CN109898017A - Cold-rolled dual-phase steel with excellent 1000 MPa-level cold bending performance and production method thereof - Google Patents
Cold-rolled dual-phase steel with excellent 1000 MPa-level cold bending performance and production method thereof Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
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- 239000010959 steel Substances 0.000 claims abstract description 70
- 238000000137 annealing Methods 0.000 claims abstract description 32
- 238000001816 cooling Methods 0.000 claims abstract description 20
- 238000005096 rolling process Methods 0.000 claims abstract description 20
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 5
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 5
- 238000005266 casting Methods 0.000 claims abstract description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 4
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 3
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 17
- 238000005097 cold rolling Methods 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 13
- 238000005098 hot rolling Methods 0.000 claims description 7
- 238000005516 engineering process Methods 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 238000005554 pickling Methods 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 2
- 238000004321 preservation Methods 0.000 abstract 1
- 230000002787 reinforcement Effects 0.000 abstract 1
- 229910001566 austenite Inorganic materials 0.000 description 17
- 229910000859 α-Fe Inorganic materials 0.000 description 14
- 229910052799 carbon Inorganic materials 0.000 description 10
- 239000000047 product Substances 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 229910000734 martensite Inorganic materials 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 4
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- 238000003466 welding Methods 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
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- 239000011159 matrix material Substances 0.000 description 2
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- 229910001257 Nb alloy Inorganic materials 0.000 description 1
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- 241001062472 Stokellia anisodon Species 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses cold-rolled dual-phase steel with excellent 1000 MPa-level cold bending performance and a production method thereof. The steel contains: c: 0.03% -0.20%, Si: 0.20-0.80%, Mn: 1.20-2.20%, Cr: 0.30% -0.60%, Nb: 0.020% -0.150%, Ni: 0.050% -0.100%, P < 0.020%, S < 0.015%, N < 0.0050%, Al: 0.020-0.150% and the balance of Fe and inevitable impurities. The heating temperature of a casting blank is 1180-1250 ℃, the initial rolling temperature of rough rolling is 1150-1050 ℃, the final rolling temperature of rough rolling is 1020-980 ℃, the initial rolling temperature of finish rolling is 940-1000 ℃, the final rolling temperature of finish rolling is 750-920 ℃, and the coiling temperature is 555-700 ℃; the annealing temperature is 740-840 ℃, the annealing heat preservation time is 60-200 s, the fast cooling speed is 25-40 ℃/s, the overaging time is 120-500 s, and the overaging temperature is 170-400 ℃. Steel sheets are used for automotive structural members and reinforcements.
Description
Technical field
The present invention relates to belong to cold-rolled high-strength automotive sheet technical field, in particular to a kind of structure as automobile
The cold-rolled biphase steel and production method of part and reinforcer.
Background technique
Dual phase steel (DP steel) is made of ferrite and martensite, has low yield strength ratio, high initial work hardening rate, good
The features such as intensity and extensibility cooperate, have evolved into a kind of automobile high-strength Punching Steel (AHSS).Ultralight steel body is ground
Study carefully project and show that dosage of the dual phase steel on future automobile vehicle body reaches 80%, has a good application prospect.To having ground at present
The cold rolling for studying carefully exploitation and hot dip galvanized dual phase steel intensity are from 450MPa to 1470MPa, the intensity level of the commercially viable supply of material of iron and steel enterprise
Not Wei DP450, DP590, DP780 and DP980, the components such as frame member, door anti-collision joist, bumper applied to automobile.
The external strong cold-rolled biphase steel continuous annealing process of superelevation mostly uses water quenching+tempering mode, and cooling capacity can reach
To 1000~2000 DEG C/s, consider to reduce harden ability alloying element, and cold using the slower air-cooling apparatus progress of cooling velocity
When but, alloying component is slightly higher, but is that steel plate is unlikely to deform the advantages of air cooling, and plate shape is good.
Currently, the cold-rolled biphase steel plate highest level of available stock reaches 1180MPa in the world, and also only water quenching+
It is produced in tempering continuous annealing line.Do not have the condition of unimach continuous annealing production line also for most domestic steel mill, such as
On the basis of where not using water quenching (cooling rate >=1000 DEG C/s)+tempering continuous annealing line, using the existing continuous annealing equipment of domestic steel mill, adopt
980MPa grades or more is produced with rapid cooling (50 DEG C/s of cooling rate <)+overaging method, there are low cost, high-strength plasticity, good welds
The strong cold-rolled biphase steel of the superelevation of performance and forming property becomes the emphasis of domestic scientific research personnel research.
CN 101363099A discloses a kind of cold rolled dual-phase sheet steel with 1000 MPa grade tensile strength and preparation method, using C-
Si-Mn-Nb alloy system, rapid cooling rate need to reach 40~50 DEG C/s.For producing the product of think gauge, rapid cooling rate almost reaches
Design to equipment is online, and annealing furnace cooling blower operating load weight can not achieve and stably produce.
CN101348885A discloses a kind of 1000MPa grade cold rolling hot dip galvanizing dual phase steel and its manufacturing method, using C-Si-
Mn-Cr-Mo-Nb-Ti alloy system obtains 1000MPa hot dip galvanized dual phase steel by hot dip galvanizing process.The production of this technology is hot dip
The alloying component of zinc two-phase steel product, use is complicated, and annealing process is zinc-plated annealing process, and the product of production is hot galvanizing
The two-phase steel product of surface state.
US6709535 B2 discloses the strong dual phase sheet steel (Supperhigh- of the excellent superelevation of fatigue properties of welded joints
strength dual phase steel sheet of excellent fatigue characteristic in a pot
Welded joint), using 0.18C-1.33Si-2.06Mn-0.43Mo, prepare 1000MPa grades of cold-rolled biphase steels, Si content
It is higher, it is also easy to produce red rust and striated surface defect in the hot rolling, difficult, final production is removed in subsequent pickling and cold-rolling
The surface quality of product is poor.And be added to 0.43% expensive alloy element Mo, increase production cost, do not have cost advantage.
Summary of the invention
It is an object of the invention to solve the above problem of the existing technology, providing one kind can be in industrial continuous annealing
Tensile strength is relatively easily produced on line in 1000MPa or more, elongation after fracture is greater than 10.0%, yield tensile ratio less than 0.55,
Cold-bending property is excellent and welding cold-rolled steel sheet and its manufacturing method.
Specific technical solution is:
A kind of constituent for the cold-rolled biphase steel that 1000MPa grades of cold-bending property is excellent contains in steel by mass percentage
Have: C:0.03%~0.20%, Si:0.20%~0.80%, Mn:1.20%~2.20%, Cr:0.30%~0.60%, Nb:
0.020%~0.150%, Ni:0.050%~0.100%, P < 0.020%, S < 0.015%, N≤0.0050%, Al:
0.020%~0.150%, surplus is Fe and inevitable impurity.
Each alloying element control principle of steel grade of the present invention is as follows:
For solubility of the C:C in austenite much larger than the solubility in ferrite, it can effectively extend austenite
Incubation period before transformation increases the low-temperature stability of austenite.The content of C element also directly influences dual phase steel after continuous annealing
The content of C and the structure type of geneva in the volume fraction of middle martensite, martensite, carbon content control exists in the present invention
0.03%~0.20%.
Si:Si is ferrite former, is easy to dissolve to ferrite, and can effectively improve C, Mn in ferrite
In chemical potential, in two-phase section annealing process, the addition of Si substantially speeds up the transfer of C, Mn into austenite, to increase indirectly
The stability of austenite.Si makes ferrite sufficiently " purification ", when avoiding a large amount of gaps solid solution and cooling of the C in ferrite
The generation of coarse carbide, but to avoid Si too high levels that surface of steel plate is caused to generate red rust, Si control of the present invention is 0.20%
~0.80%.
Mn:Mn is austenite stabilizer element, can effectively improve the harden ability of austenitic island, thus reduces two-phase section and add
After heat, cooling rate necessary to duplex structure obtained in cooling procedure.Mn can also reduce the solid solution C in ferrite, promote
It shifts C into austenite, purifies ferrite matrix while improving austenite harden ability, so that the ductility of dual phase steel is improved,
Therefore, Mn plays a significant role the formation of two-phase steel organization.But if Mn too high levels, carbon in austenite can be reduced
Activity can promote the formation of carbide instead, and high Mn content often causes casting aliquation, causes rolling strip-type group
It knits, Mn control of the present invention is 1.20%~2.20%.
Cr:Cr is ferrite former, similar to the effect of Si, facilitates ferritic formation, and then increase and do not change
The stability and harden ability of austenite.Cr can postpone perlitic transformation, reduce Bs point, inhibit bainitic transformation.In addition, Cr can
To promote C to spread to austenite, and ferritic yield strength can be reduced, be more advantageous to the dual phase steel for obtaining low yield strength.
In addition, solution strengthening ability of the Cr element in steel is small, excessive addition can reduce welding performance.Cr control of the present invention is 0.30%
~0.60%.
Nb replaces solute atoms presence in steel, is ferrite former, promotes austenite to ferrite transformation.Nb
Solid solution effect of dragging be suppressed Recrystallization nucleation, thus to recrystallization have strong interception.Nb is also simultaneously
Strong C, N compound formation element.Nb is introduced in dual phase steel, is used for fining ferrite grains, and strengthens iron element in the form of precipitate
Body matrix, but Nb, which is excessively added, can make precipitated phase reduce ferritic ductility, reduce the forming property of steel.Nb control of the present invention exists
0.020%~0.150%.
Ni is the effective element of austenitizing, and the AC of steel grade can be improved3Temperature makes C curve move right, and reduces the critical of steel
Cooling velocity improves the harden ability and intensity of steel, without reducing its plasticity.In addition, Ni can also improve the low-temperature flexibility of steel and resist
Fatigability, and make steel plate that there is certain corrosion resistance.Ni control of the present invention is 0.050%~0.100%.
Al is main deoxidier, while Al can also form AlN precipitation, play certain Grain refinement.In steel
When Al is added for deoxidation, unsuitable too low, otherwise Mn, Si etc. coarse oxide largely disperses in steel, deteriorates steel, but
Excessive tufted aluminium oxide inclusion increases, and so that the plasticity of steel and weldability is deteriorated, and will affect steel-making and continuous casting.This hair
Bright Al control is 0.020%~0.150%.
Nitride is precipitated in steel plate in N, helps to strengthen steel plate, but superfluous, then nitride is largely precipitated, and causes to extend
Rate, weldability deteriorate and the cold forming degradation of steel plate.N control of the present invention is below 0.0050%.
P, S are the harmful element in steel.P segregation easily on crystal boundary causes embrittlement, and S easily forms the field trashes such as MnS in steel,
The toughness plasticity of steel is set to be deteriorated.P of the present invention, S are controlled respectively in P < 0.020%, S < 0.015%.
The present invention also proposes a kind of production method of cold-rolled biphase steel that 1000MPa grades of cold-bending property is excellent, including smelt,
Casting, slab heating, hot rolling, pickling, cold rolling, annealing, specific as follows:
(1) pass through smelting procedure according to the chemical component of the requirement, obtain block；
(2) by the block by heating, hot-rolled process, be made hot rolled plate, wherein heating temperature be 1180~
1250 DEG C, roughing start rolling temperature is 1150~1050 DEG C, and roughing finishing temperature is 1020~980 DEG C, and finish rolling start rolling temperature is 940
~1000 DEG C, finish rolling finishing temperature is 750~920 DEG C, and coiling temperature is 555~700 DEG C；
(3) cold rolling after overpickling by the hot rolled plate, is made flat cold-rolled sheet；Cold rolling reduction ratio is 45%~75%；At
Product steel plate thickness is 0.9~2.0mm；
(4) flat cold-rolled sheet is passed through into annealing process, preparing finished articles steel plate；Wherein, annealing soaking time be 60~
200s, overaging time are 120~500s.
Wherein, in the annealing process, annealing temperature is 740~840 DEG C, and fast speed of cooling is 25~40 DEG C/s, overaging
Temperature is 170~400 DEG C.
The utility model has the advantages that
Compared with the prior art, the present invention has the following beneficial effects:
(1) 1000MPa grades of cold-bending property provided by the invention excellent cold-rolled biphase steel and its production technology, with C-Si-
Mn-Cr-Nb is basic alloy system, uses Cr, Nb combined microalloying to generate nanometer precipitation, and design low-carbon-equivalent alloy system
Welding performance is improved, the cold of low cost, low carbon content, high-hardenability, low yield strength ratio, high flexure type and its superhigh intensity is produced
Roll automobile steel.
(2) in the technical solution provided by the present invention, solid solution Nb exists in austenite with displaced atom, can press down strongly
The recrystallization of austenite processed, in low austenitic temperature section, Nb effectively can prevent austenite from tying again with the precipitation of C, N compound
Jingjing grain length is big, and can give austenite one wider non-recrystallization temperature section, to improve finish rolling start rolling temperature, drop
Low mill load reduces hot rolling plate thickness, mitigates cold rolling mill load under the premise of identical Cold Rolled Plate Thickness, in combination with not again
Crystallizing large deformation can be with fining ferrite grains.
Meanwhile the compound addition of Cr, Nb can significantly postpone the precipitation of Nb (C, N), refine Nb (C, N) particle size, lead to
Nanometer precipitating reinforcing effect is crossed, steel plate obdurability is improved.In addition, the stability of overcooling austenite can be improved in the addition of Cr, increase
Add steel grade harden ability, is conducive to martensite island size and intensity is kept in a certain range, and reduce C, Mn content, mitigate band-like group
It knits, improves cold-bending property and welding performance.In industrial production line, the overaging time is usually 300~500s, overaging temperature
Control is more difficult at 300 DEG C or less, and Cr can reduce steel grade for the sensibility of cooling rate and overaging temperature, and it is raw to improve industry
The stability of different batches of product performance during production.The thus strong cold-rolled biphase steel ratio C-Si- of C-Si-Mn-Cr-Nb system superelevation
Mn-Nb system steel is more suitable for industrialized production and obtains high-quality product.
(3) by controlling annealing temperature control in 740~840 DEG C, annealing soaking time in 60~200s, and continuous
, can be by the size Control on martensite island at 1~4 μm in annealing under the premise of 25~40 DEG C/s of fast speed of cooling, and adjust iron element
Body and martensite two-phase compatibility, to have different mechanical properties and cold-bending property feature.Steel grade tensile strength is 1006
~1210MPa, elongation is 12.1~18.2%, and yield tensile ratio is in 0.42~0.53, n value 0.23~0.32.It is especially minimum
Bending radius (90 ° of bendings) is 0.5~1.5mm, compares bending property (the Japanese NKK of domestic and international 1000MPa grades of cold-rolled biphase steel
And the minimum bending radius of iron company, SSAB Sweden is between 2~3mm), steel grade of the present invention has excellent bending clod wash
Energy.
Detailed description of the invention
Fig. 1 is the continuous annealing process system schematic diagram of the embodiment of the present invention；Fig. 2 is that the engineering of the embodiment of the present invention 7 is answered
Stress-strain curve；Fig. 3 is the tissue topography of 5 continuous annealing plate of the embodiment of the present invention；Fig. 4 is 5 chill plate Laser Welding of the embodiment of the present invention
Drawing by high temperature sample photo after connecing；Fig. 5 is 90 ° of clod wash sample photos of 4 annealed sheet of the embodiment of the present invention.
Specific embodiment
For following embodiment for illustrating the content of present invention, these embodiments are only the general description of the content of present invention,
The content of present invention is not limited.
Table 1 is the chemical component of embodiment steel；Table 2 is the specific hot rolling technology system of embodiment steel, wherein hot rolling plate thickness
Degree is 3.5mm；Table 3 is the cold rolling and continuous annealing process parameter of embodiment steel；Table 4 is the exemplary force of embodiment steel after annealing
Learn performance.
Chemical component (mass fraction) % of 1 invention steel of table
The hot-rolled process parameter of 2 invention steel of table
The continuous annealing process parameter of 3 invention steel of table
Typical mechanical property after the annealing of 4 invention steel of table
By the chemical component that the present invention designs, the steel of embodiment is through smelting continuous casting, according to the hot rolling technology controlled rolling control of setting
Cold and pickling and cold-rolling is annealed on air cooling continuous annealing line, finally obtains low yield strength ratio, the super high-strength cold rolling of high flexure type
Dual phase steel.Its tensile strength is 1006~1210MPa, and elongation is 12.1~18.2%, and yield tensile ratio is 0.42~0.53, n value
It is 0.23~0.32, minimum bending radius (90 ° of bendings) is 0.5~1.5mm.Manufactured steel plate can be used as the structural member of automobile
And reinforcer, such as frame member, door anti-collision joist, the bumper components of automobile.
Claims (2)
1. a kind of cold-rolled biphase steel that 1000MPa grades of cold-bending property is excellent, which is characterized in that chemical component presses quality percentage in steel
Than are as follows: C:0.03%~0.20%, Si:0.20%~0.80%, Mn:1.20%~2.20%, Cr:0.30%~0.60%,
Nb:0.020%~0.150%, Ni:0.050%~0.100%, P < 0.020%, S < 0.015%, N≤0.0050%, Al:
0.020%~0.150%, surplus is Fe and inevitable impurity.
2. a kind of manufacturing method for the cold-rolled biphase steel that 1000MPa as described in claim 1 grades of cold-bending properties are excellent, steel plate
Production technology are as follows: smelting, casting, slab heating, hot rolling, pickling, cold rolling, annealing, which is characterized in that
Slab heating temperature is 1180~1250 DEG C, and roughing start rolling temperature is 1150~1050 DEG C, and roughing finishing temperature is 1020
~980 DEG C, finish rolling start rolling temperature is 940~1000 DEG C, and finish rolling finishing temperature is 750~920 DEG C, and coiling temperature is 555~700
℃；
Hot rolled plate cold rolling after overpickling, is made flat cold-rolled sheet；Cold rolling reduction ratio is 45%~75%；
Flat cold-rolled sheet passes through annealing process, preparing finished articles steel plate；Wherein, annealing temperature is 740~840 DEG C, soaking time of annealing
For 60~200s, fast speed of cooling is 25~40 DEG C/s, and the overaging time is 120~500s, and overaging temperature is 170~400 DEG C.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110343953A (en) * | 2019-07-09 | 2019-10-18 | 武汉钢铁有限公司 | The 800MPa grade cold-rolled steel and production method of a kind of value >=0.155 hardenability value n |
| CN110735022A (en) * | 2019-11-20 | 2020-01-31 | 安徽工业大学 | High-strength plastic product ultra-high-strength automotive steel with both cold and hot forming flexibility applications |
| CN111215590A (en) * | 2020-04-16 | 2020-06-02 | 江苏沙钢集团有限公司 | Thin-gauge cold-rolled low-alloy high-strength steel and production method thereof based on double-roller casting rolling |
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