CN113186388A - Controlled cooling method for ultrahigh-strength heat-treatment-free prestressed steel strand wire rod - Google Patents
Controlled cooling method for ultrahigh-strength heat-treatment-free prestressed steel strand wire rod Download PDFInfo
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- CN113186388A CN113186388A CN202110406134.3A CN202110406134A CN113186388A CN 113186388 A CN113186388 A CN 113186388A CN 202110406134 A CN202110406134 A CN 202110406134A CN 113186388 A CN113186388 A CN 113186388A
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- 238000001816 cooling Methods 0.000 title claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 36
- 239000010959 steel Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 230000008569 process Effects 0.000 claims abstract description 23
- 238000005485 electric heating Methods 0.000 claims abstract description 19
- 238000009987 spinning Methods 0.000 claims abstract description 14
- 238000004321 preservation Methods 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims description 11
- 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 abstract description 3
- 230000032683 aging Effects 0.000 description 8
- 150000003839 salts Chemical class 0.000 description 7
- 230000009467 reduction Effects 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000003912 environmental pollution Methods 0.000 description 4
- 229910001562 pearlite Inorganic materials 0.000 description 4
- 238000004134 energy conservation Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000004567 concrete Substances 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000006032 tissue transformation Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- 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
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
-
- 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
-
- 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
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention relates to a cooling control method for a prestressed steel strand wire rod, in particular to a cooling control method for an ultrahigh-strength heat-treatment-free prestressed steel strand wire rod. The wire rod comprises the following chemical components in percentage by weight: [C] 0.90-1.05%, 0.80-1.10% of [ Si ], 0.30-0.60% of [ Mn ], less than or equal to 0.020% of [ P ], less than or equal to 0.020% of [ S ], 0.20-0.40% of [ Cr ] and less than or equal to 0.20% of [ V ]. The cooling process is wire rod spinning → online water bath → heat preservation cover + cover internal electric heating, specifically includes: 1) controlling the spinning temperature of the wire rod to be 880-920 ℃; 2) when entering an EDC device, the temperature of the wire rod is controlled to be 800-900 ℃; controlling the temperature of the water bath to be 95-100 ℃; controlling the water outlet temperature of the wire rod to be 500-600 ℃; 3) after water is discharged, the on-line heat-insulating cover is completely closed, electric heating is carried out in the heat-insulating cover, and the electric heating temperature in the heat-insulating cover is controlled to be 300-500 ℃. The method has the advantages of good performance and tissue uniformity of the same circle, high sorbite rate, high strength of the wire rod and high surface shrinkage rate, and avoids pollution to the environment.
Description
Technical Field
The invention relates to a cooling control method for a prestressed steel strand wire rod, in particular to a cooling control method for an ultrahigh-strength heat-treatment-free prestressed steel strand wire rod.
Background
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, and is a main material for highway, railway bridge and large-span building structures, wherein the steel strand is 1860 grade steel strand. In recent years, with the improvement of use functions, 1860-grade steel strands cannot effectively meet the requirement of a large-span structure, and the strength of the steel strands becomes a bottleneck problem restricting the development of a prestressed concrete structure. The adoption of the ultrahigh-strength prestressed steel strand can not only save the steel consumption, but also reduce the thickness of a concrete protective layer and the self weight of the structure, and has remarkable technical and economic significance. Saddle steel achieves remarkable results in the aspect of developing conventional prestressed steel strand products, and produced track concrete sleepers such as large building materials, high-speed railways, subways and the like are applied to famous projects such as national large theaters, Harda high-speed railways, Jingjin wing intercity railways, Beijing subways, Zhengxu and Zhengjike specialties and the like.
At the present stage, a common sitaxol air cooling process is mainly applied to produce a wire rod for 1860-grade steel strands at home and abroad, and a small number of enterprises at home and abroad adopt a salt bath technology to produce a wire rod for 2100-2400-grade or above high-strength prestressed steel strands. The key control difficulty of the product lies in component design and structural property control, for large-specification high-carbon steel wire rods, the cooling capacity of the wire rods produced by the common Stelmor air cooling process is limited, and the structural property uniformity is poor due to the difference between lap joint and non-lap joint. The salt bath technology can reach relevant indexes, but the salt bath has high cost, low yield and environmental pollution.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a controlled cooling method of an ultrahigh-strength heat-treatment-free prestressed steel strand wire rod, which has the advantages of good same-circle performance and tissue uniformity, high sorbitizing rate, high wire rod strength and high surface shrinkage rate, and avoids environmental pollution.
In order to achieve the purpose, the invention adopts the following technical scheme:
the cooling process comprises the steps of wire rod spinning → online water bath → heat preservation cover and electric heating in the cover, and specifically comprises the following steps:
1) chemical components of the wire rod:
2) wire rod spinning temperature:
controlling the spinning temperature of the wire rod to be 880-920 ℃;
3) when entering an EDC device, the temperature of the wire rod is controlled to be 800-900 ℃; controlling the temperature of the water bath to be 95-100 ℃; the outlet water temperature of the wire rod is controlled to be 500-600 ℃.
EDC is an abbreviation of English easy drawing condenser, is a water bath controlled cooling process with a cooling speed between air cooling and lead bath, and produces wire rod with tissue performance superior to stelmor air cooling wire rod and close to the lead bath level.
The water bath process is carried out by EDC device, the wire rod enters a hot water tank with temperature above 95 ℃ after spinning, the wire rod is transported by a roller way through the water tank, the wire rod tissue transformation is realized by water cooling, and the tissue performance superior to stelmor air cooling is obtained.
4) Controlling the electric heating temperature in the heat preservation cover:
after water is discharged, the on-line heat-insulating cover is completely closed, electric heating is carried out in the heat-insulating cover, and the electric heating temperature in the heat-insulating cover is controlled to be 300-500 ℃; the electric heating time in the heat preservation cover is controlled to be 150-300 s.
Compared with the prior art, the invention has the beneficial effects that:
the method comprises the steps of enabling the ultra-high strength prestressed steel strand wire rod after spinning to enter an online lead bath-free device for hot water cooling, adopting an online artificial aging process (closing a heat preservation cover and electrically heating in the cover), and then collecting and packaging. The on-line water bath heat treatment technology can replace salt bath cooling treatment, so that the problems of high cost, low yield and environmental pollution caused by salt bath treatment are avoided. Meanwhile, the requirements of national energy conservation, emission reduction and green and economic development are met. The ultrahigh-strength prestressed steel strand wire rod produced by the method has the advantages of good same-circle performance and tissue uniformity, high sorbite rate, high strength of the wire rod and high surface shrinkage rate, saves the downstream manual aging process, reduces the process quantity, saves energy, reduces consumption and meets various index requirements of the ultrahigh-strength prestressed steel strand.
The 2300 MPa-grade non-heat-treatment prestressed steel strand wire rod produced by the process has excellent comprehensive performance, the tensile strength of the hot-rolled wire rod is above 13800MPa, the surface shrinkage is above 28 percent, the performance difference of the same circle is below 50MPa, the interlayer spacing of pearlite pieces is 80-150nm, the sorbitizing rate is above 95 percent, and the structure performance is uniform. The on-line controlled cooling adopts a lead-bath-free heat treatment process, the cooling medium is water, and the cooling agent is green, environment-friendly and pollution-free, and meets the national requirements of energy conservation, emission reduction and green economy development. And an online artificial aging treatment process is adopted, so that the downstream aging processing cost is saved, the yield is high, and the reduction production is realized. The strength of the produced steel strand is more than 2360MPa, the maximum force extension is more than 6.5%, and the index requirements of the ultrahigh-strength steel strand are well met.
Drawings
FIG. 1 shows a metallographic structure obtained by a common air-cooling process;
FIG. 2 is a metallographic structure according to the invention;
FIG. 3 shows pearlite lamellae in a conventional air-cooling process;
fig. 4 shows pearlite lamellae according to the invention.
Detailed Description
The invention discloses a controlled cooling method for an ultrahigh-strength heat-treatment-free prestressed steel strand wire rod. Those skilled in the art can modify the process parameters appropriately to achieve the desired results with reference to the disclosure herein. It is expressly intended that all such similar substitutes and modifications which would be obvious to one skilled in the art are deemed to be included in the invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.
The cooling process comprises the steps of wire rod spinning → online water bath → heat preservation cover and electric heating in the cover, and specifically comprises the following steps:
1) chemical components of the wire rod:
2) wire rod spinning temperature:
controlling the spinning temperature of the wire rod to be 880-920 ℃;
3) when entering an EDC device, the temperature of the wire rod is controlled to be 800-900 ℃; controlling the temperature of the water bath to be 95-100 ℃; the outlet water temperature of the wire rod is controlled to be 500-600 ℃.
EDC is an abbreviation of English easy drawing condenser, is a water bath controlled cooling process with a cooling speed between air cooling and lead bath, and produces wire rod with tissue performance superior to stelmor air cooling wire rod and close to the lead bath level.
The water bath process is carried out by EDC device, the wire rod enters a hot water tank with the temperature of more than 94 ℃ after spinning, is transported by a roller way through the water tank, realizes the transformation of the wire rod tissue by water cooling, and obtains the tissue performance superior to Stelmor air cooling.
4) Controlling the electric heating temperature in the heat-preserving cover
After water is discharged, the on-line heat-insulating cover is completely closed, electric heating is carried out in the heat-insulating cover, and the electric heating temperature in the heat-insulating cover is controlled to be 300-500 ℃; the electric heating time in the heat preservation cover is controlled to be 150-300 s.
[ examples ] A method for producing a compound
The chemical components of the 2300 MPa-level ultrahigh-strength lead-bath-free prestressed steel strand wire rod are composed of the following components in percentage by weight, and are shown in Table 1:
TABLE 1 chemical composition of ultra-high strength prestressed steel strand wire rod
The method for controlling cooling of the 2300 MPa-level ultrahigh-strength lead-bath-free prestressed steel strand wire rod after rolling comprises the steps of controlling chemical components of the wire rod, the spinning temperature, the temperature of the wire rod entering EDC, the water bath temperature, the water outlet temperature of the wire rod, the electric heating temperature in a heat-insulating cover and the electric heating time, wherein the process parameters are shown in a table 2:
TABLE 2 controlled Cooling Process parameters
The method comprises the steps of enabling the ultra-high strength prestressed steel strand after spinning to enter an online lead bath-free EDC device for water cooling through a wire rod, adopting an online artificial aging process (closing a heat preservation cover and electrically heating in the cover), and then collecting and packaging. The on-line water bath heat treatment technology can replace salt bath cooling treatment, so that the problems of high cost, low yield and environmental pollution caused by salt bath treatment are avoided. Meanwhile, the requirements of national energy conservation, emission reduction and green and economic development are met. And an online artificial aging treatment process is adopted, so that the downstream aging processing cost is saved, the yield is high, and the reduction production is realized. The ultrahigh-strength prestressed steel strand wire rod produced by the method has the advantages of good same-circle performance and tissue uniformity, high sorbite rate, high strength of the wire rod and high surface shrinkage rate, saves the downstream manual aging process, reduces the process quantity, saves energy, reduces consumption and meets various index requirements of the ultrahigh-strength prestressed steel strand.
Compared with the common process, the 2300 MPa-grade non-heat treatment prestressed steel strand wire rod produced by the process has better microstructure, the interlayer spacing of pearlite is 80-150nm, and the sorbitizing rate is more than 95%, as shown in figures 1-4. The combination properties of the wire rod and the steel strand are excellent, see table 3:
TABLE 3 mechanical Properties of wire rod and Steel strand
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (3)
1. The utility model provides a accuse cold method of super high strength exempts from heat treatment prestressing force steel strand wire rod which characterized in that, the cooling process is that the wire rod is spinned → online water bath → heat preservation cover + cover interior electric heating, specifically includes:
1) controlling the spinning temperature of the wire rod to be 880-920 ℃;
2) when entering an EDC device, the temperature of the wire rod is controlled to be 800-900 ℃; controlling the temperature of the water bath to be 95-100 ℃; controlling the water outlet temperature of the wire rod to be 500-600 ℃;
3) after water is discharged, the on-line heat-insulating cover is completely closed, electric heating is carried out in the heat-insulating cover, and the electric heating temperature in the heat-insulating cover is controlled to be 300-500 ℃.
2. The controlled cooling method for the ultra-high strength non-heat treatment prestressed steel strand wire rod according to claim 1, wherein the heating time of electric heating in the heat-insulating cover in step 3) is controlled within 150-300 s.
3. The controlled cooling method of the ultra-high strength non-heat treatment prestressed steel strand wire rod according to claim 1, wherein the wire rod comprises the following chemical components by weight percent: [C] 0.90-1.05%, 0.80-1.10% of [ Si ], 0.30-0.60% of [ Mn ], less than or equal to 0.020% of [ P ], less than or equal to 0.020% of [ S ], 0.20-0.40% of [ Cr ] and less than or equal to 0.20% of [ V ].
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| CN202110406134.3A CN113186388A (en) | 2021-04-15 | 2021-04-15 | Controlled cooling method for ultrahigh-strength heat-treatment-free prestressed steel strand wire rod |
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| CN202110406134.3A CN113186388A (en) | 2021-04-15 | 2021-04-15 | Controlled cooling method for ultrahigh-strength heat-treatment-free prestressed steel strand wire rod |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113699360A (en) * | 2021-09-07 | 2021-11-26 | 苏闽(张家港)新型金属材料科技有限公司 | Water-bath heat treatment process for ultra-high carbon superfine steel wire |
| CN114369760A (en) * | 2022-01-07 | 2022-04-19 | 鞍钢股份有限公司 | Wire rod for stress corrosion resistant ultra-high strength steel strand and manufacturing method of steel strand |
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| CN112391584A (en) * | 2020-11-26 | 2021-02-23 | 青岛特殊钢铁有限公司 | Heat treatment wire rod for 2060MPa bridge cable steel wire and production method thereof |
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- 2021-04-15 CN CN202110406134.3A patent/CN113186388A/en active Pending
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| CN102953005A (en) * | 2011-08-19 | 2013-03-06 | 鞍钢股份有限公司 | High-carbon low-alloy steel wire rod for producing fine steel wire and manufacturing method thereof |
| CN103468920A (en) * | 2013-08-20 | 2013-12-25 | 首钢总公司 | High-carbon steel rod on-line aging high-speed production method |
| CN106734261A (en) * | 2016-12-12 | 2017-05-31 | 中天钢铁集团有限公司 | A kind of cold technique of Stanermo wind-cooling linear control for improving spring steel 55SiCrA wire rods tissue and performance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113699360A (en) * | 2021-09-07 | 2021-11-26 | 苏闽(张家港)新型金属材料科技有限公司 | Water-bath heat treatment process for ultra-high carbon superfine steel wire |
| CN114369760A (en) * | 2022-01-07 | 2022-04-19 | 鞍钢股份有限公司 | Wire rod for stress corrosion resistant ultra-high strength steel strand and manufacturing method of steel strand |
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