CN104630641B - 800MPa-grade high-strength high-plasticity low-carbon medium-manganese steel and manufacturing method thereof - Google Patents
800MPa-grade high-strength high-plasticity low-carbon medium-manganese steel and manufacturing method thereof Download PDFInfo
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Abstract
The invention provides 800MPa-grade high-strength high-plasticity low-carbon medium-manganese steel. The low-carbon medium-manganese steel comprises the following chemical components in percentage by mass: 0.05-0.25% of C, 0.02-0.40% of Si, 3.0-7.0% of Mn, less than or equal to 0.015% of P, less than or equal to 0.015% of S, 1.50-3.5% of Al, 0.02-0.60% of Cr, less than or equal to 0.50% of Cu, less than or equal to 0.40% of Mo, less than or equal to 0.10% Nb, less than or equal to 0.010% of N and the balance of Fe and unavoidable impurities. A manufacturing method of the low-carbon medium-manganese steel comprises the following steps of smelting, continuous casting, hot continuous rolling, batch annealing, pickling, cold rolling, batch annealing or continuous annealing and finishing packaging. The 800MPa-grade high-strength high-plasticity low-carbon aluminum-containing medium-manganese steel has the advantages of high strength, good cold pressing forming property and impact energy-absorption property.
Description
Technical field
The invention belongs to high-strength steel production technical field, refer specifically to a kind of 800MPa grade high-strength high-plasticity low-carbon medium managese steel
And its manufacture method.
Background technology
The developing direction of automobile is lightweight, reduces fuel consumption, reduces discharge and improve safety, future automobile steel
Iron material should be the Iron ＆ Steel Material of New Generation with intensity and plasticity good combination, reach the light weight of automobile by high strengthening
Change, meanwhile, need forming property and collision safety performance to improve steel for the higher plasticity.The high strength and ductility of automobilesheet steel
(product of tensile strength and percentage elongation) demand has driven the development developed with application of superhigh intensity, high-ductility steel.The first generation
Automobile high-strength steel includes high-strength IF steel, DP steel, CP steel, TRIP steel, QP steel and hot forming martensite steel, and its organizational structure is
With ferrite as matrix, containing a small amount of or partial martensite, bainite hardening phase, it is substantially free of or contains a small amount of residual austenite
Body.The common characteristic of these steel grades is to possess excellent intensity index or plasticity index, but can not two get both, its strength and ductility product exists
Level between 10～20GPa%.Second filial generation automobile steel is to be with the TWIP steel of fully austenitic structure and austenitic stainless steel
Represent, its strength and ductility product reaches the level of 50～70GPa%, there is very high crash absorption capacity and good molding energy
Power.But which are added the alloying elements such as substantial amounts of Cr, Ni, Mn, sum total gold content up to more than 25%, particularly high Mn content,
Result in smelting process poor-performing, metallurgical industry production difficulty is larger.At present, the automobile high-strength steel of batch application can only have
A characteristic in standby high intensity and high-ductility, and have high-ductility concurrently, the TWIP steel of high-strength characteristic is difficult in adapt to low cost
Require.
Before the present invention, Application No. 200910063337.6, entitled " 700MPa level high-strength cold rolling carbon-aluminum-manganese steel plate and
The patent of invention of its manufacture method ", discloses a kind of 700MPa level high-strength cold rolling carbon-aluminum-manganese steel plate and its manufacture method, this steel plate
The percentage by weight of each component is：C：0.18～0.23%；Al：1.20～1.50%；Mn：1.50～1.80%, Si≤
0.50%, P≤0.040%, S≤0.005%, balance of Fe and inevitable impurity.This technical scheme belongs to containing aluminum, low manganese
TRIP steel making technology, strengthens the mechanism of stabilization of austenite, Al control of element bainite transformation, using double using C, Mn element
Phase region Technology for Heating Processing to obtain ferrite+bainite+metastable austenite heterogeneous structure, its armor plate strength rank, plasticity index
Belong to typical TRIP Steel Properties category, level between 10～20GPa% for the strength and ductility product.
Application No. 200910091129.7, entitled " a kind of automobile steel with low cost and high strength ductility balance and preparation method thereof "
Patent of invention, disclose a kind of based on reasonable Design of Chemical Composition control the solutes such as martensitic phase transformation, C/Mn again partition and
Austenite reverse transformation is to obtain multiphase, metastable and multiple dimensioned M3Type organizational structure, the percentage by weight of its chemical composition is：C：
0.01～0.50%；Mn：3.50～9.0%, P≤0.020%, S≤0.02%, the base of balance of Fe and inevitable impurity
One or more element, wherein Al are separately added on plinth：0.015～0.06%, Si：0.3～2.3%.Its result of the test is experiment
Number of chambers evidence, and Technology for Heating Processing flow process is numerous and diverse, be not suitable for industrial mass manufacture application.
Content of the invention
800MPa grade high-strength high-plasticity low-carbon medium managese steel of the present invention, its chemical composition is by mass percentage：C：
0.05～0.25%, Si：0.02～0.40%, Mn：3.0～7.0%, P≤0.015%, S≤0.015%, Al：1.50～
3.5%, Cr：0.02～0.60%, Cu≤0.50%, Mo≤0.40%, Nb≤0.10%, N≤0.010%, balance of Fe and
Inevitably impurity.
The manufacture method of described 800MPa grade high-strength high-plasticity low-carbon medium managese steel, including：Smelting, continuous casting, hot continuous rolling,
Bell-type annealing, the step of pickling and cold-rolling rolling, bell-type annealing or continuous annealing, finishing packaging, it is characterized in that：
Described smelting process flow process is：Molten iron pre-desulfurization, converter smelting, argon station, LF ladle furnace/RH vacuum drying oven, continuous casting pour
Casting, described Tapping Temperature of Bof is 1670～1730 DEG C；Strand enters holding pit slow cooling cooling；Preferably, during smelting, alloying of manganese
It is 41 in the allocation proportion of converter smelting and external refining；
During described hot continuous rolling, strand heats through 1200～1300 DEG C, carries out 5～12 passes by roughing mill, with laggard
Mm finishing mill unit carries out 5～7 passes, and finishing temperature is 830～910 DEG C, 400～600 DEG C of coiling temperature, after hot rolled coil curling
Carry out air-cooled cooling using blower fan；
Described cover annealing temperature is 680～720 DEG C, the annealing soak time is 10～12h；
Control the total HCl of pickle concentration in the range of 75～150g/l in described pickling and cold-rolling rolling；Cold rolling stagnation pressure
Lower rate controls in 50～65% intervals.
Preferably, described continuous annealing furnace annealing temperature be 720～750 DEG C, soaking time 3～5min, smooth elongation percentage
More than 1.0～1.2%.Subsequently, heat- treated steel volume carries out finishing process.
The component of steel of the present invention and its manufacturing approach craft parameter designing principle analysis are as follows：
It is contemplated that wherein C, Mn element is austenite former during steel constituent design of the present invention, its content increases favorably
In the acquisition of metastable austenite, consider the factors such as test steel welding performance, steel uniformity, cost of alloy, design its matter
Amount percentage composition is respectively C：0.05～0.25%, Mn：3.0～7.0%；Si is ferrite former, has solution strengthening
Effect, great surface quality requires to limit Si upper content limit value, and design Si weight/mass percentage composition is divided into 0.02～0.40%；Al is non-
Carbide former, has the effect of suppression Carbide Precipitation, and expands the effect of Technology for Heating Processing window, is to ensure that examination
Test the key alloying elements of Steel Properties technology stability, designing quality percentage composition is 1.0～3.5%；Nb is microalloying unit
Element, is remarkably improved austenite recrystallization temperature, crystal grain thinning, and designing its weight/mass percentage composition is≤0.10%；P, S, N are steel
Middle impurity element, should control its content.
The converter installation that the industrially preparing process of steel of the present invention is generally equipped using TECHNIQUE TO LARGE INTEGRATED STEEL WORKS, smelts and belongs to
The medium managese steel of steel alloy category, rationally carries out alloying using preheating manganese alloy in converter tapping process, successfully solves high conjunction
The technological difficulties of aurification temperature drop restricting tapping temperature.Meanwhile, entered using progressively alloying mode during external refining
Row manganese, aluminium alloying.According to theory analysis and produce reality experience, when preferably smelting, alloying of manganese is in the outer essence of converter smelting and stove
The allocation proportion of refining is 41, because steel alloy content of the present invention belongs to medium alloy steel category, necessarily leads to greatly because alloy adds
The temperature drop of amount, carries out alloying using converter smelting it is impossible to ensure that alloying process completes merely, therefore novelty adopts converter smelting
It is considered to technological feasibility and steel cleanliness, optimal allocation ratio is 4 to the technical tactic of refining and external refining substep alloying
1.Now, if ratio is more than 41, alloying rear converter temperature drop is excessive, leads to tapping difficult；If ratio is less than 41, i.e. the outer essence of stove
The alloy of excessive addition during refining, necessarily increases the external refining time, Cleanliness of Molten Steel reduces.Tapping Temperature of Bof >=1670
DEG C, argon station adopts low blow moulding to process, and continuous casting adopts mould flux using argon envelope protective casting, crystallizer, and pulling rate is set to
Middle low speed is to ensure cc billet surface quality.
For high alloy content composition design feature, the present invention enters the manufacture method of holding pit slow cooling cooling using strand,
This is 800MPa grade high-strength, the industrial necessary guarantee manufacturing feasibility of high-ductility steel for critical process.During hot continuous rolling, strand warp
1200～1300 DEG C of heating, carry out 5～12 passes by roughing mill, carry out 5～7 passages with laggard 7 frame mm finishing mill unit and roll
System, finishing temperature is 830～910 DEG C, 400～600 DEG C of coiling temperature, carries out air-cooled cooling using blower fan after hot rolled coil curling；
Hot rolled coil cover annealing temperature is 680～720 DEG C, the annealing soak time is 10～12h.
Meanwhile, novelty of the present invention realizes cover annealing volume coil pickled surface quality production control technology, analyzes after testing, after cover annealing
Compared with coils of hot-rolled steel surface, there is relatively thin Fe in coil of strip surface3O4、Fe2O3(bloodstone), therefore pickling produces control and it is critical to
Point is to control the total HCl of pickle concentration in pickling and cold-rolling rolling in the range of 75～150g/l, actual according to commercial production, cold
Rolling total reduction controls in 50～65% intervals.Chill volume Design of Heat Treatment Process is that two-phase section (α+γ) is annealed, cover
Formula furnace annealing temperature is 680～720 DEG C, the annealing soak time is 10～12h, and continuous annealing furnace annealing temperature is 720～750
DEG C, soaking time 3～5min, smooth elongation percentage 1.0～1.2%.Subsequently, heat- treated steel volume carries out finishing process.
Technical solution of the present invention is based on low-cost industrial and manufactures angle and successfully develops high intensity, manganese in high-plasticity low-carbon
Steel, novelty realizes the converter smelting of medium managese steel using progressively alloying and preheating alloying process route, using controlled rolling and controlled cooling
Hot rolling technology to obtain ultrafine-grained (UFG) microstructure, improve stabilization of austenite with two using the enrichment of austenite former C, Mn
The metastable austenite of more than 30% volume fraction is obtained, finished product tensile strength is more than 800MPa, elongation percentage under phase region annealing process
It is more than 0.20, yield tensile ratio more than 35%, work hardening index n and is less than 0.75, there is good cold stamping shaped performance.
This technology has big batch trial-production feasibility, is to be refined by production experience, manufactured
800MPa grade high-strength, high-plasticity low-carbon medium managese steel containing aluminum possess high intensity, good cold stamping forming property and collision energy-absorbing
Energy.
Brief description
Fig. 1 is the skin-deep X-ray diffraction result schematic diagram of product coil of strip Surface Fe of the present invention.
Fig. 2 is product made from steel typical sample stress-strain curve diagram of the present invention.
Fig. 3 a is product made from steel ferritic structure part heterogeneous microstructure schematic diagram of the present invention.
Fig. 3 b is product made from steel martensite+metastable austenite+ferritic portion structural representation heterogeneous microstructure of the present invention
Schematic diagram.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, to 800MPa grade high-strength high-plasticity low-carbon medium managese steel of the present invention and its system
The method of making is described in further details.
Embodiment
Manufacture manganese embodiment steel in four kinds of 800MPa grade high-strength high-plasticity low-carbons respectively, its chemical composition presses percent mass
More as shown in table 1 than respectively.
Baogang's Hydrochemical Composition (balance of Fe and inevitable impurity)/wt% in table 1
| Embodiment | C | Si | Mn | P | S | Al | Cr | Cu | Mo | Nb | N |
| 1 | 0.10 | 0.28 | 5.3 | 0.02 | 0.01 | 1.6 | 0.08 | 0.2 | 0.1 | 0.1 | 0.01 |
| 2 | 0.06 | 0.20 | 6.6 | 0.03 | 0.02 | 2.0 | 0.1 | 0.4 | 0.2 | 0.08 | 0.009 |
| 3 | 0.18 | 0.18 | 4.5 | 0.02 | 0.03 | 2.4 | 0.4 | 0.5 | 0.3 | 0.09 | 0.008 |
| 4 | 0.24 | 0.10 | 3.7 | 0.04 | 0.02 | 3.3 | 0.3 | 0.1 | 0.4 | 0.1 | 0.007 |
The manufacture method of above-described embodiment 1～4 steel, including：Smelting, continuous casting, hot continuous rolling, bell-type annealing, pickling and cold-rolling roll
System, bell-type annealing or continuous annealing, the step of finishing packaging, wherein：
Smelting process flow process is：Molten iron pre-desulfurization, converter smelting, argon station, LF ladle furnace/RH vacuum drying oven (embodiment 1 and 2
Steel adopt LF ladle furnace, embodiment 3 and 4 adopt RH vacuum drying oven), continuous casting casting, alloying of manganese is in converter smelting and external refining
Allocation proportion be 4：1, strand enters holding pit slow cooling cooling；1670～1730 DEG C of Tapping Temperature of Bof, external refining embodiment 1
Select LF stove, embodiment 3 and 4 to select RH vacuum drying oven to be processed with 2 steel, and carry out Al alloying, subsequently adopt privacy protection
Slag low casting speed continuous casting in carrying out, strand enters holding pit slow cooling and cools down to ensure cc billet surface quality.Strand is through 1200～1300 DEG C
Heating, carries out 5～12 passes by roughing mill, and with laggard 7 frame finish rolling, finishing temperature is 830～910 DEG C, coiling temperature
400～600 DEG C, hot rolled coil carries out air-cooled cooling using blower fan after batching.
The concrete fabrication process parameters of each embodiment steel are specifically shown in Table 2.
Table 2：
| Embodiment | Heating-up temperature/DEG C | Roughing passage | Finishing temperature/DEG C | Coiling temperature/DEG C |
| 1 | 1250 | 11 | 861 | 431 |
| 2 | 1260 | 9 | 876 | 550 |
| 3 | 1280 | 7 | 900 | 532 |
| 4 | 1280 | 9 | 892 | 580 |
The hot rolled coil of embodiment 1～4 steel carries out cover annealing process, cover annealing temperature corresponds to 720 respectively,
680th, 710,695 DEG C, the annealing soak time be respectively 10,12,11,11h.Subsequently, carry out pickling rolling, in pickling and cold-rolling rolling
Control the total HCl of pickle concentration in the range of 75～150g/l, cold rolling total reduction controls in 50～65% intervals.
Chill volume carries out cover annealing and continuous annealing respectively, and the steel of embodiment 1 and 2 carries out cover annealing temperature and divides
Not Wei 680,720 DEG C, the annealing soak time be respectively 10,11h, the steel of embodiment 3 and 4 divided using continuous annealing furnace annealing temperature
Not Wei 730,740 DEG C, soaking time is respectively 3,5min, smooth elongation percentage and is 1.1%.Subsequently, heat- treated steel volume carries out essence
Whole process.
As shown in table 3, finished product tensile strength is more than 800MPa to coil of strip room temperature tensile properties, elongation percentage is more than 35%, processing
Hardenability value n is more than 0.20, yield tensile ratio and is less than 0.75, and stresses typical strain curve is as shown in Figure 2.
Table 3 typical sample room temperature tensile mechanical property
| Specimen coding | Rp0.2/MPa | Rm/MPa | A50mm/ % | A80mm/ % | n5-10 |
| 1 | 607 | 839 | 35.5 | 31.7 | 0.21 |
| 2 | 589 | 834 | 36.5 | 32.5 | 0.22 |
| 3 | 600 | 840 | 33.5 | 29.5 | 0.21 |
| 4 | 593 | 841 | 34.0 | 29.5 | 0.21 |
The skin-deep X-ray diffraction result of product made from steel coil of strip Surface Fe of the present invention is as shown in figure 1, coil of strip surface and hot rolling after cover annealing
Coil of strip surface is compared, and there is relatively thin Fe3O4、Fe2O3(bloodstone), shows that steel of the present invention has relatively thin iron scale, in acid
Easy cleaned advantage during washing.
Fig. 2 and table 3 result show, the finished product tensile strength of steel of the present invention is more than 800MPa, elongation percentage is more than 35%, processing
Hardenability value n is more than 0.20, yield tensile ratio and is less than 0.75, has high intensity, high-ductility performance concurrently, has good cold stamping shaped property
Energy.
Fig. 3 a, Fig. 3 b show that steel of the present invention has micron-sized ultrafine-grained (UFG) microstructure, are organized as F+M+ metastable austenite, ferrum element
Body becomes equiax crystal pattern, grain size to be 0.2～2 μm, and martensite becomes the lath-shaped pattern, width of sheet to be with metastable austenite
0.2～0.5 μm.
Claims (2)
1. a kind of 800MPa grade high-strength high-plasticity low-carbon medium managese steel, its chemical composition is by mass percentage：C：0.05～
0.25%, Si：0.02～0.40%, Mn：3.0～7.0%, P≤0.015%, S≤0.015%, Al：1.50～3.5%, Cr：
0.02～0.60%, Cu≤0.50%, Mo≤0.40%, Nb≤0.10%, N≤0.010%, balance of Fe and inevitably
Impurity, its manufacture method includes：Smelting, continuous casting, hot continuous rolling, bell-type annealing, pickling and cold-rolling rolling, bell-type annealing or continuously move back
Fire, finishing packaging step it is characterised in that：
Described smelting process flow process is：Molten iron pre-desulfurization, converter smelting, argon station, LF ladle furnace/RH vacuum drying oven, continuous casting casting, institute
State Tapping Temperature of Bof and be 1670～1730 DEG C；Strand enters holding pit slow cooling cooling；
During described hot continuous rolling, strand heats through 1200～1300 DEG C, carries out 5～12 passes by roughing mill, with laggard finish rolling
Unit carries out 5～7 passes, and finishing temperature is 830～910 DEG C, 400～600 DEG C of coiling temperature, utilizes after hot rolled coil curling
Blower fan carries out air-cooled cooling；
Described cover annealing temperature is 680～720 DEG C, the annealing soak time is 10～12h；
Control the total HCl of pickle concentration in the range of 75～150g/l in described pickling and cold-rolling rolling；Cold rolling total reduction
Control in 50～65% intervals；
During described smelting, alloying of manganese is to be 41 in the allocation proportion of converter smelting and external refining.
2. 800MPa grade high-strength high-plasticity low-carbon medium managese steel according to claim 1 it is characterised in that：Described continuously move back
Stove annealing temperature is 720～750 DEG C, soaking time 3～5min, and smooth elongation percentage is 1.0～1.2%.
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| CN104911475B (en) * | 2015-06-25 | 2017-05-10 | 东北大学 | Preparation method for low-carbon medium-manganese high-toughness super-thick steel plate |
| CN104928569B (en) * | 2015-06-30 | 2017-03-01 | 宝山钢铁股份有限公司 | A kind of low density steel of 800MPa level high ductibility and its manufacture method |
| CN104946973B (en) * | 2015-07-15 | 2017-03-08 | 东北大学 | Manganese cut deal and preparation method thereof in a kind of high intensity, toughness, the low-carbon (LC) of plasticity |
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| CN107916359A (en) * | 2017-10-31 | 2018-04-17 | 华晨汽车集团控股有限公司 | A kind of preparation method of the medium managese steel with favorable forming property |
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| CN108624820B (en) * | 2018-04-20 | 2021-06-29 | 北京科技大学 | Automobile high-strength ductile steel with strength-elongation product of more than 45 GPa% and preparation method thereof |
| CN108546812B (en) * | 2018-05-14 | 2019-11-12 | 东北大学 | A kind of preparation method of high-strength medium managese steel plate |
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| CN110117755B (en) * | 2019-05-21 | 2020-11-03 | 安徽工业大学 | Preparation method of 980 MPa-grade cold-rolled medium manganese steel with low yield ratio |
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| CN111778450A (en) * | 2020-06-24 | 2020-10-16 | 南京钢铁股份有限公司 | Medium-manganese medium-thickness steel for 800MPa engineering machinery and manufacturing method thereof |
| CN114672739B (en) * | 2022-04-20 | 2023-08-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Reverse phase transformation vanadium microalloyed light high-strength steel and production method thereof |
| CN116536566A (en) * | 2023-03-28 | 2023-08-04 | 本钢板材股份有限公司 | Production method of 980 MPa-grade ultralow-carbon cold-rolled medium-manganese steel |
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| KR100554753B1 (en) * | 2001-12-27 | 2006-02-24 | 주식회사 포스코 | High strength cold rolled steel sheet with superior formability and weldability and method for manufacturing thereof |
| CN101638749B (en) * | 2009-08-12 | 2011-01-26 | 钢铁研究总院 | Automobile steel with low cost and high strength ductility balance and preparation method thereof |
| CN102021472B (en) * | 2011-01-12 | 2013-02-06 | 钢铁研究总院 | Production method for continuous annealing process high strength and plasticity automobile steel plate |
| CN102174685B (en) * | 2011-03-24 | 2013-01-02 | 武汉钢铁(集团)公司 | 800 MPa grade cold-rolling dual-phase steel and manufacturing method thereof |
| CN102758133B (en) * | 2012-07-26 | 2013-12-25 | 宝山钢铁股份有限公司 | 1000MPa-level automobile steel with high product of strength and elongation and manufacturing method thereof |
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