CN116875904A - Steel plate for 750 MPa-grade petroleum storage tank and production method thereof - Google Patents
Steel plate for 750 MPa-grade petroleum storage tank and production method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 104
- 239000010959 steel Substances 0.000 title claims abstract description 104
- 239000003208 petroleum Substances 0.000 title claims abstract description 26
- 238000003860 storage Methods 0.000 title claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 238000005496 tempering Methods 0.000 claims abstract description 11
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 9
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 6
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 4
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 238000005096 rolling process Methods 0.000 claims description 38
- 238000009749 continuous casting Methods 0.000 claims description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 10
- 238000005266 casting Methods 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- 230000009467 reduction Effects 0.000 claims description 8
- 238000006477 desulfuration reaction Methods 0.000 claims description 6
- 230000023556 desulfurization Effects 0.000 claims description 6
- 238000007670 refining Methods 0.000 claims description 6
- 238000009489 vacuum treatment Methods 0.000 claims description 6
- 238000003723 Smelting Methods 0.000 claims description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- 238000011946 reduction process Methods 0.000 claims description 2
- 238000010079 rubber tapping Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 239000011593 sulfur Substances 0.000 claims description 2
- 238000003466 welding Methods 0.000 abstract description 18
- 238000005728 strengthening Methods 0.000 abstract description 9
- 238000005204 segregation Methods 0.000 abstract description 6
- 239000013078 crystal Substances 0.000 abstract description 4
- 238000001556 precipitation Methods 0.000 abstract description 4
- 229910045601 alloy Inorganic materials 0.000 abstract description 3
- 239000000956 alloy Substances 0.000 abstract description 3
- 229910052758 niobium Inorganic materials 0.000 abstract description 3
- 229910001566 austenite Inorganic materials 0.000 description 6
- 239000010936 titanium Substances 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000001953 recrystallisation Methods 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000000845 anti-microbial effect Effects 0.000 description 2
- 239000004599 antimicrobial Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 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 description 1
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 description 1
- 102000005298 Iron-Sulfur Proteins Human genes 0.000 description 1
- 108010081409 Iron-Sulfur Proteins Proteins 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005504 petroleum refining Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
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
-
- 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
- C21D1/34—Methods of heating
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- 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
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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 Steel (AREA)
Abstract
The invention discloses a steel plate for a 750 MPa-grade petroleum storage tank and a production method thereof, belonging to the technical field of steel preparation. The steel plate comprises the following chemical components in percentage by weight: 0.1 to 0.16 percent of C, 0.08 to 0.10 percent of Si, 0.6 to 0.8 percent of Mn, less than or equal to 0.003 percent of P, less than or equal to 0.001 percent of S and Mo:0.03% -0.045%, nb:0.035 to 0.045 percent, ti:0.06 to 0.075 percent, 0.01 to 0.02 percent of V, cu:0.01 to 0.06 percent, als is 0.002 to 0.03 percent, and the balance is Fe and unavoidable impurities. According to the invention, the content of C, mn in the steel is reasonably controlled, so that the segregation degree of the steel plate is ensured to be light; meanwhile, in order to ensure that the steel plate has good toughness, alloy elements Nb, V, ti, mo are added into the steel, crystal grains are thinned, and the steel plate is ensured to have good comprehensive performance after tempering and simulated post-welding heat treatment through precipitation strengthening.
Description
Technical Field
The invention belongs to the technical field of steel preparation, and particularly relates to a steel plate for a 750 MPa-grade petroleum storage tank and a production method thereof, which are particularly suitable for containers for natural gas and crude oil transportation, petroleum refining and storage.
Background
The petroleum strategic reserve is a main way for guaranteeing the safety of petroleum, can maintain the national economy and stability, and ensures the economic safety. Since 2004, countries began to differentiate three-phase petroleum reserve bases in coastal areas, large and ultra-large petroleum storage tanks were built for petroleum reserve, and the large storage tanks were made of steel as an important component, and their status was not negligible. The steel for the large storage tank needs to ensure that the base metal steel plate has high purity, high strength, high toughness and good welding performance, and meets the requirement of low welding crack sensitivity.
The invention patent CN202110836848.8 (steel plate for an antimicrobial corrosion-resistant petroleum storage tank and a manufacturing method thereof) discloses a steel plate for an antimicrobial corrosion-resistant petroleum storage tank and a manufacturing method thereof, wherein the steel plate comprises the following components in percentage by mass: 0.03 to 0.10 percent, si:0.1 to 0.5 percent of Mn:0.80 to 1.40 percent, P: less than 0.02%, S: less than 0.003%, cu:0.10 to 1.0 percent, cr:0.3 to 1 percent of Ni:0.2 to 1.3 percent of Mo:0.05 to 0.4 percent of Ti:0.01 to 0.05 percent, V:0.02% -0.06%, RE:0.05 to 0.1 percent, and the balance of Fe and unavoidable impurity elements. The rare earth RE is added into the steel plate, so that the production cost of the steel plate is high, and only the production of the steel plate with the thickness of 20mm is researched, so that the steel plate is not suitable for large-scale full-series wide application.
In view of the above, there is a need to develop a large-scale steel sheet for liquefied petroleum storage which has excellent comprehensive properties, strength and toughness superior to those of conventional steels, and welding properties similar to or even superior to those of conventional steels, and which is low in cost.
Disclosure of Invention
In view of the above, the invention aims to provide a high-strength high-toughness low-crack-sensitivity steel plate for petroleum storage tanks with good comprehensive properties and a production method thereof.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention provides a steel plate for a 750 MPa-level petroleum storage tank, which comprises the following chemical components in percentage by weight: 0.1 to 0.16 percent of C, 0.08 to 0.10 percent of Si, 0.6 to 0.8 percent of Mn, less than or equal to 0.003 percent of P, less than or equal to 0.001 percent of S and Mo:0.03% -0.045%, nb:0.035 to 0.045 percent, ti:0.06 to 0.075 percent, 0.01 to 0.02 percent of V, cu:0.01 to 0.06 percent, als is 0.002 to 0.03 percent, and the balance is Fe and unavoidable impurities.
The action mechanism of the chemical elements is as follows:
c: carbide is often formed with other alloy elements in steel to play a role in strengthening, so that the strength of the steel plate is ensured to be maintained at a higher level, but the higher C content is easy to generate segregation in the steel, so that the toughness and plasticity of the steel plate are obviously reduced, the low welding crack sensitivity of the steel plate is not guaranteed, and the invention adopts TiC refined grains to solve the problem. Therefore, on the premise of ensuring the strength of the steel plate, the content of C is controlled to be 0.1-0.16%.
Si: the steel has deoxidization and desulfurization effects, the strength of the steel plate can be improved through solid solution strengthening, the purchase cost of Si is low, and the proper content of Si is added into the steel, so that the hardness and strength of ferrite in the steel can be ensured to be at a higher level, and the local corrosion resistance of the steel plate can be improved. However, if the Si content is high, the low-temperature impact absorption work in the heat affected zone of the steel sheet is reduced, so that the Si content in the steel is not preferably more than 0.1%, and therefore the Si content is limited to 0.08% to 0.10%.
Mn: the element is a common desulfurizing agent in steel, mn and S are easy to form sulfide inclusions, too high content of Mn is easy to segregate to generate a hard paper phase, the welding performance of the steel plate is reduced, and the welding crack sensitivity of the steel plate is improved. In consideration of factors such as ensuring strength and toughness of the steel plate and welding performance, the Mn content is set to be in the range of 0.6-0.8% in the process of component design.
P, S is an embrittling element in steel and is also an extremely segregation element, so that the lower the content is, the better the content is, and the lower the low-temperature toughness of the steel is also greatly damaged, but the content of P, S is respectively controlled to be less than 0.003% and less than 0.001% in consideration of factors such as steelmaking operability, steelmaking cost, and satisfaction of use requirements.
Mo: is a weak solid solution strengthening element, can refine the structure in steel, strengthen the steel plate and has good influence on impact toughness and brittleness transformation temperature. However, mo is not favorable to the welding performance of the steel sheet and the purchase cost is high. Therefore, the content of Mo is controlled to be 0.03-0.045% in the invention.
Nb: as an important element of the steel plate, the effect on refining grains is obvious, the NbC is easy to combine with C, the formed NbC can prevent recovery and recrystallization of deformed austenite in the hot rolling process, the deformed austenite structure rolled in a non-recrystallized region is promoted to be converted into a tiny phase-change product in phase change, and the strength and toughness of the steel plate are positively influenced. Therefore, the Nb content is set to be 0.035 to 0.045 percent
Ti: as an important element of the steel plate, the steel plate is a strong carbonitride forming element, so that stable titanium carbide is formed and is difficult to dissolve when being heated, the expansion of grain boundaries can be effectively inhibited, the austenite grain size is reduced, the nucleation rate of ferrite is improved, and the overheating probability of the steel plate during heat treatment is reduced. Secondly, ti and C are easy to form stable TiC, the purpose of solidifying C is achieved, the reaction with free C and H in steel is reduced, the generation of harmful substances such as methane is reduced, and the decarburization, swelling and cracking tendency of the steel plate are reduced. TiC particles can be separated out in an austenite region in the heating process, and can inhibit austenite recrystallization and prevent the growth of austenite grains. In addition, researches show that excessive Ti can cause abnormal growth of crystal grains, which is unfavorable for the low-temperature toughness and welding performance of the steel plate, so that the content of Ti is controlled within the range of 0.06% -0.075%.
V is similar to Ti in action, and is combined with Nb and Ti elements to be combined with C in steel, thereby playing roles of precipitation strengthening and fine-grain strengthening precipitation strengthening, being beneficial to ensuring the toughness and welding performance of the steel plate, but excessive V can cause the mixed crystal phenomenon of the steel plate. Therefore, the V content is set to be 0.01 to 0.02 percent
Cu: the strength of the steel is improved through solid solution strengthening effect in the steel, meanwhile, the hardenability of the steel plate is ensured, but excessive Cu is unfavorable for the welding performance of the steel plate, so the Cu content is limited to be 0.01-0.06%.
Als: as deoxidizing element in steel, the steel can effectively refine grains, and the content is more proper in 0.002% -0.03%.
Based on the technical scheme, further, the thickness of the steel plate is 80-100 mm, the tensile strength is 750-850 MPa, the yield strength is 550-650 MPa, the elongation after fracture is 20-25%, and the impact energy at minus 20 ℃ is 200-250J; mechanical properties of the die-welded state: the tensile strength is 730-760 MPa, the yield strength is 550-600 MPa, the elongation after break is 25-30%, and the impact energy at minus 20 ℃ is 210-280J.
The invention also provides a production method of the steel plate for the 750 MPa-grade petroleum storage tank, which mainly comprises the following steps:
(1) Heating a continuous casting blank: the heating temperature of the continuous casting blank is 1170-1250 ℃, the soaking time is 2-4 hours, when the heating temperature is lower than 1170 ℃, the primary precipitate in the continuous casting blank is incompletely dissolved, the austenitizing process is influenced, and the initial rolling and final rolling temperatures of rough rolling cannot be effectively achieved; and adversely affects the grain size of the steel sheet;
(2) Rolling of continuous casting billets: the initial rolling temperature of rough rolling is more than or equal to 1060 ℃, the single pass rolling reduction is 6-9%, and the rapid rolling is carried out by adopting large deformation at the stage, so that the dynamic recrystallization process of the near surface of the steel plate is ensured to be complete; the initial rolling temperature of the finish rolling is more than or equal to 1000 ℃, the final rolling temperature is more than or equal to 820 ℃, the single-pass reduction rate is 3-5%, and the small deformation is adopted for rapid rolling at the stage, so that no recrystallization occurs on the near surface of the steel plate;
(3) Tempering: the tempering temperature is controlled at 600-650 ℃ and the furnace time is 2-4 h.
Based on the technical scheme, the heating temperature of the continuous casting billet in the step (1) is 1170-1220 ℃.
Based on the technical scheme, further, the rough rolling start temperature is 1060-1170 ℃ and the finish rolling temperature is 1040-1060 ℃ in the step (2); the initial rolling temperature of the finish rolling is 1000-1020 ℃, and the final rolling temperature is 820-840 ℃.
Based on the technical scheme, further, the tempering temperature in the step (3) is controlled to be 620-630 ℃.
Based on the technical scheme, further, the preparation of the continuous casting billet in the step (1) comprises the following steps:
molten iron pretreatment, converter smelting, LF furnace refining, RH vacuum treatment and continuous casting;
wherein, the casting temperature of molten steel in the continuous casting process is less than or equal to 1540 ℃ so as to refine the original cast structure, and in order to reduce the occurrence probability of center segregation and looseness of a continuous casting billet, an electromagnetic stirring or continuous casting billet soft reduction process is adopted, and the casting billet soft reduction rate is controlled to be 5-7%.
Based on the technical scheme, further, the casting temperature of the molten steel is 1530-1540 ℃.
Based on the technical scheme, further, the pretreatment of the molten iron comprises desulfurization and dephosphorization, the mass fraction of the sulfur in the molten iron is reduced to below 0.003%, and the mass fraction of the phosphorus is reduced to below 0.001%.
Based on the technical scheme, further, refining and adjusting components by adopting an LF furnace, performing deep desulfurization treatment, performing RH vacuum treatment, and further adjusting the components; the RH vacuum treatment is degassing (nitrogen, hydrogen, oxygen and the like) so that inclusions (sulfides, oxides, silicate and the like) in molten steel fully float up, thereby fundamentally ensuring an effective way of purity of steel and being an effective way of microalloying the steel.
Based on the technical scheme, further, slag blocking balls are added to block slag during converter smelting tapping.
Based on the technical scheme, the simulated welding heat treatment temperature of the steel plate is 570-590 ℃, and the net heat preservation time is 2-4 hours.
Compared with the prior art, the invention has the following beneficial effects:
1. in order to ensure the high purity, high strength, high toughness and good welding performance of the steel plate and meet the requirement of low welding crack sensitivity, the invention ensures the lighter segregation degree of the steel plate by reasonably controlling the C, mn content in the steel; meanwhile, in order to ensure that the steel plate has good toughness, alloy elements Nb, V, ti, mo are added into the steel, crystal grains are thinned, and the steel plate is ensured to have good comprehensive performance after tempering and simulated post-welding heat treatment through precipitation strengthening.
2. The invention adopts a heat treatment mode of staged rolling and tempering to ensure that the finished steel plate has uniform grain size and high strength in the whole thickness direction and good welding performance, and meets the requirement of low welding crack sensitivity.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings to which the embodiments relate will be briefly described.
FIG. 1 shows the metallographic structure of a steel sheet prepared in the example.
Detailed Description
The following detailed description of the invention is provided in connection with examples, but the implementation of the invention is not limited thereto, and it is obvious that the examples described below are only some examples of the invention, and that it is within the scope of protection of the invention to those skilled in the art to obtain other similar examples without inventive faculty.
Examples 1 to 6
The embodiment provides a steel plate for a 750 MPa-grade petroleum storage tank, wherein the thickness, chemical components and weight percentages of the steel plate are shown in Table 1;
TABLE 1 chemical composition (wt%) of Petroleum tank Steel plates of examples 1-6
The production method comprises the following steps:
molten iron pretreatment, converter smelting, LF furnace refining, RH vacuum treatment, continuous casting, heating, rolling, tempering, trimming, checking and inspecting;
wherein the pretreatment of molten iron comprises desulfurization and dephosphorization, the mass fraction of molten iron sulfur is reduced to below 0.003%, and the mass fraction of phosphorus is reduced to below 0.001%;
refining and adjusting components by an LF furnace, performing deep desulfurization treatment, and performing RH vacuum treatment and further adjusting the components;
parameters of molten steel casting temperature and casting blank soft reduction rate in the continuous casting process are shown in table 2;
the heating temperature and soaking time of the continuous casting billet in the heating process are shown in table 2,
the rolling of the continuous casting blank adopts a two-stage rolling control process, wherein the initial rolling temperature, the final rolling temperature, the single-pass rolling reduction rate of rough rolling are shown in table 2.
Table 2 continuous casting and Rolling Process parameters of Petroleum tank Steel plates of examples 1-6
The rolled steel sheet is tempered, the tempering temperature, the heating rate and the furnace time are shown in table 3, and the simulated post-weld heat treatment temperature and the net heat preservation time are shown in table 3.
Table 3 heat treatment process parameters of the petroleum tank steel sheets of examples 1 to 6
The mechanical properties of the steel plate for the 750 MPa-level petroleum storage tank are shown in Table 4, the mechanical properties of the die-welded state are shown in Table 5, the grain size and nonmetallic inclusion test results are shown in Table 6, the structure of the steel plate is tempered sorbite, and the steel has uniform structure and lower segregation.
TABLE 4 mechanical Properties of Petroleum tank Steel plates of examples 1-6
TABLE 5 mechanical Properties of Petroleum tank Steel plates in die-welded State of examples 1-6
TABLE 6 grain size and nonmetallic inclusion test results of Petroleum tank Steel plates of examples 1-6
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. The steel plate for the 750 MPa-grade petroleum storage tank is characterized by comprising the following chemical components in percentage by weight: 0.1 to 0.16 percent of C, 0.08 to 0.10 percent of Si, 0.6 to 0.8 percent of Mn, less than or equal to 0.003 percent of P, less than or equal to 0.001 percent of S and Mo:0.03% -0.045%, nb:0.035 to 0.045 percent, ti:0.06 to 0.075 percent, 0.01 to 0.02 percent of V, cu:0.01 to 0.06 percent, als is 0.002 to 0.03 percent, and the balance is Fe and unavoidable impurities.
2. The steel sheet for 750MPa grade petroleum storage tank according to claim 1, wherein the thickness of the steel sheet is 80-100 mm, the tensile strength is 750-850 MPa, the yield strength is 550-650 MPa, the elongation after break is 20% -25%, and the impact energy at-20 ℃ is 200-250J; mechanical properties of the die-welded state: the tensile strength is 730-760 MPa, the yield strength is 550-600 MPa, the elongation after break is 25-30%, and the impact energy at minus 20 ℃ is 210-280J.
3. The production method of the steel plate for 750 MPa-grade petroleum storage tanks according to claim 1 or 2, characterized by comprising mainly the steps of:
(1) Heating a continuous casting blank: the heating temperature of the continuous casting blank is 1170-1250 ℃, and the soaking time is 2-4 hours;
(2) Rolling of continuous casting billets: the initial rolling temperature of rough rolling is more than or equal to 1060 ℃, and the single pass rolling reduction is 6-9%; the initial rolling temperature of the finish rolling is more than or equal to 1000 ℃, the final rolling temperature is more than or equal to 820 ℃, and the single pass reduction rate is 3-5%;
(3) Tempering: the tempering temperature is controlled at 600-650 ℃ and the furnace time is 2-4 h.
4. A production method according to claim 3, wherein the heating temperature of the continuous casting billet in step (1) is 1170 to 1220 ℃.
5. The production method according to claim 3, wherein the rough rolling start temperature is 1060-1170 ℃ and the finish rolling temperature is 1040-1060 ℃ in the step (2); the initial rolling temperature of the finish rolling is 1000-1020 ℃, and the final rolling temperature is 820-840 ℃.
6. A production method according to claim 3, wherein the tempering temperature in step (3) is controlled to 620 to 630 ℃.
7. A production method according to claim 3, wherein the preparation of the continuous casting slab comprises the steps of:
molten iron pretreatment, converter smelting, LF furnace refining, RH vacuum treatment and continuous casting;
wherein the casting temperature of molten steel in the continuous casting process is less than or equal to 1540 ℃, an electromagnetic stirring or continuous casting billet soft reduction process is adopted, and the casting billet soft reduction rate is controlled to be 5-7%.
8. The method according to claim 7, wherein the casting temperature of molten steel is 1530 to 1540 ℃.
9. The method according to claim 7, wherein the pretreatment of molten iron comprises desulfurization and dephosphorization, the mass fraction of sulfur in the molten iron is reduced to less than 0.003%, and the mass fraction of phosphorus is reduced to less than 0.001%.
10. The production method according to claim 7, wherein the slag-stopping balls are added to stop slag during converter smelting tapping.
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