CN109898018A - Cold-rolled 1300 MPa-grade martensitic steel and production method thereof - Google Patents
Cold-rolled 1300 MPa-grade martensitic steel and production method thereof Download PDFInfo
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- CN109898018A CN109898018A CN201910156011.1A CN201910156011A CN109898018A CN 109898018 A CN109898018 A CN 109898018A CN 201910156011 A CN201910156011 A CN 201910156011A CN 109898018 A CN109898018 A CN 109898018A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 39
- 239000010959 steel Substances 0.000 title claims abstract description 39
- 229910000734 martensite Inorganic materials 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 238000005097 cold rolling Methods 0.000 claims abstract description 19
- 238000005098 hot rolling Methods 0.000 claims abstract description 11
- 238000005496 tempering Methods 0.000 claims abstract description 11
- 238000005096 rolling process Methods 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 238000010791 quenching Methods 0.000 claims abstract description 7
- 230000000171 quenching effect Effects 0.000 claims abstract description 7
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 239000000126 substance Substances 0.000 claims description 7
- 238000000137 annealing Methods 0.000 claims description 6
- 229910052717 sulfur Inorganic materials 0.000 claims description 6
- 238000003723 Smelting Methods 0.000 claims description 4
- 238000009749 continuous casting Methods 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- 238000005554 pickling Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims 1
- 230000032683 aging Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 11
- 230000007423 decrease Effects 0.000 description 5
- 229910052759 nickel Inorganic materials 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 229910052758 niobium Inorganic materials 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 229910052719 titanium Inorganic materials 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 241001062472 Stokellia anisodon Species 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention discloses cold-rolled 1300 MPa-grade martensitic steel and a production method thereof. C: 0.19% -0.25%, Si: 1.0% -1.5%, Mn: 1.8% -2.5%, Al: 0.02% -0.07%, P: less than or equal to 0.02 percent, S: less than or equal to 0.005 percent, less than or equal to 0.005 percent of N, and the balance of Fe and inevitable impurities. The heating temperature of the plate blank is 1230-1280 ℃, and the temperature is kept for more than 180 min; the initial rolling temperature of hot rolling is more than 1100 ℃, and the final rolling temperature is 900-1000 ℃; the coiling temperature is 650-700 ℃; the cold rolling reduction rate is controlled to be between 40 and 50 percent; heating at 839-880 ℃, keeping the temperature for 90-120s, water quenching, adding water at 700-750 ℃, cooling at 300-500 ℃/s, tempering at 300-350 ℃, aging for 370-400s, and then air cooling to room temperature.
Description
Technical field
The invention belongs to cold rolled automobile steel making fields, and it is economical greater than 1300MPa grades to be related to a kind of tensile strength
Cold rolling martensite steel plate and its production method.
Background technique
In recent years, along with the fast development of automotive light weight technology trend, advanced high-strength steel product and advanced forming technique
Application in automobile industry dramatically increases.Martensite steel (MS-Martensitic Steel) is that current commercialization is high-intensitive
The highest steel grade of intensity rank in steel plate is mainly changed into lath martensite group by high temperature austenitic body tissue rapid quenching
It knits, can be realized by hot rolling, cold rolling.The high intensity of martensite be due to highdensity dislocation, tiny twin, carbon it is inclined
Poly- and martensite pros degree gap solid solution etc..The form of low-carbon martensite is substantially lath-shaped, is small between lath-shaped
Angle grain boundary has very high dislocation density in lath, can also see twin crystal martensite sometimes and be distributed between lath.But after quenching
Martensite plasticity and toughness it is poor, general martensite steel will adjust the obdurability of steel by tempering process after quenching
Match.Usual martensite steel can only be produced with rolling formation or the part of punching press simple shape, and it is not high to be mainly used for forming requirements
The parts such as side door beams reduce manufacturing cost to replace tubular member.Quenched martensite tissue need to carry out tempering to change
It is apt to its plasticity, makes it under so high intensity, still there is enough forming properties.
CN103147020A discloses a kind of lonneal martensite unimach, and chemical component is C:0.35-
0.45%, Ni:3-6%, Co:2-5%, Si:1.5-2.5%, Mn:1.5-2.5%, Cr:0.5-1.25%, Mo:0.5-
2.0%, Nb:0.01-0.05%, Ti:0.01-0.03%, require S≤0.005%, P≤0.005%, O≤20PPm, N simultaneously
≤ 20PPm, manufacturing method are smelting, hot-working, heat treatment, and product is hot rolling material.The invention is on the basis of lonneal steel
The content for increasing Ni and Co element has adjusted Si and Mn constituent content, and compound addition Nb and Ti control of element crystal grain ruler
It is very little, and then develop the martensite steel low with superelevation tensile strength and high fracture toughness, yield tensile ratio.The patented product
The rare alloys constituent content such as Ni, Co is higher, and it is big to smelt production difficulty, and needs to carry out homogenize process, softening in manufacturing process
Processing and solution treatment, production technology are complicated.
CN101586217B discloses a kind of inexpensive ultra-high strength and toughness martensite steel and its manufacturing method, and composition range is such as
Under, C:0.4-0.6%, Si:1.4-1.6%, Mn:1.6-1.8%, Cr:0.5-0.7%, Ni:0.2-0.4%, Al:0.06-
0.09%, N:0.01-0.04%, Ti:0.01-0.03%, Nb:0.02-0.06%, S :≤0.01%, P :≤0.01%.It should
Patent uses the methods of refined crystalline strengthening, precipitation strength, precipitation strength, controls in conjunction with retained austenite, improves high strength steel
Plasticity, produces the martensite steel that tensile strength is greater than 2000MPa, and product type belongs to hot rolling material.In alloying component, although its
The effect for having fully considered cheap microelement, reduces the dosage of rare alloy element, but still it is different degrees of be added to Cr,
The alloying elements such as Ni, Ti, Nb；Preparation method include smelt, casting, forging or rolling, with water quenching, tempering, and cast after also
Electro-slag continuous casting remelting need to be carried out, environmental pollution is serious, and increased costs are larger.
From the patent inquired as it can be seen that the presently disclosed invention about super-strength martensitic steel is mostly hot-rolled product,
And the cold-rolled products that can be used for the manufacture of automobile industry high intensity vehicle body parts are then very little.
Summary of the invention
The purpose of the present invention is to provide a kind of cold rolling tensile strength to be greater than 1300MPa grades of martensite steel plates and its producer
Method.
In order to achieve the above object, the present invention is implemented with the following technical solutions:
A kind of cold rolling 1300MPa grades of martensite steels, it is characterised in that chemical component is by percentage to the quality are as follows:
C:0.19%-0.25%, Si:1.0%-1.5%, Mn:1.8%-2.5%, Al:0.02%-0.07%, P :≤
0.02%, S :≤0.005%, N≤0.005%, surplus are Fe and inevitable impurity.
The present invention selects chemical component and range according to following principle:
C:C is one of most effective intensified element in steel, plays the role of improving martensite hardness in the present invention, to steel
Plate intensity effect is significant, and the intensity of steel plate significantly increases with the raising of C content.Phosphorus content is too low, the decline of martensite hardness, intensity
It is unable to satisfy requirement.Carbon content is excessively high, and the plasticity decline of steel plate, formability and weldability reduce.Therefore the present invention claims C to contain
Amount is between 0.19-0.25%.
Si:Si is non-carbide forming element, has and inhibits Carbide Precipitation, delays carbide to cementite transformation, resistance
The only effect of Carbide Coarsening is conducive to the hardness that martensite is kept in drawing process.Si is easy to be enriched with shape in surface of steel plate
At oxidation film, too high levels will lead to surface quality decline, while influence plasticity and welding performance.Therefore the Si in the present invention contains
Amount is 1.2-1.8%.
Mn: it is one of effective solution strengthening element, can effectively improve the harden ability of product, martensite can be promoted
It being formed, Mn content is too low, and martensite forming amount is insufficient, intensity decline, Mn too high levels, it will cause serious component segregation,
Banded structure is formed, the uniformity of tissue is unfavorable for.Therefore the Mn content that the present invention selects is in 1.8-2.5% range.
Al:Al plays deoxidation and Grain refinement in steel, and too high levels are unfavorable for continuous casting, therefore the present invention wants
Ask Al content between 0.02-0.07%.
P, S:P, S are relict element, and P easily causes steel plate center segregation, the serious impact flexibility for destroying steel, and there are secondary
Brittleness is processed, the hot-working and weldability of steel plate are unfavorable for；S easily forms non-metallic inclusion with Mn, makes the clod wash and expansion of steel plate
Pore performance decline, therefore both should try to control in reduced levels.That is P≤0.02%, S≤0.005%, N≤0.005%.
A kind of cold rolling 1300MPa grades of martensite steel production methods are as follows: smelting → continuous casting → hot rolling → pickling → cold rolling → company
Continuous annealing.
Hot rolling: slab heating temperature is 1230~1280 DEG C, keeps the temperature 180min or more；Hot rolling start rolling temperature is greater than 1100
DEG C, finishing temperature is 900~1000 DEG C；Coiling temperature is 650~700 DEG C.Slab heating temperature is low or soaking time is short, meeting
It causes temperature uneven, comes to rolled bands difficult；Heating temperature is high or soaking time length can make slab burning, and crystal grain is extremely long
Greatly, start rolling temperature be in order to guarantee that finishing temperature, the range of finishing temperature then ensure that the operation of rolling is smooth, resistance of deformation compared with
It is small.Coiling temperature is excessively high, and flat volume phenomenon easily occurs after batching；Coiling temperature is low, and hot rolling plate strength improves, and cold rolling production difficulty increases
Add.
Cold rolling: hot rolled plate carries out cold rolling after conventional pickling, and cold rolling reduction ratio controls between 40~50%.Under cold rolling
Rate is low, and die break degree is limited, and performance not can guarantee；Cold rolling reduction ratio is excessively high, and mill load increases, big to equipment damage.
Continuous annealing: heating temperature is 839~880 DEG C, soaking time 90-120s, water quenching, and entering coolant-temperature gage is 700-
750 DEG C, cooling rate is 300-500 DEG C/s, tempering, tempering temperature are as follows: 300-350 DEG C, tempering time are as follows: 370-400s, Zhi Houfeng
It is cooled to room temperature.Acid extraction guarantees steel plate complete austenitizing, and temperature is excessively high or overlong time, not only wastes energy
Source, and it is excessive to will cause crystallite dimension.It is excessively high to enter coolant-temperature gage, armor plate strength improves, and elongation percentage not can guarantee；It is low to enter coolant-temperature gage,
Then low strength.Tempering temperature is high or the time is long, a large amount of Carbide Precipitations is had in steel plate, strength reduction is larger；Temperature it is low or
Time is short, and stress elimination is incomplete, and steel plate elongation percentage is lower.
Method is designed and produced using ingredient provided by the present invention, 1300MPa can be greater than with output tensile strength, extended
Rate is greater than 6% martensite super high tensile cold-rolled steel plate, and intensity and plasticity standard are more than existing GB standard requirement.The present invention
Chemical component it is simple, in addition to C, Si, Mn without add any rare or precious metal element, smelting cost is cheap, technology controlling and process
Simplicity belongs to the economical product of low cost.The steel plate produced not only has intensity height, but also has certain mouldability
Can, it can be applied to the high-intensitive vehicle body parts of roll-in processing automobile industry demand.
Specific embodiment
It is illustrated combined with specific embodiments below:
Embodiment chemical component is as shown in table 1:
1 chemical component of table (wt%)
| Embodiment | C | Si | Mn | P | S | Al | N | Fe |
| 1 | 0.22 | 1.05 | 1.95 | 0.011 | 0.0023 | 0.042 | 0.0038 | Surplus |
| 2 | 0.20 | 1.22 | 1.92 | 0.018 | 0.0028 | 0.040 | 0.0035 | Surplus |
| 3 | 0.19 | 1.16 | 2.3 | 0.020 | 0.0025 | 0.060 | 0.0045 | Surplus |
| 4 | 0.25 | 1.2 | 1.85 | 0.016 | 0.0020 | 0.035 | 0.0028 | Surplus |
| 5 | 0.23 | 1.13 | 1.97 | 0.019 | 0.0028 | 0.050 | 0.0032 | Surplus |
| 6 | 0.21 | 1.15 | 1.95 | 0.015 | 0.0024 | 0.032 | 0.0035 | Surplus |
Embodiment rolling technological parameter is as shown in table 2:
2 rolling technological parameter of table
Embodiment continuous annealing process parameter is as shown in table 3:
3 continuous annealing process parameter of table
The mechanical property of embodiment steel plate is as shown in table 4:
The mechanical property of 4 steel plate of table
| Embodiment | Rp0.2(MPa) | Rm(MPa) | A (%) |
| 1 | 1063 | 1323 | 6.0 |
| 2 | 1050 | 1342 | 6.3 |
| 3 | 1038 | 1339 | 6.5 |
| 4 | 1025 | 1347 | 6.1 |
| 5 | 1039 | 1340 | 6.3 |
| 6 | 1046 | 1345 | 6.2 |
Claims (2)
1. a kind of cold rolling 1300MPa grades of martensite steels, it is characterised in that chemical component is by percentage to the quality are as follows: C:0.19%-
0.25%, Si:1.0%-1.5%, Mn:1.8%-2.5%, Al:0.02%-0.07%, P :≤0.02%, S :≤0.005%,
N≤0.005%, surplus are Fe and inevitable impurity.
2. a kind of a kind of cold rolling 1300MPa grades of martensite steel production methods according to claim 1, including smelting, continuous casting,
Hot rolling, pickling, cold rolling, continuous annealing, it is characterised in that: the hot rolling are as follows: slab heating temperature is 1230~1280 DEG C, heat preservation
180min or more；Hot rolling start rolling temperature is greater than 1100 DEG C, and finishing temperature is 900~1000 DEG C；Coiling temperature is 650~700
℃；The cold rolling are as follows: cold rolling reduction ratio controls between 40~50%；The continuous annealing are as follows: heating temperature is 839~880
DEG C, soaking time 90-120s, water quenching, entering coolant-temperature gage is 700-750 DEG C, and cooling rate is 300-500 DEG C/s, tempering, tempering temperature
Are as follows: 300-350 DEG C, tempering time are as follows: 370-400s, it is air-cooled later to room temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910156011.1A CN109898018A (en) | 2019-03-01 | 2019-03-01 | Cold-rolled 1300 MPa-grade martensitic steel and production method thereof |
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| CN201910156011.1A CN109898018A (en) | 2019-03-01 | 2019-03-01 | Cold-rolled 1300 MPa-grade martensitic steel and production method thereof |
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| CN109898018A true CN109898018A (en) | 2019-06-18 |
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| CN201910156011.1A Pending CN109898018A (en) | 2019-03-01 | 2019-03-01 | Cold-rolled 1300 MPa-grade martensitic steel and production method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111979470A (en) * | 2020-08-05 | 2020-11-24 | 鞍钢股份有限公司 | Production method of ultrahigh-strength cold-rolled martensite steel plate with good bending property |
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2019
- 2019-03-01 CN CN201910156011.1A patent/CN109898018A/en active Pending
Patent Citations (6)
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| CN111979470A (en) * | 2020-08-05 | 2020-11-24 | 鞍钢股份有限公司 | Production method of ultrahigh-strength cold-rolled martensite steel plate with good bending property |
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