CN109371317A - A kind of 1000MPa grades of ultrafast cold cold-rolled biphase steel plate and preparation method thereof - Google Patents
A kind of 1000MPa grades of ultrafast cold cold-rolled biphase steel plate and preparation method thereof Download PDFInfo
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- CN109371317A CN109371317A CN201811115404.XA CN201811115404A CN109371317A CN 109371317 A CN109371317 A CN 109371317A CN 201811115404 A CN201811115404 A CN 201811115404A CN 109371317 A CN109371317 A CN 109371317A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 99
- 239000010959 steel Substances 0.000 title claims abstract description 99
- 238000002360 preparation method Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 101
- 238000009749 continuous casting Methods 0.000 claims abstract description 61
- 238000001816 cooling Methods 0.000 claims abstract description 55
- 238000000137 annealing Methods 0.000 claims abstract description 50
- 238000003723 Smelting Methods 0.000 claims abstract description 49
- 238000005097 cold rolling Methods 0.000 claims abstract description 38
- 239000000203 mixture Substances 0.000 claims abstract description 29
- 239000000126 substance Substances 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000005098 hot rolling Methods 0.000 claims abstract description 13
- 239000012535 impurity Substances 0.000 claims abstract description 9
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000010583 slow cooling Methods 0.000 claims description 12
- 238000004321 preservation Methods 0.000 claims description 2
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 16
- 229910000734 martensite Inorganic materials 0.000 abstract description 15
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000002253 acid Substances 0.000 abstract description 4
- 239000004615 ingredient Substances 0.000 abstract description 4
- 229910052804 chromium Inorganic materials 0.000 abstract description 2
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 2
- 238000005096 rolling process Methods 0.000 description 13
- 239000011572 manganese Substances 0.000 description 7
- 239000010955 niobium Substances 0.000 description 7
- 229910001566 austenite Inorganic materials 0.000 description 5
- 239000000243 solution Substances 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 229910000885 Dual-phase steel Inorganic materials 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 229910017112 Fe—C Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 208000020442 loss of weight Diseases 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding 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
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
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Abstract
The invention discloses a kind of 1000MPa grades ultrafast cold cold-rolled biphase steel plates and preparation method thereof, the steel plate chemical component composition and its mass percentage are as follows: C:0.1~0.15%, Si:0.3~0.9%, Mn:1.6~2.2%, P≤0.015, S≤0.008%, Als:0.03~0.06%, Nb:0.02~0.05%, N≤0.005%, remaining is Fe and inevitable impurity；The preparation method includes smelting, continuous casting, hot rolling, cold rolling, annealing, smooth process.The present invention is designed by Nb microalloying without Cr, Mo ingredient, is reduced rolled steel plate harden ability and intensity, is conducive to acid and rolls steady production；It is ultrafast cold using continuous annealing process water cooling, steel plate harden ability is improved, obtains ferrite+martensite duplex structure pattern cold-rolled biphase steel, structure property is uniform, excellent in mechanical performance.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of 1000MPa grades of ultrafast cold cold-rolled biphase steel plate and its system
Preparation Method.
Background technique
Development with from Hyundai Motor to the lightweights such as loss of weight, energy conservation, high security direction pushes automobile high-strength thin
The research and development of steel plate.Dual phase steel have low yield tensile ratio, high initial manufacture hardening rate, intensity and ductility it is good fit etc. excellent
Point has been developed as a kind of good high-tensile structural steel of formability, becomes one of preferred steel grade of Hyundai Motor steel.
The microscopic structure of 1000MPa grades of cold-rolled biphase steels is mainly by softer ferrite matrix and a small amount of hard martensitic phase
Composition.Dual phase steel is a kind of advanced high-strength steel based on phase transformation strengthening, can be heat-treated and control through critical zone by mild steel
Rolling mill practice processed obtains, the compound structural state of this two-phase, makes it have good strong plasticity matching and cold deformation energy, quilt
It is widely used in structural member, reinforcer and anti-striker, such as bumper, vehicle bottom cross member, rail, crash bar, crash bar
Reinforcement structure part etc..
Pass through the 1000MPa grade cold rolling of update search to Publication No. 102586688A, 107043888A, 105132816A
Dual phase steel related invention patent, containing being improved harden ability element Cr in ingredient, it will improve quenching during hot-rolled steel plate
Permeability keeps its rolled armor plate strength higher, but this is unfavorable for subsequent acid and rolls production.
Therefore the ultrafast cold cold-rolled biphase steel plate of 1000MPa grade without Cr component system is developed, adds a certain amount of Nb in ingredient
Element all has important function to the forming core of C enrichment and martensite in transformation behavior, crystal grain refinement, austenite, reduces rolled
Steel plate harden ability and intensity improve acid and roll production stability, are conducive to improve steel formability performance, product has preferable market
Prospect.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of 1000MPa grades ultrafast cold cold-rolled biphase steel plate and its preparation sides
Method.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of 1000MPa grades of ultrafast cold rolling two-phase
Steel plate, the steel plate chemical component composition and its mass percentage are as follows: C:0.1~0.15%, Si:0.3~0.9%, Mn:1.6
~2.2%, P≤0.015, S≤0.008%, Als:0.03~0.06%, Nb:0.02~0.05%, N≤0.005%, remaining for Fe and
Inevitable impurity.
Steel plate yield strength of the present invention: 600~800MPa, tensile strength: 1000~1150MPa, elongation percentage: 10~
18%。
The present invention also provides the preparation method of a kind of 1000MPa grades ultrafast cold cold-rolled biphase steel plate, the preparation methods
Including smelting, continuous casting, hot rolling, cold rolling, annealing, smooth process；The annealing operation, rapid cooling section is ultrafast cold using water cooling, with
The cooling rate of 120~150 DEG C/s is cooled to 50-60 DEG C fastly.
The present invention uses continuous annealing process, and strip is heated to 820~850 DEG C with the rate of heat addition of 1~3 DEG C/s, is protected
It is then ultrafast cold using water cooling with 2~4 DEG C/s slow cooling to 690~720 DEG C after 120~150s of temperature, with the cold of 120~150 DEG C/s
But rate is cooled to 50-60 DEG C fastly, then with the rate of heat addition of 20~30 DEG C/s be heated to 250 DEG C of progress Wetted constructures 250~
400s。
Smelting procedure of the present invention, using converter smelting, LF+RH duplex technique.
Continuous casting working procedure of the present invention, molten steel obtains continuous casting billet through continuous casting after smelting, continuous casting billet chemical component composition and its
Mass percentage are as follows: C:0.1~0.15%, Si:0.3~0.9%, Mn:1.6~2.2%, P≤0.015, S≤0.008%, Als:
0.03~0.06%, Nb:0.02~0.05%, N≤0.005%, remaining is Fe and inevitable impurity.
Hot-rolled process of the present invention, by heating of plate blank to 1230~1270 DEG C, finishing temperature control at 880~910 DEG C,
It is cooled to 600~650 DEG C by laminar cooling system after rolling to batch, 15~20 DEG C/s of cooling rate.Cold-roller of the present invention
Sequence, cold rolling reduction ratio are controlled 50~60%.
Smooth process of the present invention, smooth elongation percentage are 0.4~0.7%.
The content of each component element of the present invention and effect are as follows:
C: carbon is effective intensified element, can increase substantially the intensity of steel.But the excessively high welding performance that can deteriorate steel of carbon content,
And solution strengthening enhancing, which causes intensity to increase plasticity, to be reduced.It is 0.1~0.15% that the present invention, which selects C content, and C content is too low, then
It cannot be guaranteed armor plate strength.
Si: silicon is ferrite former, is mainly present in steel in a manner of solid solution and plays invigoration effect.Si is non-carbide
Formation element can expand the area α+γ in Fe-C phasor, improve austenite to ferrite transformation temperature, promote ferrite analysis
Out.The present invention selects Si content to be easy to cause surface quality problems for 0.3~0.9%, Si too high levels.
Mn: manganese is austenite stabilizer element, has apparent inhibiting effect to Austenite Recrystallization Process, properly increases Mn
Content can make full use of non-recrystallization controlled rolling to refine crystal grain, and Mn also has certain solution strengthening effect, can improve
Plasticity and toughness.It is 1.6~2.2% that the present invention, which selects Mn content,.
Nb: niobium plays a significant role the forming core of C enrichment and martensite in transformation behavior, crystal grain refinement, austenite.This hair
It is bright that select Nb content be 0.02~0.05%.
P: being impurity element in steel, it is desirable that≤0.015%.
S: being impurity element in steel, it is desirable that≤0.008%.
Als: playing deoxidation and Grain refinement in steel, is 0.03~0.06% the present invention claims ALs content.
N: being impurity element in steel, it is desirable that≤0.005%.
1000MPa grades of ultrafast cold cold-rolled biphase steel panel products canonical reference GB/T 20564.2-2017 of the present invention；Product
It can detection method canonical reference GB/T 228.1-2010.
The beneficial effects of adopting the technical scheme are that 1, the present invention by Nb microalloying without Cr, Mo at
Set up meter separately, reduces rolled steel plate harden ability and intensity, be conducive to acid and roll steady production.2, the present invention utilizes continuous annealing process water cooling
It is ultrafast cold, steel plate harden ability is improved, ferrite+martensite duplex structure pattern cold-rolled biphase steel is obtained, structure property is uniform,
Excellent in mechanical performance.
Detailed description of the invention
Fig. 1 is the ultrafast cold cold-rolled biphase steel plate metallographic structure figure (1000 times) of 1000MPa grade of embodiment 1；
Fig. 2 is the ultrafast cold cold-rolled biphase steel plate metallographic structure figure (1000 times) of 1000MPa grade of embodiment 2；
Fig. 3 is the ultrafast cold cold-rolled biphase steel plate metallographic structure figure (1000 times) of 1000MPa grade of embodiment 3；
Fig. 4 is the ultrafast cold cold-rolled biphase steel plate metallographic structure figure (1000 times) of 1000MPa grade of embodiment 4；
Fig. 5 is the ultrafast cold cold-rolled biphase steel plate metallographic structure figure (1000 times) of 1000MPa grade of embodiment 5；
Fig. 6 is the ultrafast cold cold-rolled biphase steel plate metallographic structure figure (1000 times) of 1000MPa grade of embodiment 6；
Fig. 7 is the ultrafast cold cold-rolled biphase steel plate metallographic structure figure (1000 times) of 1000MPa grade of embodiment 7；
Fig. 8 is the ultrafast cold cold-rolled biphase steel plate metallographic structure figure (1000 times) of 1000MPa grade of embodiment 8；
Fig. 9 is the ultrafast cold cold-rolled biphase steel plate metallographic structure figure (1000 times) of 1000MPa grade of embodiment 9；
Figure 10 is the ultrafast cold cold-rolled biphase steel plate metallographic structure figure (1000 times) of 1000MPa grade of embodiment 10.Specific embodiment party
Formula
Present invention will be explained in further detail combined with specific embodiments below.
Embodiment 1
1000MPa grades of the present embodiment ultrafast cold cold-rolled biphase steel plate chemical component compositions and its mass percentage are shown in Table 1.
The preparation method of 1000MPa grades of ultrafast cold cold-rolled biphase steel plates includes smelting, continuous casting, hot rolling, cold rolling, annealing, puts down
Whole process, specific process step are as described below:
(1) converter smelting, LF+RH duplex technique smelting procedure: are used；
(2) continuous casting working procedure: molten steel obtains continuous casting billet, continuous casting billet chemical component composition and its mass percentage through continuous casting after smelting
It is shown in Table 1；
(3) hot-rolled process: by heating of plate blank to 1244 DEG C, finishing temperature control is cold by laminar cooling system after rolling at 880 DEG C
But it is batched to 633 DEG C, 15 DEG C/s of cooling rate；
(4) cold rolling process: cold rolling reduction ratio is controlled 53.8%；
(5) annealing operation: annealing way uses continuous annealing, and strip is heated to 829 DEG C with the rate of heat addition of 1.0 DEG C/s, is protected
It is then ultrafast cold using water cooling with 2 DEG C/s slow cooling to 720 DEG C after warm 140s, it is cooled to 55 DEG C fastly with the cooling rate of 134 DEG C/s,
250 DEG C of progress Wetted constructures 284s are heated to the rate of heat addition of 20 DEG C/s again；
(6) smooth process: smooth elongation percentage is 0.47%.
1000MPa grades of the present embodiment ultrafast cold cold-rolled biphase steel plate mechanical properties are shown in Table 2；Metallographic structure figure is shown in Fig. 1, by scheming
1 visible tissue is ferrite+martensite duplex structure.
Embodiment 2
1000MPa grades of the present embodiment ultrafast cold cold-rolled biphase steel plate chemical component compositions and its mass percentage are shown in Table 1.
The preparation method of 1000MPa grades of ultrafast cold cold-rolled biphase steel plates includes smelting, continuous casting, hot rolling, cold rolling, annealing, puts down
Whole process, specific process step are as described below:
(1) converter smelting, LF+RH duplex technique smelting procedure: are used；
(2) continuous casting working procedure: molten steel obtains continuous casting billet, continuous casting billet chemical component composition and its mass percentage through continuous casting after smelting
It is shown in Table 1；
(3) hot-rolled process: by heating of plate blank to 1230 DEG C, finishing temperature control is cold by laminar cooling system after rolling at 899 DEG C
But it is batched to 618 DEG C, 20 DEG C/s of cooling rate；
(4) cold rolling process: cold rolling reduction ratio is controlled 50%；
(5) annealing operation: annealing way uses continuous annealing, and strip is heated to 834 DEG C with the rate of heat addition of 1.8 DEG C/s, is protected
It is then ultrafast cold using water cooling with 4 DEG C/s slow cooling to 697 DEG C after warm 128s, it is cooled to 55 DEG C fastly with the cooling rate of 120 DEG C/s,
250 DEG C of progress Wetted constructures 343s are heated to the rate of heat addition of 30 DEG C/s again；
(6) smooth process: smooth elongation percentage is 0.51%.
1000MPa grades of the present embodiment ultrafast cold cold-rolled biphase steel plate mechanical properties are shown in Table 2；Metallographic structure figure is shown in Fig. 2, by scheming
2 visible tissues are ferrite+martensite duplex structure.
Embodiment 3
1000MPa grades of the present embodiment ultrafast cold cold-rolled biphase steel plate chemical component compositions and its mass percentage are shown in Table 1.
The preparation method of 1000MPa grades of ultrafast cold cold-rolled biphase steel plates includes smelting, continuous casting, hot rolling, cold rolling, annealing, puts down
Whole process, specific process step are as described below:
(1) converter smelting, LF+RH duplex technique smelting procedure: are used；
(2) continuous casting working procedure: molten steel obtains continuous casting billet, continuous casting billet chemical component composition and its mass percentage through continuous casting after smelting
It is shown in Table 1；
(3) hot-rolled process: by heating of plate blank to 1247 DEG C, finishing temperature control is cold by laminar cooling system after rolling at 892 DEG C
But it is batched to 600 DEG C, 17 DEG C/s of cooling rate；
(4) cold rolling process: cold rolling reduction ratio is controlled 53.3%；
(5) annealing operation: annealing way uses continuous annealing, and strip is heated to 820 DEG C with the rate of heat addition of 1.8 DEG C/s, is protected
It is then ultrafast cold using water cooling with 2.5 DEG C/s slow cooling to 713 DEG C after warm 120s, it is cooled to 55 fastly with the cooling rate of 141 DEG C/s
DEG C, then 250 DEG C of progress Wetted constructures 250s are heated to the rate of heat addition of 26 DEG C/s；
(6) smooth process: smooth elongation percentage is 0.40%.
1000MPa grades of the present embodiment ultrafast cold cold-rolled biphase steel plate mechanical properties are shown in Table 2；Metallographic structure figure is shown in Fig. 3, by scheming
3 visible tissues are ferrite+martensite duplex structure.
Embodiment 4
1000MPa grades of the present embodiment ultrafast cold cold-rolled biphase steel plate chemical component compositions and its mass percentage are shown in Table 1.
The preparation method of 1000MPa grades of ultrafast cold cold-rolled biphase steel plates includes smelting, continuous casting, hot rolling, cold rolling, annealing, puts down
Whole process, specific process step are as described below:
(1) converter smelting, LF+RH duplex technique smelting procedure: are used；
(2) continuous casting working procedure: molten steel obtains continuous casting billet, continuous casting billet chemical component composition and its mass percentage through continuous casting after smelting
It is shown in Table 1；
(3) hot-rolled process: by heating of plate blank to 1246 DEG C, finishing temperature control is cold by laminar cooling system after rolling at 890 DEG C
But it is batched to 629 DEG C, 18 DEG C/s of cooling rate；
(4) cold rolling process: cold rolling reduction ratio is controlled 55.6%；
(5) annealing operation: annealing way uses continuous annealing, and strip is heated to 828 DEG C with the rate of heat addition of 1.6 DEG C/s, is protected
It is then ultrafast cold using water cooling with 3.2 DEG C/s slow cooling to 709 DEG C after warm 135s, it is cooled to 55 fastly with the cooling rate of 129 DEG C/s
DEG C, then 250 DEG C of progress Wetted constructures 311s are heated to the rate of heat addition of 24 DEG C/s；
(6) smooth process: smooth elongation percentage is 0.58%.
1000MPa grades of the present embodiment ultrafast cold cold-rolled biphase steel plate mechanical properties are shown in Table 2；Metallographic structure figure is shown in Fig. 4, by scheming
4 visible tissues are ferrite+martensite duplex structure.
Embodiment 5
1000MPa grades of the present embodiment ultrafast cold cold-rolled biphase steel plate chemical component compositions and its mass percentage are shown in Table 1.
The preparation method of 1000MPa grades of ultrafast cold cold-rolled biphase steel plates includes smelting, continuous casting, hot rolling, cold rolling, annealing, puts down
Whole process, specific process step are as described below:
(1) converter smelting, LF+RH duplex technique smelting procedure: are used；
(2) continuous casting working procedure: molten steel obtains continuous casting billet, continuous casting billet chemical component composition and its mass percentage through continuous casting after smelting
It is shown in Table 1；
(3) hot-rolled process: by heating of plate blank to 1247 DEG C, finishing temperature control is cold by laminar cooling system after rolling at 902 DEG C
But it is batched to 635 DEG C, 17 DEG C/s of cooling rate；
(4) cold rolling process: cold rolling reduction ratio is controlled 55.6%；
(5) annealing operation: annealing way uses continuous annealing, and strip is heated to 832 DEG C with the rate of heat addition of 2.2 DEG C/s, is protected
It is then ultrafast cold using water cooling with 3.6 DEG C/s slow cooling to 698 DEG C after warm 139s, it is cooled to 55 fastly with the cooling rate of 134 DEG C/s
DEG C, then 250 DEG C of progress Wetted constructures 299s are heated to the rate of heat addition of 29 DEG C/s；
(6) smooth process: smooth elongation percentage is 0.57%.
1000MPa grades of the present embodiment ultrafast cold cold-rolled biphase steel plate mechanical properties are shown in Table 2；Metallographic structure figure is shown in Fig. 5, by scheming
5 visible tissues are ferrite+martensite duplex structure.
Embodiment 6
1000MPa grades of the present embodiment ultrafast cold cold-rolled biphase steel plate chemical component compositions and its mass percentage are shown in Table 1.
The preparation method of 1000MPa grades of ultrafast cold cold-rolled biphase steel plates includes smelting, continuous casting, hot rolling, cold rolling, annealing, puts down
Whole process, specific process step are as described below:
(1) converter smelting, LF+RH duplex technique smelting procedure: are used；
(2) continuous casting working procedure: molten steel obtains continuous casting billet, continuous casting billet chemical component composition and its mass percentage through continuous casting after smelting
It is shown in Table 1；
(3) hot-rolled process: by heating of plate blank to 1250 DEG C, finishing temperature control is cold by laminar cooling system after rolling at 895 DEG C
But it is batched to 623 DEG C, 16 DEG C/s of cooling rate；
(4) cold rolling process: cold rolling reduction ratio is controlled 56.5%；
(5) annealing operation: annealing way uses continuous annealing, and strip is heated to 850 DEG C with the rate of heat addition of 2.3 DEG C/s, is protected
It is then ultrafast cold using water cooling with 2.2 DEG C/s slow cooling to 690 DEG C after warm 141s, it is cooled to 55 fastly with the cooling rate of 143 DEG C/s
DEG C, then 250 DEG C of progress Wetted constructures 355s are heated to the rate of heat addition of 24 DEG C/s；
(6) smooth process: smooth elongation percentage is 0.62%.
1000MPa grades of the present embodiment ultrafast cold cold-rolled biphase steel plate mechanical properties are shown in Table 2；Metallographic structure figure is shown in Fig. 6, by scheming
6 visible tissues are ferrite+martensite duplex structure.
Embodiment 7
1000MPa grades of the present embodiment ultrafast cold cold-rolled biphase steel plate chemical component compositions and its mass percentage are shown in Table 1.
The preparation method of 1000MPa grades of ultrafast cold cold-rolled biphase steel plates includes smelting, continuous casting, hot rolling, cold rolling, annealing, puts down
Whole process, specific process step are as described below:
(1) converter smelting, LF+RH duplex technique smelting procedure: are used；
(2) continuous casting working procedure: molten steel obtains continuous casting billet, continuous casting billet chemical component composition and its mass percentage through continuous casting after smelting
It is shown in Table 1；
(3) hot-rolled process: by heating of plate blank to 1267 DEG C, finishing temperature control is cold by laminar cooling system after rolling at 910 DEG C
But it is batched to 638 DEG C, 18 DEG C/s of cooling rate；
(4) cold rolling process: cold rolling reduction ratio is controlled 55.9%；
(5) annealing operation: annealing way uses continuous annealing, strip is heated to 837 DEG C with the rate of heat addition of 3 DEG C/s, heat preservation
It is then ultrafast cold using water cooling with 2.7 DEG C/s slow cooling to 708 DEG C after 140s, it is cooled to 55 DEG C fastly with the cooling rate of 138 DEG C/s,
250 DEG C of progress Wetted constructures 369s are heated to the rate of heat addition of 23 DEG C/s again；
(6) smooth process: smooth elongation percentage is 0.54%.
1000MPa grades of the present embodiment ultrafast cold cold-rolled biphase steel plate mechanical properties are shown in Table 2；Metallographic structure figure is shown in Fig. 7, by scheming
7 visible tissues are ferrite+martensite duplex structure.
Embodiment 8
1000MPa grades of the present embodiment ultrafast cold cold-rolled biphase steel plate chemical component compositions and its mass percentage are shown in Table 1.
The preparation method of 1000MPa grades of ultrafast cold cold-rolled biphase steel plates includes smelting, continuous casting, hot rolling, cold rolling, annealing, puts down
Whole process, specific process step are as described below:
(1) converter smelting, LF+RH duplex technique smelting procedure: are used；
(2) continuous casting working procedure: molten steel obtains continuous casting billet, continuous casting billet chemical component composition and its mass percentage through continuous casting after smelting
It is shown in Table 1；
(3) hot-rolled process: by heating of plate blank to 1253 DEG C, finishing temperature control is cold by laminar cooling system after rolling at 893 DEG C
But it is batched to 641 DEG C, 19 DEG C/s of cooling rate；
(4) cold rolling process: cold rolling reduction ratio is controlled 54.8%；
(5) annealing operation: annealing way uses continuous annealing, and strip is heated to 826 DEG C with the rate of heat addition of 1.9 DEG C/s, is protected
It is then ultrafast cold using water cooling with 3.8 DEG C/s slow cooling to 711 DEG C after warm 150s, it is cooled to 55 fastly with the cooling rate of 150 DEG C/s
DEG C, then 250 DEG C of progress Wetted constructures 400s are heated to the rate of heat addition of 21 DEG C/s；
(6) smooth process: smooth elongation percentage is 0.7%.
1000MPa grades of the present embodiment ultrafast cold cold-rolled biphase steel plate mechanical properties are shown in Table 2；Metallographic structure figure is shown in Fig. 8, by scheming
8 visible tissues are ferrite+martensite duplex structure.
Embodiment 9
1000MPa grades of the present embodiment ultrafast cold cold-rolled biphase steel plate chemical component compositions and its mass percentage are shown in Table 1.
The preparation method of 1000MPa grades of ultrafast cold cold-rolled biphase steel plates includes smelting, continuous casting, hot rolling, cold rolling, annealing, puts down
Whole process, specific process step are as described below:
(1) converter smelting, LF+RH duplex technique smelting procedure: are used；
(2) continuous casting working procedure: molten steel obtains continuous casting billet, continuous casting billet chemical component composition and its mass percentage through continuous casting after smelting
It is shown in Table 1；
(3) hot-rolled process: by heating of plate blank to 1270 DEG C, finishing temperature control is cold by laminar cooling system after rolling at 901 DEG C
But it is batched to 637 DEG C, 17 DEG C/s of cooling rate；
(4) cold rolling process: cold rolling reduction ratio is controlled 60%；
(5) annealing operation: annealing way uses continuous annealing, and strip is heated to 834 DEG C with the rate of heat addition of 2.2 DEG C/s, is protected
It is then ultrafast cold using water cooling with 3.5 DEG C/s slow cooling to 705 DEG C after warm 135s, it is cooled to 55 fastly with the cooling rate of 136 DEG C/s
DEG C, then 250 DEG C of progress Wetted constructures 340s are heated to the rate of heat addition of 26 DEG C/s；
(6) smooth process: smooth elongation percentage is 0.46%.
1000MPa grades of the present embodiment ultrafast cold cold-rolled biphase steel plate mechanical properties are shown in Table 2；Metallographic structure figure is shown in Fig. 9, by scheming
9 visible tissues are ferrite+martensite duplex structure.
Embodiment 10
1000MPa grades of the present embodiment ultrafast cold cold-rolled biphase steel plate chemical component compositions and its mass percentage are shown in Table 1.
The preparation method of 1000MPa grades of ultrafast cold cold-rolled biphase steel plates includes smelting, continuous casting, hot rolling, cold rolling, annealing, puts down
Whole process, specific process step are as described below:
(1) converter smelting, LF+RH duplex technique smelting procedure: are used；
(2) continuous casting working procedure: molten steel obtains continuous casting billet, continuous casting billet chemical component composition and its mass percentage through continuous casting after smelting
It is shown in Table 1；
(3) hot-rolled process: by heating of plate blank to 1247 DEG C, finishing temperature control is cold by laminar cooling system after rolling at 886 DEG C
But it is batched to 650 DEG C, 19 DEG C/s of cooling rate；
(4) cold rolling process: cold rolling reduction ratio is controlled 54.7%；
(5) annealing operation: annealing way uses continuous annealing, and strip is heated to 832 DEG C with the rate of heat addition of 2.5 DEG C/s, is protected
It is then ultrafast cold using water cooling with 2.8 DEG C/s slow cooling to 707 DEG C after warm 135s, it is cooled to 55 fastly with the cooling rate of 141 DEG C/s
DEG C, then 250 DEG C of progress Wetted constructures 333s are heated to the rate of heat addition of 23 DEG C/s；
(6) smooth process: smooth elongation percentage is 0.55%.
1000MPa grades of the present embodiment ultrafast cold cold-rolled biphase steel plate mechanical properties are shown in Table 2；Metallographic structure figure is shown in Figure 10, by
Figure 10 visible tissue is ferrite+martensite duplex structure.
1 1000MPa grades of table ultrafast cold cold-rolled biphase steel plate chemical component composition and mass percentage
Ingredient surplus is Fe and inevitable impurity in table 1.
2 1000MPa grades of table ultrafast cold cold-rolled biphase steel plate mechanical property
1000MPa grades of the present invention ultrafast cold cold-rolled biphase steel plate excellent in mechanical performance, tensile strength reach as can be seen from Table 2
1000MPa or more.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (9)
1. a kind of 1000MPa grades of ultrafast cold cold-rolled biphase steel plate, which is characterized in that the steel plate chemical component composition and its quality
Percentage composition are as follows: C:0.1~0.15%, Si:0.3~0.9%, Mn:1.6~2.2%, P≤0.015, S≤0.008%, Als:0.03
~0.06%, Nb:0.02~0.05%, N≤0.005%, remaining is Fe and inevitable impurity.
2. a kind of 1000MPa grades of ultrafast cold cold-rolled biphase steel plates according to claim 1, which is characterized in that the steel plate
Yield strength: 600~800MPa, tensile strength: 1000~1150MPa, elongation percentage: 10~18%.
3. based on a kind of preparation method of 1000MPa grades of ultrafast cold cold-rolled biphase steel plate of any of claims 1 or 2, feature
It is, the preparation method includes smelting, continuous casting, hot rolling, cold rolling, annealing, smooth process；The annealing operation, rapid cooling section are adopted
It is ultrafast cold with water cooling, it is cooled to 50-60 DEG C fastly with the cooling rate of 120~150 DEG C/s.
4. a kind of preparation method of 1000MPa grades of ultrafast cold cold-rolled biphase steel plates according to claim 3, feature exist
In, strip is heated to 820~850 DEG C with the rate of heat addition of 1~3 DEG C/s using continuous annealing process by the annealing operation,
It is then ultrafast cold using water cooling with 2~4 DEG C/s slow cooling to 690~720 DEG C after 120~150s of heat preservation, with 120~150 DEG C/s's
Cooling rate is cooled to 50-60 DEG C fastly, then with the rate of heat addition of 20~30 DEG C/s be heated to 250 DEG C of progress Wetted constructures 250~
400s。
5. a kind of preparation method of 1000MPa grades of ultrafast cold cold-rolled biphase steel plates according to claim 3, feature exist
In the smelting procedure, using converter smelting, LF+RH duplex technique.
6. a kind of preparation method of 1000MPa grades of ultrafast cold cold-rolled biphase steel plate according to claim 3-5 any one,
It is characterized in that, the continuous casting working procedure, molten steel obtains continuous casting billet, continuous casting billet chemical component composition and its quality through continuous casting after smelting
Percentage composition are as follows: C:0.1~0.15%, Si:0.3~0.9%, Mn:1.6~2.2%, P≤0.015, S≤0.008%, Als:0.03
~0.06%, Nb:0.02~0.05%, N≤0.005%, remaining is Fe and inevitable impurity.
7. a kind of preparation method of 1000MPa grades of ultrafast cold cold-rolled biphase steel plate according to claim 3-5 any one,
It is characterized in that, the hot-rolled process, by heating of plate blank to 1230~1270 DEG C, finishing temperature control is rolled at 880~910 DEG C
It is cooled to 600~650 DEG C by laminar cooling system afterwards to batch, 15~20 DEG C/s of cooling rate.
8. a kind of preparation method of 1000MPa grades of ultrafast cold cold-rolled biphase steel plate according to claim 3-5 any one,
It is characterized in that, the cold rolling process, cold rolling reduction ratio is controlled 50~60%.
9. a kind of preparation method of 1000MPa grades of ultrafast cold cold-rolled biphase steel plate according to claim 3-5 any one,
It is characterized in that, the smooth process, smooth elongation percentage is 0.4~0.7%.
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| CN110592471A (en) * | 2019-08-26 | 2019-12-20 | 邯郸钢铁集团有限责任公司 | 1200 MPa-grade cold-rolled martensite steel plate and preparation method thereof |
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| CN112322975A (en) * | 2020-10-27 | 2021-02-05 | 北京首钢股份有限公司 | Steel for ultrahigh-strength cold-rolled carriage plate and manufacturing method thereof |
| CN112481552A (en) * | 2020-11-11 | 2021-03-12 | 鞍钢股份有限公司 | 1000 MPa-grade cold-rolled sheet steel for automobiles and ultra-fast cooling production method |
| CN112481553A (en) * | 2020-11-11 | 2021-03-12 | 鞍钢股份有限公司 | 1000 MPa-grade automobile steel with good hardenability and ultra-fast cooling production method |
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