CN109280857A - A kind of 1200MPa grades of ultrafast cold cold-rolled biphase steel plate and preparation method thereof - Google Patents
A kind of 1200MPa grades of ultrafast cold cold-rolled biphase steel plate and preparation method thereof Download PDFInfo
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- CN109280857A CN109280857A CN201811119888.5A CN201811119888A CN109280857A CN 109280857 A CN109280857 A CN 109280857A CN 201811119888 A CN201811119888 A CN 201811119888A CN 109280857 A CN109280857 A CN 109280857A
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- 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
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- 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
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- 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
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- 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
- C21D8/0242—Flattening; Dressing; Flexing
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
- C21D2211/008—Martensite
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Abstract
The invention discloses a kind of 1200MPa 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:0.12~0.17%, Si:0.3~0.6%, Mn:2.0~2.4%, P≤0.015%, S≤0.008%, Als:0.03~0.06%, Ti:0.03~0.06%, 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 Ti microalloying low-alloy ingredient, ultrafast cold using continuous annealing process water cooling, improves steel plate harden ability, obtain ferrite+martensite duplex structure pattern cold-rolled biphase steel, structure property is uniform, and tensile strength reaches 1200MPa or more, excellent in mechanical performance.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of 1200MPa grades of ultrafast cold cold-rolled biphase steel plate and its system
Preparation Method.
Background technique
1200MPa grades of cold-rolled biphase steels are due to low yield tensile ratio, high initial manufacture hardening rate, intensity and ductility
The advantages that good fit, has been developed as a kind of good high-tensile structural steel of formability, and microscopic structure is mainly by softer
Ferrite matrix and a small amount of hard martensitic phase composition, which, which can be heat-treated and be controlled through critical zone by low-alloy steel, roll
Technique processed obtains, and the compound structural state of this two-phase makes it have good strong plasticity matching and cold deformation energy, extensive
Applied to structural member, reinforcer and anti-striker.
Since 1200MPa grades of cold-rolled biphase steels are to obtain sufficiently high intensity, generally require to add in traditional handicraft ingredient
Add more alloying element, this its smelting, hot rolling, acid each link producting process difficulty such as roll to increase, it is steady to be unfavorable for the steel grade
Fixed production, and production cost is higher.
By a kind of tensile strength 1200MPa grades of cold-rolled biphase steel plates of update search to Publication No. 103556048A and
The patent of invention of preparation method, it is characterised in that the cold-rolled biphase steel plate chemical component composition and weight percent are as follows: C:
0.19~0.21%, Si:0.7~0.9%, Mn:1.9~2.1%, Cr:0.01~0.02%, Nb:0.02~0.04%, P≤
0.005%, S≤0.003%, surplus are Fe and inevitable impurity.The advantages of steel is tensile strength in 1200MPa or more,
Crystallite dimension reaches 2~3 μm, and yield tensile ratio is 0.5~0.6, and elongation percentage is 8% or more, and Martensite Volume Fraction is 58~68%.It should
The problem of steel is that C, Si weight percent are higher, is unfavorable for welding and quality control on the surface.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of 1200MPa grades ultrafast cold cold-rolled biphase steel plate and its preparation sides
Method.The invention, without Cr, Mo component system, reduces rolled steel plate harden ability and intensity using low-carbon, improves acid and rolls production stabilization
Property, by ultrafast cold technique, the strong dual phase steel of inexpensive superelevation with superperformance, product tool are obtained in conjunction with Controlled Rolling And Controlled Cooling
There are preferable market prospects.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of 1200MPa grades of ultrafast cold rolling two-phase
Steel plate, the steel plate chemical component composition and its mass percentage are as follows: C:0.12~0.17%, Si:0.3~0.6%, Mn:2.0
~2.4%, P≤0.015%, S≤0.008%, Als:0.03~0.06%, Ti:0.03~0.06%, N≤0.005%, remaining is Fe
And inevitable impurity.
Steel plate yield strength of the present invention: 820~950MPa, tensile strength: 1200~1350MPa, elongation percentage: 5~
10%。
The present invention also provides the preparation method of a kind of 1200MPa 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 130
The cooling rate of~150 DEG C/s is cooled to 50~60 DEG C fastly.
Strip is heated to using continuous annealing process with the rate of heat addition of 1~3 DEG C/s by annealing operation of the present invention
810~840 DEG C, keep the temperature 120~150s after with 2~4 DEG C/s slow cooling to 700~730 DEG C, then using water cooling it is ultrafast cold, with 130
The cooling rate of~150 DEG C/s is cooled to 50~60 DEG C fastly, then with the rate of heat addition of 20~30 DEG C/s to be heated to 250 DEG C of progress out-of-date
200~400s of effect processing.
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:0.12~0.17%, Si:0.3~0.6%, Mn:2.0~2.4%, P≤0.015%, S≤0.008%,
Als:0.03~0.06%, Ti:0.03~0.06%, N≤0.005%, remaining is Fe and inevitable impurity.
Hot-rolled process of the present invention, by heating of plate blank to 1220~1260 DEG C, finishing temperature control at 850~880 DEG C,
It is cooled to 580~630 DEG C by laminar cooling system after rolling to batch, 15~20 DEG C/s of cooling rate.
Cold rolling process of the present invention, cold rolling reduction ratio are controlled 50~60%.
Smooth process of the present invention, smooth elongation percentage are 0.3~0.6%.
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 0.12~0.17% that the present invention, which selects C content, and C content is too low,
Then it cannot be guaranteed that 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 0.3~0.6%, 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 2.0~2.4% that the present invention, which selects Mn content,.
Ti: titanium can form Austenite Grain Growth when TiN prevents to heat with nitrogen, refine original grain when open rolling.It rolls
The recrystallization process of austenite, final fining ferrite can be blocked when processed in Ti (CN) particle that austenite high-temperature region is precipitated
Crystal grain, micro Ti is added into steel can refine crystal grain and improve intensity.It is 0.03~0.06% that the present invention, which selects Ti content,.
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%.
1200MPa 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 Ti 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, the inexpensive cold-rolled biphase steel of ferrite+martensite duplex structure pattern, the sense of organization are obtained
Can uniformly, 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 1200MPa grade of embodiment 1；
Fig. 2 is the ultrafast cold cold-rolled biphase steel plate metallographic structure figure (1000 times) of 1200MPa grade of embodiment 2；
Fig. 3 is the ultrafast cold cold-rolled biphase steel plate metallographic structure figure (1000 times) of 1200MPa grade of embodiment 3；
Fig. 4 is the ultrafast cold cold-rolled biphase steel plate metallographic structure figure (1000 times) of 1200MPa grade of embodiment 4；
Fig. 5 is the ultrafast cold cold-rolled biphase steel plate metallographic structure figure (1000 times) of 1200MPa grade of embodiment 5；
Fig. 6 is the ultrafast cold cold-rolled biphase steel plate metallographic structure figure (1000 times) of 1200MPa grade of embodiment 6；
Fig. 7 is the ultrafast cold cold-rolled biphase steel plate metallographic structure figure (1000 times) of 1200MPa grade of embodiment 7；
Fig. 8 is the ultrafast cold cold-rolled biphase steel plate metallographic structure figure (1000 times) of 1200MPa grade of embodiment 8；
Fig. 9 is the ultrafast cold cold-rolled biphase steel plate metallographic structure figure (1000 times) of 1200MPa grade of embodiment 9；
Figure 10 is the ultrafast cold cold-rolled biphase steel plate metallographic structure figure (1000 times) of 1200MPa grade of embodiment 10.Specific embodiment party
Formula
Present invention will be explained in further detail in the following with reference to the drawings and specific embodiments.
Embodiment 1
1200MPa 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 1200MPa 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 1220 DEG C, finishing temperature control is cold by laminar cooling system after rolling at 850 DEG C
But it is batched to 630 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 810 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 150s, it is cooled to 55 DEG C fastly with the cooling rate of 130 DEG C/s,
250 DEG C of progress Wetted constructures 400s are heated to the rate of heat addition of 20 DEG C/s again；
(6) smooth process: smooth elongation percentage is 0.6%.
1200MPa 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
1200MPa 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 1200MPa 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 1260 DEG C, finishing temperature control is cold by laminar cooling system after rolling at 880 DEG C
But it is batched to 580 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 707 DEG C after warm 120s, it is cooled to 55 DEG C fastly with the cooling rate of 150 DEG C/s,
250 DEG C of progress Wetted constructures 200s are heated to the rate of heat addition of 30 DEG C/s again；
(6) smooth process: smooth elongation percentage is 0.3%.
1200MPa 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
1200MPa 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 1200MPa 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 862 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 725 DEG C after warm 130s, 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 0.4%.
1200MPa 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
1200MPa 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 1200MPa 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 1236 DEG C, finishing temperature control is cold by laminar cooling system after rolling at 860 DEG C
But it is batched to 609 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 139 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 0.5%.
1200MPa 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
1200MPa 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 1200MPa 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 1227 DEG C, finishing temperature control is cold by laminar cooling system after rolling at 872 DEG C
But it is batched to 605 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 836 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 708 DEG C after warm 139s, it is cooled to 55 fastly with the cooling rate of 144 DEG C/s
DEG C, then 250 DEG C of progress Wetted constructures 295s are heated to the rate of heat addition of 29 DEG C/s；
(6) smooth process: smooth elongation percentage is 0.4%.
1200MPa 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
1200MPa 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 1200MPa 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 865 DEG C
But it is batched to 613 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 830 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 700 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 255s are heated to the rate of heat addition of 24 DEG C/s；
(6) smooth process: smooth elongation percentage is 0.6%.
1200MPa 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
1200MPa 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 1200MPa 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 880 DEG C
But it is batched to 580 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 728 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 376s are heated to the rate of heat addition of 23 DEG C/s again；
(6) smooth process: smooth elongation percentage is 0.5%.
1200MPa 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
1200MPa 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 1200MPa 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 1236 DEG C, finishing temperature control is cold by laminar cooling system after rolling at 865 DEG C
But it is batched to 621 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 350s are heated to the rate of heat addition of 21 DEG C/s；
(6) smooth process: smooth elongation percentage is 0.4%.
1200MPa 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
1200MPa 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 1200MPa 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 1260 DEG C, finishing temperature control is cold by laminar cooling system after rolling at 871 DEG C
But it is batched to 625 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 702 DEG C after warm 135s, it is cooled to 60 fastly with the cooling rate of 136 DEG C/s
DEG C, then 250 DEG C of progress Wetted constructures 360s are heated to the rate of heat addition of 26 DEG C/s；
(6) smooth process: smooth elongation percentage is 0.5%.
1200MPa 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
1200MPa 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 1200MPa 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 1227 DEG C, finishing temperature control is cold by laminar cooling system after rolling at 874 DEG C
But it is batched to 590 DEG C, 19 DEG C/s of cooling rate；
(4) cold rolling process: cold rolling reduction ratio is controlled 58.7%；
(5) annealing operation: annealing way uses continuous annealing, and strip is heated to 840 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 730 DEG C after warm 135s, it is cooled to 50 fastly with the cooling rate of 141 DEG C/s
DEG C, then 250 DEG C of progress Wetted constructures 364s are heated to the rate of heat addition of 23 DEG C/s；
(6) smooth process: smooth elongation percentage is 0.3%.
1200MPa 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 1200MPa 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 1200MPa grades of table ultrafast cold cold-rolled biphase steel plate mechanical property
1200MPa 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
1200MPa 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 1200MPa 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:0.12~0.17%, Si:0.3~0.6%, Mn:2.0~2.4%, P≤0.015%, S≤0.008%, Als:
0.03~0.06%, Ti:0.03~0.06%, N≤0.005%, remaining is Fe and inevitable impurity.
2. a kind of 1200MPa grades of ultrafast cold cold-rolled biphase steel plates according to claim 1, which is characterized in that the steel plate
Yield strength: 820~950MPa, tensile strength: 1200~1350MPa, elongation percentage: 5~10%.
3. based on a kind of preparation method of 1200MPa 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 130~150 DEG C/s.
4. a kind of preparation method of 1200MPa grades of ultrafast cold cold-rolled biphase steel plates according to claim 3, feature exist
In, strip is heated to 810~840 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 700~730 DEG C after 120~150s of heat preservation, with 130~150 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 200~
400s。
5. a kind of preparation method of 1200MPa 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 1200MPa 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:0.12~0.17%, Si:0.3~0.6%, Mn:2.0~2.4%, P≤0.015%, S≤0.008%, Als:
0.03~0.06%, Ti:0.03~0.06%, N≤0.005%, remaining is Fe and inevitable impurity.
7. a kind of preparation method of 1200MPa 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 1220~1260 DEG C, finishing temperature control is rolled at 850~880 DEG C
It is cooled to 580~630 DEG C by laminar cooling system afterwards to batch, 15~20 DEG C/s of cooling rate.
8. a kind of preparation method of 1200MPa 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 1200MPa 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 0.3~0.6%.
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