CN108866435A - Composite microalloyed medium manganese steel for automobile and manufacturing method thereof - Google Patents
Composite microalloyed medium manganese steel for automobile and manufacturing method thereof Download PDFInfo
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- CN108866435A CN108866435A CN201810716250.3A CN201810716250A CN108866435A CN 108866435 A CN108866435 A CN 108866435A CN 201810716250 A CN201810716250 A CN 201810716250A CN 108866435 A CN108866435 A CN 108866435A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 229910000617 Mangalloy Inorganic materials 0.000 title abstract description 4
- 239000002131 composite material Substances 0.000 title abstract 2
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 53
- 239000010959 steel Substances 0.000 claims abstract description 53
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 13
- 238000005097 cold rolling Methods 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 10
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 9
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 9
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 9
- 238000000137 annealing Methods 0.000 claims abstract description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 8
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 7
- 229910052802 copper Inorganic materials 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 238000005496 tempering Methods 0.000 claims abstract description 3
- 238000005516 engineering process Methods 0.000 claims description 8
- 238000005098 hot rolling Methods 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- 239000004615 ingredient Substances 0.000 claims description 6
- 229910000859 α-Fe Inorganic materials 0.000 claims description 6
- 238000012797 qualification Methods 0.000 claims description 2
- 239000011572 manganese Substances 0.000 abstract description 13
- 238000005096 rolling process Methods 0.000 abstract description 4
- 229910045601 alloy Inorganic materials 0.000 abstract description 2
- 239000000956 alloy Substances 0.000 abstract description 2
- 229910052799 carbon Inorganic materials 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 11
- 239000010936 titanium Substances 0.000 description 10
- 239000010955 niobium Substances 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 6
- 229910001566 austenite Inorganic materials 0.000 description 6
- 239000013078 crystal Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000010949 copper Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 229910052750 molybdenum Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 229910001567 cementite Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 241000251131 Sphyrna Species 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005713 exacerbation Effects 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- CADICXFYUNYKGD-UHFFFAOYSA-N sulfanylidenemanganese Chemical compound [Mn]=S CADICXFYUNYKGD-UHFFFAOYSA-N 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 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
- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold 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
- 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
- C21D8/0273—Final recrystallisation annealing
-
- 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
-
- 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
- C21D2211/001—Austenite
-
- 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
- C21D2211/005—Ferrite
Landscapes
- 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 Sheet Steel (AREA)
Abstract
The invention discloses composite microalloyed medium manganese steel for an automobile and a manufacturing method thereof. The steel contains C: 0.1% -0.4%, Si: 0.2% -0.8%, Cu: 0.4-0.8%, Mn: 4.0% -6.0%, Al: 2.5% -4.5%, Ti: 0.015% -0.030%, Nb: 0.02% -0.06%, V: 0.04-0.08 percent of the total weight of the alloy, less than 0.020 percent of P, less than 0.006 percent of S and the balance of Fe and inevitable impurities. Heating the billet to 1150 +/-50 ℃, and preserving heat for 4 +/-0.5 h; the final rolling inlet temperature is 700 +/-10 ℃, the final rolling outlet temperature is 680 +/-10 ℃, and the coiling temperature is 580-650 ℃; the cold rolling reduction rate is not lower than 70 percent; annealing at 760-860 deg.C for 5 + -0.5 min, cooling to 100-150 deg.C at cooling rate of 10-30 deg.C/s, tempering at 500-600 deg.C for 3 + -0.5 min at cooling rate of 5-20 deg.C/s, and cooling to room temperature. The produced steel for automobile structures has high strength and excellent longitudinal elongation.
Description
Technical field
The invention belongs to metal material fields, are related specifically to a kind of for manufacturing the combined microalloying of automobile structure
Medium managese steel and its manufacturing method.
Background technique
Since Construction Technologies in Twenty-one Century, as energy crisis and environmental issue become increasingly conspicuous, automobile industry is towards lightweight, low
The trend development of pollution, thus high intensity, lighting, good mouldability, weatherability, solderability have become automobile structure
The main R&D direction of steel.Medium managese steel is with its unique performance, moderate cost and in automobile structural steel using upper great latent
Power is increasingly paid attention to by each steel manufacturer, carries out going deep into research and development.
CN200810119820.7 discloses a kind of wear-resisting medium managese steel hot rolled plate of obdurability and its manufacturing method, feature exist
It is in the chemical component mass percentage of medium managese steel hot rolled plate：C：0.8%~1.2%, Si≤0.8%, Mn：7.0%~
8.5%, P≤0.030%, S≤0.005%, Cr：1.2%~1.8%, Mo：0.2%~0.5%, V：0.2%~0.5%, Nb
≤ 0.1%, Ti≤0.05%, Al≤0.04%, B≤0.003%, remaining is Fe and inevitable residual impurities element.Its
Carbon content is high and is added to the Al of Mo element and lower content, higher cost and without lighting feature.
CN103695765A discloses a kind of high-strength and high-plasticity cold rolling medium managese steel and preparation method thereof.Its ingredient is by weight
Percentage is containing C：0.18%, Mn：10.62%, A1：4.06%, Nb：0.025%, surplus is Fe and impurity.The design of its ingredient
Manganese content is higher and takes single microalloying, and production difficulty is big, microalloying effect is also restrained.
CN201310555814.7 discloses a kind of high rigidity medium-manganese steel hammerhead material and preparation method thereof.Its chemical element at
Divide and is by mass percentage：Carbon 0.2%~0.5%, silicon 0.1%~0.3%, manganese 5.3%~5.5%, molybdenum 3.0%~3.2%,
Titanium 1.7%~1.9%, chromium 0.5%~0.7%, cerium 0.2%~0.4%, yttrium 0.05%~0.07%, Hf 0.08%~
0.12%, Bi 0.12%~0.15%, La 0.02%~0.04%, S≤0.05%, P≤0.05%, surplus are iron.Alloy
Constituent content is high and has expensive rare earth element and molybdenum, is not suitable for the production of vehicle structure steel plate.
CN201610917743.4 discloses a kind of manganese steel containing aluminium, and chemical component is C 1.30%~1.40%, Mn
15.5%~17.5%, Si 0.40%~0.80%, Cr≤0.30%, Ni≤1.00%, Mo≤0.50%, S≤0.03%, P
≤ 0.05%, Al 1.80%~2.20%, surplus Fe.The steel manganese, carbon content are high, no microalloy element addition.
CN104694816A discloses a kind of preparation method of high Al medium managese steel of the strength and ductility product greater than 30GPa%.Chemistry
Ingredient percent is：0.10%~0.35%C, 5.0%~9.0%Mn, 4.0%~7.5%Al, P<0.003%, S<
0.002%, surplus is Fe and inevitable impurity.Micro-alloying technology is not used.
Summary of the invention
It is an object of the invention to be directed to the growth requirement in automobile steel field, a kind of automobile combined microalloying is provided
Medium managese steel and its manufacturing method.On basic medium managese steel component base, optimizing components are carried out, while adding Nb, V, Ti, Cu member
Element obtains tensile strength and is greater than 980MPa, elongation percentage is greater than 30% by conventional medium managese steel annealing process.
Specifically technical solution is：
A kind of automobile combined microalloying medium managese steel, chemical component are by weight percent：C：0.1%~0.4%,
Si：0.2%~0.8%, Cu：0.4%~0.8%, Mn：4.0%~6.0%, Al：2.5%~4.5%, Ti：0.015%~
0.030%, Nb：0.02%~0.06%, V：0.04%~0.08%, P<0.020%, S<0.006%, surplus is Fe and can not
The impurity avoided.
The main function of each element is in light plate of the present invention：
C：Carbon is most important solution strengthening and stable austenite element in steel, and a certain amount of solid solution carbon could proof strength
And suitable microscopic structure.Carbon content is excessively high, unfavorable in the molding of steel plate and weldability.Carbon content is too low, then is difficult to ensure steel
Intensity and the suitable microscopic structure of control.The scope control of carbon is 0.1%~0.4% in the present invention.
Si：Silicon is solution strengthening element, and the intensity of steel plate can be improved and increase activity of the carbon in steel, inhibits cementite
It is formed, conducive to diffusion and partition of the carbon in steel, but it is excessively high, reduce the plasticity of steel.Silicon excessively high simultaneously can deteriorate hot rolled steel plate
Surface quality.The content control of silicon is 0.2%~0.8% in the present invention.
Cu：Expand austenite phase field, the solderability for improving weatherability, improving steel is precipitated in voxel volume and improves the strong of steel
Degree, but too high levels cause hot-short, and content is too low, cannot play its beneficial effect, the optimized scope of copper content exists in the present invention
0.4%~0.8%.
Mn：Manganese is to play solution strengthening and expansion austenite phase field, stable austenite.But manganese content is excessively high will form it is single
Austenite structure is not achieved required degree and increases manufacture difficulty, too low, cannot obtain required duplex structure.In the present invention
The content of manganese is 4.0%~6.0%.
Al：Aluminium, which can be formed, inhibits cementite to be precipitated, and the nitrogen in fixed steel plays the role of certain refinement crystal grain, and
The density of steel can be reduced.But it is excessive then easily form delta ferrite, reduce the plasticity of steel, the range of aluminium of the present invention is 2.5%~
4.5%.
Ti：Carbon and nitrogen, which combine, forms small carbonitride, can refine crystal grain, improve intensity, improve the weldability of steel
Energy.It is excessively high, the plasticity that coarse TiN deteriorates steel easily is precipitated in high temperature, it is too low, it cannot be precipitated, the model of Ti content in the present invention
It is trapped among 0.015%~0.030%.
Nb：Carbonitride can be formed, strong inhibition austenite recrystallization and refine crystal grain, and have the work of precipitation strength
With, it is too low, it cannot be precipitated, niobium is limited in 0.02%~0.06% by the present invention.
V：It is the best precipitation strength element of ferrite, and crystal grain can be refined to a certain extent.By content of vanadium in the present invention
Scope control 0.04%~0.08%.
P：Phosphorus is although can be improved the intensity of steel plate, the cold forming especially post forming performance of meeting severe exacerbation steel,
Therefore the present invention controls its content in P<0.020%.
S：Sulphur makes harmful element in steel, and will form manganese sulfide reduces the performance of steel plate, and forming compound with titanium reduces titanium
Beneficial effect.Therefore the fewer content the better, controls its content in S in the present invention<0.006%.
The present invention uses the above chemical component, by smelting, continuous casting, slab heating, hot rolling, cold rolling, annealing operation, obtains
With a thickness of the automobile combined microalloying medium managese steel of 0.5~2.0mm, specific manufacturing method includes the following steps：
(1) heating process：The steel billet of ingredient qualification is heated to 1150 ± 50 DEG C in heating furnace, and it is small to keep the temperature 4 ± 0.5
When.Be dissolved alloying element sufficiently, ingredient it is uniform.
(2) hot rolling technology：Through section cooling, guarantee that finish to gauge inlet temperature is 700 ± 30 DEG C, finish to gauge outlet temperature is 680
± 30 DEG C, guarantees that coiling temperature is 580~650 DEG C, keep Nb, V, Ti Carbonitride Precipitation abundant, coiling temperature is excessively high to be caused to analyse
Mutually it is roughened out, it is unfavorable in intensity；It is too low, it causes precipitated phase meticulous, is easy to generate mixed crystal after cold rolled annealed.Under hot rolling technology
The tissue that steel plate obtains is ferrite+austenitic duplex tissue.
(3) cold-rolling process：Cold rolling reduction ratio is not less than 70%.
(4) it is heat-treated：Annealing temperature is 760~860 DEG C, keeps the temperature 5 ± 0.5 minutes, cold with 10~30 DEG C/s of cooling velocity
But to 100~150 DEG C, 500~600 DEG C of tempering is again heated to, isothermal 3 ± 0.5 minutes, are cooled to 5~20 DEG C/s of cooling velocity
Room temperature.
Beneficial effect：
The present invention compared with the existing technology, has the beneficial effect that：
(1) the compound addition of Nb, V, Ti, Cu significantly refine crystal grain, improve the intensity of steel plate, and effect, which is much larger than, individually to be added
Add；
(2) it is produced by two-phase section hot rolling technology of the invention, the ferrite+austenitic duplex group obtained under hot rolling technology
It knits, guarantee hot rolled plate is without intermediate annealing direct cold rolling, and manganese has been realized in dynamic partition in hot rolling, shortens cold rolling and moves back
The fiery time；
(3) there is excellent comprehensive performance by steel plate produced by the invention：Tensile strength is greater than 980MPa, and elongation percentage is greater than
30%.
Detailed description of the invention
Fig. 1 is the metallographic microstructure of 1 hot rolled steel plate of embodiment, wherein tissue is ferrite, austenitic duplex tissue；
Specific embodiment
For following embodiment for illustrating the content of present invention, these embodiments are only the general description of the content of present invention,
The content of present invention is not limited.
Will be with a thickness of cold rolling after 4.5mm hot rolled plate pickling, the chemical component of various embodiments of the present invention steel is as shown in table 1；This
Rolling and the annealing process for inventing each embodiment steel are as shown in table 2；The mechanical property of various embodiments of the present invention steel is as shown in table 3.
The chemical component (wt, %) of 1 embodiment of the present invention of table
The rolling of 2 embodiment of the present invention of table and annealing process
The mechanical property of 3 embodiment of the present invention of table
From above embodiments it is found that by the automobile structural steel that the method for the present invention produces, steel plate has high intensity, and (tension is strong
Degree >=980MPa), excellent longitudinal elongation percentage (A >=30%).
Claims (2)
1. a kind of automobile combined microalloying medium managese steel, which is characterized in that chemical component is by mass percentage in steel：C：
0.1%~0.4%, Si：0.2%~0.8%, Cu：0.4%~0.8%, Mn：4.0%~6.0%, Al：2.5%~4.5%,
Ti：0.015%~0.030%, Nb：0.02%~0.06%, V：0.04%~0.08%, P<0.020%, S<0.006%,
Remaining is Fe and inevitable impurity.
2. a kind of manufacturing method of automobile combined microalloying medium managese steel as described in claim 1, the production technology of steel plate
For：Smelting-continuous casting-heating-hot rolling-cold rolling-heat treatment, which is characterized in that
(1) it heats：The steel billet of ingredient qualification is heated to 1150 ± 50 DEG C in heating furnace, and keeps the temperature 4 ± 0.5 hours；
(2) hot rolling：Through section cooling, finish to gauge inlet temperature is 700 ± 30 DEG C, and finish to gauge outlet temperature is 680 ± 30 DEG C, batches temperature
Degree is 580~650 DEG C, and hot rolled steel plate tissue is ferrite and austenitic duplex tissue；
(3) cold rolling：Cold rolling reduction ratio is not less than 70%；
(4) it is heat-treated：Annealing temperature is 760~860 DEG C, keeps the temperature 5 ± 0.5 minutes, is cooled to 10~30 DEG C/s of cooling velocity
100~150 DEG C, 500~600 DEG C of tempering are again heated to, isothermal 3 ± 0.5 minutes, room temperature is cooled to 5~20 DEG C/s of cooling velocity.
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