CN109628846A - 1300MPa grades of automobile super high tensile cold-rolled steel plates and its production method - Google Patents
1300MPa grades of automobile super high tensile cold-rolled steel plates and its production method Download PDFInfo
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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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
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- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
- 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 1300MPa grades of automobile super high tensile cold-rolled steel plate and its production method, the chemical component compositions and mass percentage of steel plate are as follows: C:0.2~0.3%, Mn:1.3~2.0%, S≤0.005%, P≤0.02%, Si:0.2~0.3%, Als≤0.08%, Nb:0.01~0.03%, Ti:0.04~0.08%, B:0.001~0.004%, Mo:0.2~0.3%, Cr:0.05~0.10%, V:0.01~0.02%, surplus are Fe and other inevitable impurity；Production method include steel-making, continuous casting, hot rolling, acid roll, continuous annealing, levelling withdrowal straightening process.Cold-rolled steel sheet good mechanical performance of the present invention, yield strength >=850MPa, tensile strength >=1300MPa, elongation percentage >=7% have good cold forming capability.
Description
Technical field
The invention belongs to metallurgical technology field, in particular to a kind of 1300MPa grades of automobile super high tensile cold-rolled steel plate and
Its production method.
Background technique
In recent years, in order to meet the needs of the energy-saving and environmental protection of automobile loss of weight and safety, the exploitation of high-strength automobile steel with grind
Study carefully one of the key issues of always steel material research field.It is double compared to the second generation, the advanced high-strength automobile steel of the third generation
Phase steel is because its production cost is low and has that yield tensile ratio is low, elongation percentage is high, processing hardening is obvious, easy stamping, good plasticity
With toughness matching etc. various features, be the Typical Representative of the advanced high-strength automobile steel of the first generation, the accounting in automobile high-strength steel
It is maximum.
The microscopic structure of dual phase steel automobile panel products is made of ferrite and martensite, and martensitic structure is with island disperse point
For cloth on ferrite matrix, the intensity and proportion of martensitic phase determine the intensity rank of dual phase steel.Currently, high-strength two-phase
The research of steel focus mostly on DP1180 intensity rank and hereinafter, with steel and iron industry and body of a motor car manufacturing technology progress, by force
Spend the advanced high-strength steel of 1300MPa and its above rank in Auto-body manufacturing using more and more.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of 1300MPa grades of automobile super high tensile cold-rolled steel plate and its lifes
Production method.There is the steel plate of invention production good plasticity and toughness to match, forming property is good, manufacturing cost is low, technique is simple
Single, stability height, can bring considerable economic benefit.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of 1300MPa grades of automobile superelevation is strong
Spend cold-rolled steel sheet, the chemical component composition and its mass percentage of the steel plate are as follows: C:0.2~0.3%, Mn:1.3~2.0%,
S≤0.005%, P≤0.02%, Si:0.2~0.3%, Als≤0.08%, Nb:0.01~0.03%, Ti:0.04~0.08%, B:
0.001~0.004%, Mo:0.2~0.3%, Cr:0.05~0.10%, V:0.01~0.02%, surplus are Fe and other can not keep away
The impurity exempted from.
The thickness specification of steel plate of the present invention is 0.8~2.0mm；Microscopic structure is made of ferrite and martensite, horse
Family name's body tissue is with island Dispersed precipitate on ferrite matrix.
Yield strength >=850MPa of steel plate of the present invention, tensile strength >=1300MPa, elongation percentage A80 >=7%.
The present invention also provides a kind of production method of 1300MPa grades of automobile super high tensile cold-rolled steel plate, the productions
Method include steel-making, continuous casting, hot rolling, acid roll, continuous annealing, levelling withdrowal straightening process；The hot-rolled process, slab heating temperature >=
1200 DEG C, roughing rolls 28~40mm of workpiece thickness after 3~7 passages, roughing, 1020~1100 DEG C of finish rolling inlet temperature, whole
Roll 820~900 DEG C of temperature, 550~650 DEG C of coiling temperature.
Steel making working procedure of the present invention, including desulfurizing iron is skimmed, the refining of converter smelting, LF furnace, RH application of vacuum.
Continuous casting working procedure of the present invention controls steel slab surface and internal soundness, prevents steel slab surface from going out in casting process
Existing micro-crack and secondary crackle.
Acid of the present invention rolls process, and cold rolling, cold rolling reduction ratio >=45% are carried out after pickling.
Continuous annealing process of the present invention, soaking zone holding temperature are 760~840 DEG C, and soaking time is 60~225s；
Overaging section holding temperature is 250~320 DEG C, and overaging section soaking time is 300~1225s.
Levelling withdrowal straightening process of the present invention, smooth elongation percentage are 0.1~0.4%.
1300MPa grades of automobile super high tensile cold-rolled steel plate method for testing performance canonical reference GB/T 228.1- of the present invention
2010。
The beneficial effects of adopting the technical scheme are that the design of 1, present component uses C, Mn and Mo element
The harden ability for improving steel, guarantees the intensity of strip；Microalloying is carried out using Nb, V, Ti simultaneously, is mentioned using refined crystalline strengthening effect
High-yield strength and toughness；While reaching superhigh intensity, preferable elongation percentage is maintained, avoiding excessive Nb element causes
Elongation percentage decline, have the characteristics that high comprehensive performance, inexpensive.2, the method for the present invention by steel-making, continuous casting, hot rolling,
Acid rolls, continuous annealing, the control of levelling withdrowal straightening process, and production has good plasticity and the matched automobile superhigh intensity cold rolling of toughness
Steel plate has low cost, stable production process, the feature that end properties are excellent, stable.3, automobile obtained by the method for the present invention is super
High strength cold rolled steel plate good mechanical performance, yield strength >=850MPa, tensile strength >=1300MPa, elongation percentage >=7% have
Good cold forming capability.
Detailed description of the invention
Fig. 1 is the metallographic structure figure of 1 automobile super high tensile cold-rolled steel plate of embodiment；
Fig. 2 is the stress strain curve figure of 1 automobile super high tensile cold-rolled steel plate of embodiment.
Specific embodiment
Present invention will be explained in further detail in the following with reference to the drawings and specific embodiments.
Embodiment 1
1300MPa grades of automobile super high tensile cold-rolled steel plates of the present embodiment are with a thickness of 0.8mm, chemical component composition and quality hundred
Point content is shown in Table 1.
The production method of 1300MPa grades of automobile super high tensile cold-rolled steel plates of the present embodiment include steel-making, continuous casting, hot rolling,
Acid rolls, continuous annealing, levelling withdrowal straightening process, and specific process step is as described below:
(1) steel making working procedure: steel-making includes that desulfurizing iron is skimmed, converter smelting, LF furnace refine, RH application of vacuum；
(2) in casting process, steel slab surface and internal soundness continuous casting working procedure: are controlled；
(3) hot-rolled process: 1250 DEG C of slab heating temperature；Roughing rolls 5 passages, workpiece thickness 34mm after roughing；Finish rolling into
1050 DEG C of temperature, 820 DEG C of finishing temperature, 580 DEG C of coiling temperature of mouth；
(4) acid rolls process: cold rolling, cold rolling reduction ratio 45% are carried out after pickling；
(5) continuous annealing process: soaking zone holding temperature is 820 DEG C, soaking time 100s；Overaging section holding temperature is
250 DEG C, overaging section soaking time is 1000s；
(6) levelling withdrowal straightening process: smooth elongation percentage is 0.20%.
The performance indicator of 1300MPa grades of automobile super high tensile cold-rolled steel plates of the present embodiment is shown in Table 2；Microscopic structure is by iron element
Body and martensite composition, martensitic structure is with island Dispersed precipitate on ferrite matrix.
Fig. 1 is shown in the metallographic structure of 1300MPa grades of automobile super high tensile cold-rolled steel plates obtained by the present embodiment；Superhigh intensity is cold
The stress strain curve of rolled steel plate is shown in Fig. 2.(metallographic structure figure of embodiment 2-8 automobile super high tensile cold-rolled steel plate is similar with Fig. 1,
Therefore it omits；The stress strain curve figure of embodiment 2-8 automobile super high tensile cold-rolled steel plate is similar with Fig. 2, therefore omits.)
Embodiment 2
1300MPa grades of automobile super high tensile cold-rolled steel plates of the present embodiment are with a thickness of 1.0mm, chemical component composition and quality hundred
Point content is shown in Table 1.
The production method of 1300MPa grades of automobile super high tensile cold-rolled steel plates of the present embodiment include steel-making, continuous casting, hot rolling,
Acid rolls, continuous annealing, levelling withdrowal straightening process, and specific process step is as described below:
(1) steel making working procedure: steel-making includes that desulfurizing iron is skimmed, converter smelting, LF furnace refine, RH application of vacuum；
(2) in casting process, steel slab surface and internal soundness continuous casting working procedure: are controlled；
(3) hot-rolled process: 1220 DEG C of slab heating temperature；Roughing rolls 5 passages, workpiece thickness 38mm after roughing；Finish rolling into
1060 DEG C of temperature, 835 DEG C of finishing temperature, 550 DEG C of coiling temperature of mouth；
(4) acid rolls process: cold rolling, cold rolling reduction ratio 55% are carried out after pickling；
(5) continuous annealing process: soaking zone holding temperature is 760 DEG C, soaking time 225s；Overaging section holding temperature is
295 DEG C, overaging section soaking time is 300s；
(6) levelling withdrowal straightening process: smooth elongation percentage is 0.40%.
The performance indicator of 1300MPa grades of automobile super high tensile cold-rolled steel plates of the present embodiment is shown in Table 2；Microscopic structure is by iron element
Body and martensite composition, martensitic structure is with island Dispersed precipitate on ferrite matrix.
Embodiment 3
1300MPa grades of automobile super high tensile cold-rolled steel plates of the present embodiment are with a thickness of 2.0mm, chemical component composition and quality hundred
Point content is shown in Table 1.
The production method of 1300MPa grades of automobile super high tensile cold-rolled steel plates of the present embodiment include steel-making, continuous casting, hot rolling,
Acid rolls, continuous annealing, levelling withdrowal straightening process, and specific process step is as described below:
(1) steel making working procedure: steel-making includes that desulfurizing iron is skimmed, converter smelting, LF furnace refine, RH application of vacuum；
(2) in casting process, steel slab surface and internal soundness continuous casting working procedure: are controlled；
(3) hot-rolled process: 1200 DEG C of slab heating temperature；Roughing rolls 3 passages, workpiece thickness 40mm after roughing；Finish rolling into
1100 DEG C of temperature, 900 DEG C of finishing temperature, 620 DEG C of coiling temperature of mouth；
(4) acid rolls process: cold rolling, cold rolling reduction ratio 45% are carried out after pickling；
(5) continuous annealing process: soaking zone holding temperature is 800 DEG C, soaking time 150s；Overaging section holding temperature is
280 DEG C, overaging section soaking time is 600s；
(6) levelling withdrowal straightening process: smooth elongation percentage is 0.20%.
The performance indicator of 1300MPa grades of automobile super high tensile cold-rolled steel plates of the present embodiment is shown in Table 2；Microscopic structure is by iron element
Body and martensite composition, martensitic structure is with island Dispersed precipitate on ferrite matrix.
Embodiment 4
1300MPa grades of automobile super high tensile cold-rolled steel plates of the present embodiment are with a thickness of 1.5mm, chemical component composition and quality hundred
Point content is shown in Table 1.
The production method of 1300MPa grades of automobile super high tensile cold-rolled steel plates of the present embodiment include steel-making, continuous casting, hot rolling,
Acid rolls, continuous annealing, levelling withdrowal straightening process, and specific process step is as described below:
(1) steel making working procedure: steel-making includes that desulfurizing iron is skimmed, converter smelting, LF furnace refine, RH application of vacuum；
(2) in casting process, steel slab surface and internal soundness continuous casting working procedure: are controlled；
(3) hot-rolled process: 1245 DEG C of slab heating temperature；Roughing rolls 5 passages, workpiece thickness 34mm after roughing；Finish rolling into
1040 DEG C of temperature, 845 DEG C of finishing temperature, 650 DEG C of coiling temperature of mouth；
(4) acid rolls process: cold rolling, cold rolling reduction ratio 50% are carried out after pickling；
(5) continuous annealing process: soaking zone holding temperature is 780 DEG C, soaking time 180s；Overaging section holding temperature is
270 DEG C, overaging section soaking time is 500s；
(6) levelling withdrowal straightening process: smooth elongation percentage is 0.15%.
The performance indicator of 1300MPa grades of automobile super high tensile cold-rolled steel plates of the present embodiment is shown in Table 2；Microscopic structure is by iron element
Body and martensite composition, martensitic structure is with island Dispersed precipitate on ferrite matrix.
Embodiment 5
1300MPa grades of automobile super high tensile cold-rolled steel plates of the present embodiment are with a thickness of 1.2mm, chemical component composition and quality hundred
Point content is shown in Table 1.
The production method of 1300MPa grades of automobile super high tensile cold-rolled steel plates of the present embodiment include steel-making, continuous casting, hot rolling,
Acid rolls, continuous annealing, levelling withdrowal straightening process, and specific process step is as described below:
(1) steel making working procedure: steel-making includes that desulfurizing iron is skimmed, converter smelting, LF furnace refine, RH application of vacuum；
(2) in casting process, steel slab surface and internal soundness continuous casting working procedure: are controlled；
(3) hot-rolled process: 1265 DEG C of slab heating temperature；Roughing rolls 5 passages, workpiece thickness 32mm after roughing；Finish rolling into
1055 DEG C of temperature, 880 DEG C of finishing temperature, 600 DEG C of coiling temperature of mouth；
(4) acid rolls process: cold rolling, cold rolling reduction ratio 60% are carried out after pickling；
(5) continuous annealing process: soaking zone holding temperature is 840 DEG C, soaking time 60s；Overaging section holding temperature is 320
DEG C, overaging section soaking time is 900s；
(6) levelling withdrowal straightening process: smooth elongation percentage is 0.40%.
The performance indicator of 1300MPa grades of automobile super high tensile cold-rolled steel plates of the present embodiment is shown in Table 2；Microscopic structure is by iron element
Body and martensite composition, martensitic structure is with island Dispersed precipitate on ferrite matrix.
Embodiment 6
1300MPa grades of automobile super high tensile cold-rolled steel plates of the present embodiment are with a thickness of 1.3mm, chemical component composition and quality hundred
Point content is shown in Table 1.
The production method of 1300MPa grades of automobile super high tensile cold-rolled steel plates of the present embodiment include steel-making, continuous casting, hot rolling,
Acid rolls, continuous annealing, levelling withdrowal straightening process, and specific process step is as described below:
(1) steel making working procedure: steel-making includes that desulfurizing iron is skimmed, converter smelting, LF furnace refine, RH application of vacuum；
(2) in casting process, steel slab surface and internal soundness continuous casting working procedure: are controlled；
(3) hot-rolled process: 1290 DEG C of slab heating temperature；Roughing rolls 7 passages, workpiece thickness 28mm after roughing；Finish rolling into
1020 DEG C of temperature, 840 DEG C of finishing temperature, 560 DEG C of coiling temperature of mouth；
(4) acid rolls process: cold rolling, cold rolling reduction ratio 65% are carried out after pickling；
(5) continuous annealing process: soaking zone holding temperature is 790 DEG C, soaking time 170s；Overaging section holding temperature is
300 DEG C, overaging section soaking time is 1225s；
(6) levelling withdrowal straightening process: smooth elongation percentage is 0.25%.
The performance indicator of 1300MPa grades of automobile super high tensile cold-rolled steel plates of the present embodiment is shown in Table 2；Microscopic structure is by iron element
Body and martensite composition, martensitic structure is with island Dispersed precipitate on ferrite matrix.
Embodiment 7
1300MPa grades of automobile super high tensile cold-rolled steel plates of the present embodiment are with a thickness of 1.8mm, chemical component composition and quality hundred
Point content is shown in Table 1.
The production method of 1300MPa grades of automobile super high tensile cold-rolled steel plates of the present embodiment include steel-making, continuous casting, hot rolling,
Acid rolls, continuous annealing, levelling withdrowal straightening process, and specific process step is as described below:
(1) steel making working procedure: steel-making includes that desulfurizing iron is skimmed, converter smelting, LF furnace refine, RH application of vacuum；
(2) in casting process, steel slab surface and internal soundness continuous casting working procedure: are controlled；
(3) hot-rolled process: 1237 DEG C of slab heating temperature；Roughing rolls 3 passages, workpiece thickness 30mm after roughing；Finish rolling into
1072 DEG C of temperature, 868 DEG C of finishing temperature, 635 DEG C of coiling temperature of mouth；
(4) acid rolls process: cold rolling, cold rolling reduction ratio 48% are carried out after pickling；
(5) continuous annealing process: soaking zone holding temperature is 772 DEG C, soaking time 85s；Overaging section holding temperature is 261
DEG C, overaging section soaking time is 724s；
(6) levelling withdrowal straightening process: smooth elongation percentage is 0.10%.
The performance indicator of 1300MPa grades of automobile super high tensile cold-rolled steel plates of the present embodiment is shown in Table 2；Microscopic structure is by iron element
Body and martensite composition, martensitic structure is with island Dispersed precipitate on ferrite matrix.
Embodiment 8
1300MPa grades of automobile super high tensile cold-rolled steel plates of the present embodiment are with a thickness of 1.4mm, chemical component composition and quality hundred
Point content is shown in Table 1.
The production method of 1300MPa grades of automobile super high tensile cold-rolled steel plates of the present embodiment include steel-making, continuous casting, hot rolling,
Acid rolls, continuous annealing, levelling withdrowal straightening process, and specific process step is as described below:
(1) steel making working procedure: steel-making includes that desulfurizing iron is skimmed, converter smelting, LF furnace refine, RH application of vacuum；
(2) in casting process, steel slab surface and internal soundness continuous casting working procedure: are controlled；
(3) hot-rolled process: 1278 DEG C of slab heating temperature；Roughing rolls 7 passages, workpiece thickness 36mm after roughing；Finish rolling into
1086 DEG C of temperature, 859 DEG C of finishing temperature, 572 DEG C of coiling temperature of mouth；
(4) acid rolls process: cold rolling, cold rolling reduction ratio 57% are carried out after pickling；
(5) continuous annealing process: soaking zone holding temperature is 815 DEG C, soaking time 125s；Overaging section holding temperature is
312 DEG C, overaging section soaking time is 1138s；
(6) levelling withdrowal straightening process: smooth elongation percentage is 0.32%.
The performance indicator of 1300MPa grades of automobile super high tensile cold-rolled steel plates of the present embodiment is shown in Table 2；Microscopic structure is by iron element
Body and martensite composition, martensitic structure is with island Dispersed precipitate on ferrite matrix.
The chemical component of 1 embodiment 1-8 automobile super high tensile cold-rolled steel plate of table form and
Mass percentage (%)
Ingredient surplus is Fe and other inevitable impurity in table 1.
The performance indicator of 2 embodiment 1-8 automobile super high tensile cold-rolled steel plate of table
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 the present invention into
Go detailed description, those skilled in the art should understand that: it can still modify to the present invention or equally replace
It changes, without departing from the spirit or scope of the invention, or any substitutions, should all cover and be wanted in right of the invention
It asks in range.
Claims (7)
1. a kind of 1300MPa grades of automobile super high tensile cold-rolled steel plate, which is characterized in that the chemical component of the steel plate form and
Its mass percentage are as follows: C:0.2~0.3%, Mn:1.3~2.0%, S≤0.005%, P≤0.02%, Si:0.2~0.3%, Als
≤ 0.08%, Nb:0.01~0.03%, Ti:0.04~0.08%, B:0.001~0.004%, Mo:0.2~0.3%, Cr:0.05~
0.10%, V:0.01~0.02%, surplus are Fe and other inevitable impurity.
2. a kind of 1300MPa grades of automobile super high tensile cold-rolled steel plates according to claim 1, which is characterized in that described
The thickness specification of steel plate is 0.8~2.0mm, and microscopic structure is made of ferrite and martensite.
3. a kind of 1300MPa grades of automobile super high tensile cold-rolled steel plates according to claim 1, which is characterized in that described
Yield strength >=850MPa of steel plate, tensile strength >=1300MPa, elongation percentage A80 >=7%.
4. the production based on a kind of 1300MPa grades of automobile super high tensile cold-rolled steel plate described in claim 1-3 any one
Method, which is characterized in that the production method include steel-making, continuous casting, hot rolling, acid roll, continuous annealing, levelling withdrowal straightening process；Institute
Hot-rolled process, slab heating temperature >=1200 DEG C are stated, roughing rolls 28~40mm of workpiece thickness after 3~7 passages, roughing, essence
Roll 1020~1100 DEG C of inlet temperature, 820~900 DEG C of finishing temperature, 550~650 DEG C of coiling temperature.
5. a kind of production method of 1300MPa grades of automobile super high tensile cold-rolled steel plates according to claim 4, feature
It is, the acid rolls process, and cold rolling, cold rolling reduction ratio >=45% are carried out after pickling.
6. a kind of production method of 1300MPa grades of automobile super high tensile cold-rolled steel plates according to claim 4, feature
It is, the continuous annealing process, soaking zone holding temperature is 760~840 DEG C, and soaking time is 60~225s；Overaging section
Holding temperature is 250~320 DEG C, and overaging section soaking time is 300~1225s.
7. a kind of production of 1300MPa grades of automobile super high tensile cold-rolled steel plate according to claim 4-6 any one
Method, which is characterized in that the levelling withdrowal straightening process, smooth elongation percentage are 0.1~0.4%.
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