod, the invention effectively improves and optimizes the design of conventional alloy elements, improves the content of C, si elements, reasonably adds metal elements Cr, V and B, adjusts the hot rolling and cooling control and steel strand production processes, improves the steel wire drawing process and the steel strand stabilizing production process, and develops a stress corrosion resistant ultra-high strength steel strand which can be popularized and used.
Description
Technical Field
The invention relates to the technical field of metallurgical production, in particular to a wire rod for an anti-stress corrosion ultrahigh-strength steel strand and a manufacturing method of the steel strand, which are mainly used for the ultrahigh-strength prestressed steel strand and can meet the requirement on the anti-stress corrosion performance of the ultrahigh-strength prestressed steel strand at the level of 2300MPa-2400 MPa.
Background
The prestressed steel strand is mainly used for projects such as high-speed rails, bridges and large buildings, and has the characteristics of high strength, low relaxation and the like. At present, 1860 MPa-grade steel strands are generally adopted in China. Since the last 90 s, the prestressed steel strand adopted in the field of engineering construction in China is mainly made of SWRH82B wire rods as raw materials, and the dosage of the prestressed steel strand in 1860 grade is about 360-420 ten thousand tons per year. With the improvement of the use function in recent years, the 1860 grade steel strand can not effectively meet the requirement of a large-span structure, and becomes a bottleneck problem restricting the development of a prestressed concrete structure. Meanwhile, in order to save steel and other resources and simplify the concrete structure, china is seeking to improve the tensile strength level of the steel strand and research and develop the 2300-2400MPa level steel strand. The adoption of the ultrahigh-strength prestressed steel strand can save the steel consumption, reduce the thickness of a concrete protective layer and reduce the self weight of the structure, has obvious technical and economic significance, meets the national requirements on energy conservation, emission reduction and green economy development, and is a future development trend. After the tensile strength grade of the steel strand is improved, the tension applied during tensioning is correspondingly improved, under the same environmental condition, the stress corrosion condition is severer than that of a 1860MPa grade steel strand, and the ultrahigh-strength steel strand is easier to generate stress corrosion damage. The ultrahigh-strength steel strand is produced by adopting conventional chemical components and a production process, and a stress corrosion test is difficult to be qualified. The tensile strength of the steel strand is improved, and the stress corrosion resistance of the steel strand must be improved. Therefore, aiming at the problem that the stress corrosion performance of the ultrahigh-strength steel strand is unqualified, the chemical composition design of the wire rod for the steel strand is improved, the production process of the wire rod is improved, the wire drawing process is improved in the production process of the steel strand, the temperature of a steel wire is reduced, the stabilizing treatment temperature is increased, shot blasting is carried out on the surface of the steel strand, the stress corrosion resistance performance of the ultrahigh-strength steel strand is improved, and the problem that the stress corrosion test of the ultrahigh-strength steel strand is unqualified is solved.
The common strength grade of the prestressed steel strand is 1860MPa, the common steel grade is SWRH82B, the content of C in the steel is 0.79-0.86%, the content of Si is 0.17-0.37%, the content of Mn is 0.60-0.90%, and 0.20-0.30% of Cr is added. Along with the improvement of the requirement on the strength level of the steel strand, the requirement on the 2300MPa-2240MPa level steel strand is provided. The steel type of the super-strength steel strand which is commonly used at present is 92Si and the like, wherein the steel contains 0.90-0.95% of C, 0.80-1.10% of Si, 0.40-0.50% of Mn and 0.20-0.30% of Cr. When the strength of the steel strand is increased, the tensile force under tension is increased, and the breaking time in the stress corrosion test is reduced. Therefore, in addition to improving the strength of the steel strand, the ultrahigh-strength steel strand is developed to reduce the stress corrosion sensitivity and prevent the steel strand from rapidly breaking after stress corrosion.
Patent document CN111321352A discloses 'a strength 2400 MPa-level prestressed steel strand and production process' (CN 111321352A), and the technical content disclosed by the patent document has the following problems: 1. chemical composition C of the wire rod: 0.88 to 1.02%, si:0.10% -1.30%, mn:0.30% -0.90%, P: less than or equal to 0.015 percent, S: less than or equal to 0.010 percent, cr:0.10-0.50%, V: 0.01-0.10%, al:0.01-0.08%, and the balance of Fe and inevitable impurities. The chemical composition has the advantages that the lower limit of the V content is controlled to be too low, meanwhile, the B element is not added, and the composition design is not specially carried out on the stress corrosion resistance of the steel strand; 2. through processes such as salt bath, the problem of overlarge performance difference of bad tissues and the poker due to uneven air cooling speed is solved, the rapid cooling and isothermal transformation of the wire rod are realized, and compared with the water bath adopted by the patent, the method has the differences of high cost, low yield, environmental pollution and the like; 3. the wire rod is subjected to drawing, stranding and stabilizing treatment, belongs to a conventional steel strand production process, has no special control method for stress corrosion, and has no measures for the stress corrosion resistance of the ultrahigh-strength steel strand compared with the processes of pickling and drying, low-temperature drawing, high-temperature stabilization, spraying of antirust liquid and the like.
The patent document "vanadium-silicon composite microalloyed ultrahigh strength wire rod and preparation process thereof" (CN 103122437A), the disclosed technical content has the following problems: 1. chemical composition C of the wire rod: 0.85 to 0.95%, si:0.95% -1.10%, mn: 0.50-0.60%, cr:0.20-0.35%, ti:0.01-0.05%, V: 0.11-0.15%, al:0.005-0.050%, and the balance of Fe and inevitable impurities. The carbon content of the chemical composition is low, and only steel strands below 2300MPa can be produced; 2. the preparation process sequentially comprises heating, rolling and controlled cooling, wherein the controlled cooling process adopts stelmor controlled cooling, and compared with the water bath adopted in the patent, the air cooling process has the problems of low cooling speed, uneven cooling and the like, and can cause low structure performance of the wire rod; 3. the wire rod is used for producing products such as ultrahigh-strength prestressed steel strands and galvanized steel strands, a production process control method of the steel strands is not specified, and measures aiming at the stress corrosion resistance of the ultrahigh-strength steel strands are not provided.
Disclosure of Invention
The invention aims to provide a wire rod for an anti-stress corrosion ultrahigh-strength steel strand and a manufacturing method of the steel strand, which are used for effectively improving and optimizing the conventional alloy element design, improving the C, si element content, reasonably adding metal elements Cr, V and B, adjusting the hot rolling and cooling control and steel strand production processes, improving the steel wire drawing process and the steel strand stabilizing production process and researching and developing the anti-stress corrosion ultrahigh-strength steel strand capable of being popularized and used on the basis of the 1860MPa pre-stress steel strand wire rod.
In order to achieve the purpose, the invention adopts the following technical scheme:
the wire rod for the stress corrosion resistant ultrahigh-strength steel strand comprises the following chemical components in percentage by weight: 0.90 to 1.00 percent of C, 0.80 to 1.10 percent of Si, 0.40 to 0.50 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.020 percent of S, 0.20 to 0.50 percent of Cr, 0.05 to 0.10 percent of V, 0.0008 to 0.0035 percent of B, and the balance of Fe and inevitable impurities.
The invention aims to meet the requirements of the ultrahigh-strength steel strand on improving the tensile strength and resisting stress corrosion cracking on the aspects of component design and alloy element selection, improves and optimizes the conventional alloy element design on the basis of a 1860 MPa-level wire rod for the steel strand, improves the content of C, si elements, reasonably adds the metal elements Cr, V and B, adjusts the hot rolling and cooling control and steel strand production processes, improves the steel wire drawing process and the steel strand stabilizing production process, and develops the stress corrosion resisting ultrahigh-strength steel strand which can be popularized and used. The design reason of the chemical components of the steel grade is as follows:
c is a chemical element for ensuring the strength and the structure of the wire rod, the carbon content is not lower than 0.90 percent for ensuring the strength of the product, the proportion of cementite is increased, and simultaneously, the carbon content is not higher than 1.00 percent for controlling the segregation of a continuous casting billet, controlling the structure, improving the plasticity of the wire rod and preventing the network cementite of a crystal boundary.
Si exists in a solid solution state in steel, can improve the hardenability of the steel, refines the interlayer spacing of pearlite pieces, has extremely strong strengthening effect, and simultaneously has the effect of inhibiting the formation of a net-shaped carburized body so as to better ensure the strength of a wire rod and control the structure. In addition, increasing the Si content reduces the speed of cementite spheroidization during the steel strand stabilization process, reducing strength loss.
Mn can improve the hardenability of steel, can refine a wire rod structure and a lamellar structure, and improves the strength and the plasticity, but the low-temperature structure is generated when the Mn content is too high, and the wire rod drawing performance is reduced, so the Mn content is controlled to be 0.40-0.50%.
P and S are harmful elements which can reduce the plasticity and toughness of the steel, so that the smaller the content, the better.
Cr can improve the hardenability of steel, refine the interlayer spacing of pearlite pieces, improve the strength of wire rods and improve the stress corrosion performance of steel strands. However, the Cr content is controlled to be 0.20-0.50% because the Cr content is too high, the low-temperature structure is generated, and the drawing performance of the wire rod is reduced.
V refines crystal grains, reduces the segregation of crystal boundary elements, forms a submicron V compound with C, N, is separated out during phase transformation, and can effectively improve the strength of the wire rod. Secondly, the V element can inhibit the precipitation of high-carbon steel grain boundary network cementite. Meanwhile, the V element is combined with the N element and the C element in the steel, so that the strain aging of the steel wire during drawing is reduced, and the stress corrosion resistance of the steel strand is improved. Therefore, the strength and the stress corrosion resistance of the steel strand can be improved by adding 0.05 to 0.10 percent of V element, and the stress corrosion resistance of the steel strand is improved.
B exists in a solid solution state in steel, and can improve the hardenability of the steel, refine the interlayer spacing of pearlite plates and improve the strength of a wire rod. Meanwhile, the B is combined with N in steel, so that the strain aging of the steel wire during drawing is reduced, and the stress corrosion resistance of the steel strand is improved. Therefore, the addition of 0.0008 to 0.0035 percent of the B element can improve the strength and the stress corrosion resistance of the steel strand and improve the stress corrosion resistance of the steel strand.
The manufacturing method of the stress corrosion resistant ultrahigh strength steel strand comprises the following steps:
1) The steel for the wire rod is smelted by a converter and is refined by LF, and because the steel P, S has lower content and high carbon content, low-S molten iron is selected during smelting, slag stopping and steel tapping are performed, ar is blown from the top in a tank, and the LF is refined to produce reducing slag, so that the molten steel is ensured to have uniform components and low inclusion content; the liquid steel has poor fluidity and large solidification shrinkage, and the drawing speed is controlled to be not more than 0.6m/min during continuous casting; because Si-containing steel has poor thermal conductivity and is easy to crack and burn, the total furnace time of billet heating before continuous rolling cogging is not less than 4h, and the temperature is 1200-1250 ℃; the heating temperature of the steel billet in the wire rod factory is 1050-1100 ℃, and the V element is ensured to be dissolved;
2) The steel drawing coefficient is controlled during the rolling of the wire rod, the surface quality is ensured, the water cooling and air cooling flow is controlled according to different specifications, the spinning temperature is 910 +/-15 ℃, an online water bath cooling and water outlet slow cooling process is adopted to replace the conventional off-line salt bath or lead bath process, the water bath cooling speed can reach more than 15 ℃/s, the sorbite rate of the wire rod is ensured to be more than 90 percent, the sorbite interlayer spacing is less than 120nm, the slow cooling process is adopted after the water bath, the cooling speed is less than 1 ℃/s, the low-temperature tissue of the wire rod is avoided, the uniform deformation of the wire rod in the drawing process is ensured, and the stress corrosion performance of the steel strand is improved;
3) After pickling and phosphating the wire rod, carrying out heat preservation at 200-250 ℃ for 3-7h for artificial aging, discharging residual and absorbed hydrogen atoms in steel after rolling and pickling the wire rod, and improving the stress corrosion resistance; the steel wire drawing adopts the water cooling and air cooling of a winding drum, the temperature of the steel wire is reduced, and the temperature of a steel wire outlet does not exceed 120 ℃; the steel wire does not produce strain aging and dislocation plugging, hydrogen atom aggregation is prevented, and the stress corrosion resistance is improved;
4) Because the content of Si in the steel is improved, the spheroidization speed of cementite in the stabilizing treatment process of the steel strand is reduced, and the strength loss is reduced, so that the heating temperature can be increased to 430-440 ℃ during the stabilizing treatment of the steel strand, the stress corrosion resistance of the steel strand is improved, and meanwhile, the tensile strength of the steel strand can be ensured to meet the ultrahigh strength requirement. In addition, before the steel strand is packaged, the surface is uniformly sprayed with antirust liquid, so that the stress corrosion resistance of the steel strand is further improved. The minimum value of the fracture time of the steel strand stress corrosion test is more than or equal to 2.5h, and the median value is more than or equal to 5.5h.
The section of the continuous casting billet is 280 mm multiplied by 380mm 2 The square billet is about 8m in length.
The wire rod microstructure is mainly sorbite, the sorbite content is more than 90%, the inter-lamellar spacing is less than 120nm, low-temperature structures such as netlike cementite and martensite are avoided, the tensile strength is 1400-1450MPa, the tensile strength of the steel strand is guaranteed to reach 2300-2400MPa, and the reduction of area is more than or equal to 25%.
Compared with the prior art, the invention has the beneficial effects that:
1) The components of the invention consider the requirements of mechanical properties such as tensile strength of 2300-2400MPa and the like, consider the problem of stress corrosion sensitivity increase after the tensile strength is improved, prevent strain aging generated in the drawing process of the steel wire by optimizing chemical components and adding Cr, V and B elements, improve the stress corrosion resistance of the steel strand, reduce the strength loss during the stabilizing heating of the steel strand by adding Si element, and improve the stress corrosion resistance of the steel strand by improving the stabilizing heating temperature while ensuring the strength. The stress corrosion resistance of the steel strand is further improved by controlling the steel wire drawing process and spraying the antirust liquid.
2) The invention ensures that the components are easy to control stably during smelting through reasonable optimization of the components of each element, and adjusts the rolling cooling process to obtain the wire rod with more excellent performance. The steel strand processed by the wire rod through the process is subjected to stress corrosion performance test, and the stress corrosion performance test shows that: the steel strand produced by the wire rod for the 2300-2400MPa grade steel strand has the stress corrosion performance reaching the standard requirement, the shortest time standard requirement of the stress corrosion test is 2 hours, the actual time is 2.5-3.0 hours, and the median standard requirement is more than 5 hours, and the actual time is 5.5-6.0 hours.
Drawings
FIG. 1 is a microstructure view (500X) of the wire rod of the present invention;
FIG. 2 is a longitudinal microstructure (500X) of the steel wire in the steel strand according to the present invention.
Detailed Description
The following examples are intended to illustrate the invention in detail, and are intended to be a general description of the invention, and not to limit the invention.
The following are the production processes corresponding to the respective chemical components of the examples and comparative examples of the present invention. Wherein, table 1 shows the specific component design of the comparative example and the wire rod example of the invention, table 2 shows the controlled cooling process of the hot rolling production of the comparative example and the wire rod example of the invention, table 3 shows the mechanical property test results of the comparative example and the wire rod example of the invention, table 4 shows the production process of the steel strand of the comparative example and the example of the invention, table 5 shows the mechanical properties of the steel strand of the comparative example and the example of the invention, and table 6 shows the stress corrosion property test results of the comparative example and the example of the invention.
TABLE 1 Steel grade chemical composition (wt%)
TABLE 2 controlled Cooling Process conditions
TABLE 3 mechanical property test results of wire rod
TABLE 4 Steel wire production process
| Specification mm | Wire drawing speed m/s | The temperature of the stabilized heating is lower | Rust preventionAgent for treating cancer |
| Comparative example | 2.0-3.0 | 390-410 | Is not sprayed |
| Example 1 | 1.5-2.5 | 430-440 | Spraying of paint |
| Example 2 | 1.5-2.5 | 430-440 | Spraying of paint |
| Example 3 | 1.5-2.5 | 430-440 | Spraying of paint |
TABLE 5 test results of stranded wire properties
TABLE 6 stress Corrosion test results
Aiming at the problem of stress corrosion cracking of the 2300MPa-2400 grade steel strand, the invention improves the production process of the wire rod by improving the chemical composition design of the wire rod for the steel strand, improves the wire drawing process in the production process of the steel strand, reduces the temperature of the steel wire, improves the stabilizing treatment temperature, performs shot blasting on the surface of the steel strand and other measures, improves the stress corrosion resistance of the ultrahigh-strength steel strand, and solves the problem of unqualified stress corrosion test of the ultrahigh-strength steel strand.
Through the analysis to super strength steel strand wires stress corrosion cracking reason, each element is to the influence of steel strand wires stress corrosion sensibility, and alloy element is to restraining the effect of high carbon steel wire strain ageing and reducing stress corrosion cracking sensibility, confirm to adopt high carbon high silicon steel, improve the Si content, through adding Cr, V, B element, adopt water bath and slow cooling technology production wire rod, adopt after pickling stoving, reduce the steel wire temperature, improve steel strand wires production tempering temperature, improve the stabilization treatment temperature, measures such as steel strand wires surface shot-blasting, when improving steel strand wires intensity, improve super strength steel strand wires anti stress corrosion performance, solve the unqualified problem of super strength steel strand wires stress corrosion test. The invention is based on solving the problem of stress corrosion of the ultrahigh-strength prestressed steel strand, is applied to the industries such as steel strands for prestressed concrete, railways, highways and the like, has excellent mechanical property, stress corrosion resistance and economy and has wide market prospect.
Claims (5)
1. The manufacturing method of the stress corrosion resistant ultrahigh-strength steel strand is characterized in that the chemical components of the wire rod for the stress corrosion resistant ultrahigh-strength steel strand are as follows by weight percent: 0.90 to 1.00 percent of C, 0.80 to 1.10 percent of Si, 0.40 to 0.50 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.020 percent of S, 0.20 to 0.50 percent of Cr, 0.05 to 0.10 percent of V, 0.0008 to 0.0035 percent of B, and the balance of Fe and inevitable impurities;
the manufacturing method comprises the following steps:
1) Smelting steel for a wire rod by a converter, LF refining, and controlling the drawing speed to be not more than 0.6m/min during continuous casting; the total furnace-in time of heating the steel billet before continuous rolling and cogging is not less than 4 hours, and the temperature is 1200-1250 ℃; the heating temperature of the steel billet in the wire rod factory is 1050-1100 ℃;
2) The spinning temperature is 910 +/-15 ℃, an online water bath cooling and water outlet slow cooling process is adopted, the water bath cooling speed is more than 15 ℃/s, and the slow cooling speed is less than 1 ℃/s;
3) Pickling and phosphorizing the wire rod, then preserving the heat for 3-7h at 200-250 ℃, and artificially aging, wherein the steel wire drawing adopts winding drum water cooling or air cooling to reduce the temperature of the steel wire, and the temperature of a steel wire outlet does not exceed 120 ℃;
4) The heating temperature is increased to 430-440 ℃ during the stabilizing treatment of the steel strand, and the surface is evenly sprayed with antirust liquid before the steel strand is packaged.
2. The method of manufacturing a stress-corrosion-resistant ultrahigh-strength steel strand as claimed in claim 1, wherein the slab cross section is 280 x 380mm 2 The length of the square billet is 8m.
3. The method for manufacturing the stress corrosion resistant ultra-high strength steel strand as claimed in claim 1, wherein the sorbite content of the wire rod microstructure is more than 90%, the inter-lamellar spacing is less than 120nm, no netlike cementite and martensite are present, the tensile strength is 1400-1450MPa, and the reduction of area is not less than 25%.
4. The method for manufacturing the stress corrosion resistant ultra high strength steel strand as claimed in claim 1 or 3, wherein the tensile strength of the steel strand is 2300-2400MPa.
5. The method for manufacturing the stress corrosion resistant ultrahigh-strength steel strand as claimed in claim 1, wherein in a stress corrosion test using ammonium thiocyanate as a test medium, the minimum value of the fracture time of the steel strand in the stress corrosion test is not less than 2.5h, and the median value of the fracture time is not less than 5.5h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210014702.XA CN114369760B (en) | 2022-01-07 | 2022-01-07 | Wire rod for stress corrosion resistant ultra-high strength steel strand and manufacturing method of steel strand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210014702.XA CN114369760B (en) | 2022-01-07 | 2022-01-07 | Wire rod for stress corrosion resistant ultra-high strength steel strand and manufacturing method of steel strand |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114369760A CN114369760A (en) | 2022-04-19 |
| CN114369760B true CN114369760B (en) | 2023-03-17 |
Family
ID=81142133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210014702.XA Active CN114369760B (en) | 2022-01-07 | 2022-01-07 | Wire rod for stress corrosion resistant ultra-high strength steel strand and manufacturing method of steel strand |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114369760B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115341149A (en) * | 2022-08-24 | 2022-11-15 | 江苏省沙钢钢铁研究院有限公司 | Stress corrosion resistant steel strand and preparation method thereof |
| CN116145444A (en) * | 2023-01-31 | 2023-05-23 | 张家港荣盛特钢有限公司 | Preparation method of steel strand with fatigue stress amplitude above 300MPa |
| CN117110207B (en) * | 2023-06-27 | 2024-09-10 | 安徽通利预应力科技有限公司 | Online elemental analysis device for steel strand production |
| CN117845137B (en) * | 2024-01-08 | 2024-09-13 | 钢铁研究总院有限公司 | Mn-Si-V-Ti-Nb-Cr multi-element alloyed hot rolled wire rod and preparation method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107299280B (en) * | 2017-08-22 | 2019-09-10 | 青岛特殊钢铁有限公司 | 2000MPa grades of cable steel wires heat treatment wire rod and production method |
| CN108165716B (en) * | 2017-12-30 | 2019-07-19 | 江阴兴澄合金材料有限公司 | A kind of online EDC water-bath toughening processing method of high intensity bridge cable zinc-coated wire gren rod |
| KR102222579B1 (en) * | 2018-12-10 | 2021-03-05 | 주식회사 포스코 | Wire rod excellent in stress corrosion resistance for prestressed concrete steel wire, steel wire and manufacturing method thereof |
| CN111321352A (en) * | 2020-03-25 | 2020-06-23 | 中国铁道科学研究院集团有限公司 | Strength 2400 MPa-grade prestressed steel strand and production process thereof |
| CN113186388A (en) * | 2021-04-15 | 2021-07-30 | 鞍钢股份有限公司 | Controlled cooling method for ultrahigh-strength heat-treatment-free prestressed steel strand wire rod |
-
2022
- 2022-01-07 CN CN202210014702.XA patent/CN114369760B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN114369760A (en) | 2022-04-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114369760B (en) | Wire rod for stress corrosion resistant ultra-high strength steel strand and manufacturing method of steel strand | |
| CN109468530B (en) | Hot-rolled wire rod for galvanized steel wire of bridge cable rope with over 2000MPa level and production method | |
| WO2023212972A1 (en) | Low-yield-ratio, easy-to-weld and weather-proof bridge steel and manufacturing method therefor | |
| CN104928569B (en) | A kind of low density steel of 800MPa level high ductibility and its manufacture method | |
| CN109957707B (en) | Weather-resistant cold-heading steel wire rod for 1000 MPa-level fastener and production method thereof | |
| CN110172640B (en) | 500 MPa-grade high-work-hardening-rate hot-dip galvanized dual-phase steel plate and preparation method thereof | |
| US20220023929A1 (en) | Method for forming zinc-plated steel plate or steel belt having good corrosion resistance | |
| CN110527910B (en) | Preparation method of corrosion-resistant nano pearlite steel rail containing rare earth Ce and Nb elements | |
| CN111826587A (en) | Cold heading steel hot-rolled wire rod for large-size wind power bolt and preparation method thereof | |
| CN112501506B (en) | Steel wire rod for bridge cable and manufacturing method thereof | |
| CN110551939A (en) | Hot-dip galvanized steel plate with yield strength of 320MPa and production method thereof | |
| CN110607476A (en) | Manufacturing method of cold-rolled hot-galvanized high-strength structural steel with yield strength of 350MPa | |
| CN111530942A (en) | Hot rolling process of high-quality carbon structural steel | |
| CN115181916B (en) | 1280 MPa-level low-carbon low-alloy ultrahigh-strength hot dip galvanized dual-phase steel and rapid heat treatment hot dip galvanizing manufacturing method | |
| CN109957728B (en) | Weather-resistant cold heading steel wire rod for 800 MPa-level fastener and production method thereof | |
| WO2024131007A1 (en) | Low-cost 800-mpa-grade antimony-containing weathering-resistant steel for photovoltaic support, and preparation method therefor | |
| US20240167138A1 (en) | Dual-phase steel and hot-dip galvanized dual-phase steel having tensile strength greater than or equal to 980mpa and method for manufacturing same by means of rapid heat treatment | |
| CN110714165A (en) | Cold-rolled sheet for 320 MPa-level household appliance panel and production method thereof | |
| CN110578041B (en) | Corrosion-resistant superfine pearlite material added with rare earth Ce and Nb elements | |
| CN111826584B (en) | Core wire for overhead conductor and preparation method thereof | |
| CN117327974A (en) | Non-adjustable steel wire rod for 8.8-grade fastener and production method thereof | |
| CN116145036A (en) | Hot-rolled wire rod for 2100 MPa-grade or above bridge cable galvanized steel wire and production method thereof | |
| CN115181889B (en) | 1180 MPa-level low-carbon low-alloy hot dip galvanized dual-phase steel and rapid heat treatment hot dip galvanizing manufacturing method | |
| CN111733366B (en) | Aluminum-containing cold-rolled ultrahigh-strength steel and preparation method and application thereof | |
| CN109825768A (en) | A kind of 780MPa grades of ultra-thin specification hot dip galvanized dual phase steel and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |