CN105274432B - 600 MPa-grade high-yield-ratio high-plasticity cold-rolled steel plate and manufacturing method thereof - Google Patents
600 MPa-grade high-yield-ratio high-plasticity cold-rolled steel plate and manufacturing method thereof Download PDFInfo
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- 239000010960 cold rolled steel Substances 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 title claims description 17
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 20
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 10
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 10
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 77
- 239000010959 steel Substances 0.000 claims description 77
- 238000000137 annealing Methods 0.000 claims description 30
- 238000005097 cold rolling Methods 0.000 claims description 23
- 238000001816 cooling Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 19
- 239000010955 niobium Substances 0.000 claims description 17
- 239000010936 titanium Substances 0.000 claims description 17
- 238000005096 rolling process Methods 0.000 claims description 15
- 238000002791 soaking Methods 0.000 claims description 14
- 229910000734 martensite Inorganic materials 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 229910001563 bainite Inorganic materials 0.000 claims description 9
- 238000005554 pickling Methods 0.000 claims description 8
- 238000010583 slow cooling Methods 0.000 claims description 8
- 229910001562 pearlite Inorganic materials 0.000 claims description 7
- 230000009467 reduction Effects 0.000 claims description 7
- 229910001275 Niobium-titanium Inorganic materials 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- RJSRQTFBFAJJIL-UHFFFAOYSA-N niobium titanium Chemical compound [Ti].[Nb] RJSRQTFBFAJJIL-UHFFFAOYSA-N 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 3
- 238000007670 refining Methods 0.000 claims description 3
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- 238000005098 hot rolling Methods 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
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- 238000001556 precipitation Methods 0.000 description 5
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- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
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- 241001417490 Sillaginidae Species 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 1
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- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a 600 MPa-grade high-yield-ratio high-plasticity cold-rolled steel plate which is characterized by comprising the following components in percentage by mass: 0.06% -0.12%, Si: 0.02 to 0.10%, Mn: 1.40% -2.00%, P: less than or equal to 0.015%, S: less than or equal to 0.010 percent, Al: 0.02% -0.10%, N: less than or equal to 0.0050%, Nb: 0.015-0.045%, Ti: 0.020-0.055%, and the balance of 0.035% to 0.100% of Nb + Ti, and the balance of ferrite is Fe and other inevitable impurities.
Description
Technical field
The invention belongs to automobile cold-rolled high intensity thin slab technique field, there is provided a kind of 600MPa levels high-yield-ratio is high-plastic
Property cold-rolled steel sheet and its manufacture method.
Background technology
Low energy consumption, loss of weight and high safety have become modern and future automobile development trend, be adapt to auto industry this
One development trend, automobile production producer and iron and steel enterprise and scientific research institutions be just actively working to body of a motor car " lightweight " design and
The research and development of automobile high-strength steel.Two-phase (DP) steel and phase change induction plasticity of the intensity developed at present from 590MPa to 980MPa
(TRIP) the automobile cold-rolled high strength steel such as steel industrial volume production, for the frame member of automobile, reinforcement and anti-collision energy absorption
On the automobile components such as part, body of a motor car " lightweight " requirement is realized.Due to the automobile structure with these high strength steel plate manufactures
Shaping is relatively easy, and less, work-hardening capacity is not high, although baking vanish process light plate after forming for the deflection of steel plate
Yield strength increases, and meets the strength and stiffness of vehicle body.But, these advanced cold rolling high strength steels are produced, to even
The cooling section and aging section Capability Requirement of continuous annealing furnace is higher, and annealing process control is harsh, and production difficulty is high.To reduce cold rolling height
Strength steel production difficulty, and the vehicle body of guarantee high-strength steel sheet manufacture has enough strength and stiffness, meets body of a motor car
" lightweight ", needs add micro alloying element in the composition of cold-rolled steel sheet, and production technology is improved, and make cold-rolled steel
Plate has high yield tensile ratio and excellent plasticity concurrently.
CN101376944A is related to a kind of high-strength high-tensile ratio cold-rolled steel sheet and its manufacture method, and the surrender of its steel plate is strong
Degree is more than 500MPa, and tensile strength is more than 600MPa, and yield tensile ratio is more than 0.80.It is more than 600MPa, Qu Qiang to obtain this intensity
Than the steel plate more than 0.80, in annealing process, steel plate is heated to be cooled fast to by two-part after 780-850 DEG C of insulation
Less than 200 DEG C, this technique first paragraph is easily controlled from high temperature rapid cooling, and second segment is quick under 400-500 DEG C of lower temperature
Less than 200 DEG C are cooled to, the annealed wire difficulty to cooling down by gas vapour is very big, does not possess actual operation.
CN101558178A provides a kind of cold-rolled steel sheet with high-yield-ratio and excellent weather resistance, adds in the steel grades
The alloying elements such as Nb, Ni, Co, Cr, Cu and B are entered, have been in 500 DEG C of temperature ranges to A1 transition points by the steel plate after cold rolling
Interior continuous annealing, obtains the yield tensile ratio of steel plate more than 0.85, and tensile strength is more than 800MPa, is mainly used in building, track traffic
Instrument and container, do not have comparativity with automobile high yield than the product and annealing process of cold rolling high strength steel plate.
A kind of production technology of the low-alloy high-strength cold-reduced sheet of automobile high strength and ductility that CN103088255A is announced, steel
Plate continuous annealing Jing after cold rolling, annealing soak temperature is 840-860 DEG C, and slow cooling temperature is 670-700 DEG C, and rapid cooling temperature is 410-
430 DEG C, completion of prescription temperature is 350-370 DEG C.Add to be combined in steel and with the addition of micro alloying element Ti and Nb, steel after annealing
The tensile strength of plate reaches 500MPa, and elongation reaches 30%, and strength and ductility product is 15GPa%, and yield tensile ratio reaches more than 0.80.
CN102492823A provides a kind of continuous annealing process of the cold rolling low-alloy high-strength steel plate of yield strength 420MPa level,
By the way that cold rolling two sections of the low-alloy high-strength steel plate Jing containing Ti, Nb chemical element is heated to into 800 ± 10 DEG C of insulations, then slow cooling
To 600 ± 20 DEG C of quick coolings, cooling end temp is 270 ± 20 DEG C, is finally such as water-cooled to room temperature, obtains yield strength about
For 430MPa, tensile strength is about 500MPa, and elongation after fracture is about 21% steel plate.This technique is by continuous annealing furnace rapid cooling
Section is identical with the adjustment of the cooldown rate of overaging section, reduces the cool time of steel plate.But, this annealing process is to continuous annealing
The cooldown rate of stove overaging section requires higher.
The content of the invention
Present invention aim at solving the problems referred to above that prior art is present, there is provided a kind of 600MPa levels high-yield-ratio is high-plastic
Property cold-rolled steel sheet and preparation method thereof, the smelting composition and hot rolling, cold rolling and continuous annealing process parameter of steel can be passed through, realize
The complex intensifying effect of the fetrite grain refinement of steel plate, precipitation strength and phase transformation strengthening, bends strong with the height for obtaining cold-rolled steel sheet
Than and high-ductility, meet cold rolling high strength steel plate manufacture vehicle body there are enough strength and stiffness, can industry continuously move back
Tensile strength is relatively easily produced on fiery production line in more than 600MPa, elongation after fracture is more than 19%, and yield tensile ratio is more than 0.8
High-yield-ratio high-ductility cold-rolled steel sheet.
For achieving the above object, the present invention takes technical scheme below：
A kind of 600MPa levels high-yield-ratio high-ductility cold-rolled steel sheet, it is characterised in that composition is by mass percentage C：
0.06%～0.12%, Si：0.02%～0.10%, Mn：1.40%～2.00%, P：≤ 0.015%, S：≤ 0.010%,
Al：0.02%～0.10%, N：≤ 0.0050%, Nb：0.015%～0.045%, Ti：0.020%～0.055% and full
Foot 0.035%≤Nb+Ti≤0.100%, balance of Fe and some other inevitable impurity.
A kind of 600MPa levels high-yield-ratio high-ductility cold-rolled steel sheet, it is characterised in that composition is by mass percentage C：
0.08%～0.10%, Si：0.05%～0.07%, Mn：1.60%～1.80%, P：≤ 0.010%, S：≤ 0.005%,
Al：0.05%～0.08%, N：≤ 0.0030%, Nb：0.025%～0.035%, Ti：0.035%～0.045%, and it is full
Foot 0.060%≤Nb+Ti≤0.080%, balance of Fe and some other inevitable impurity.
Steel grades control principle of the present invention is as follows：
C：It is intensified element basic in steel, the intensity and ductility of energy active balance steel.It is also to efficiently generate bainite
Be the high-yield-ratio for ensureing steel with the element of martensite low-temperature transformation phase, in the present invention C controls 0.06%～0.12%, more
It is preferred that 0.08%～0.10%.
Si：It is ferrite generating elements, promotes carbon to austenite segregation and suppress the formation of carbide, to solid in ferrite
Molten carbon has removing and catharsis, to avoid gap solution strengthening.The present invention relies primarily on the carbonitride of niobium titanium in ferrite
Precipitation strength in phase, and crystal grain refinement is improving ferrite intensity, has high yield strength to reach steel plate.Therefore, originally
Si is controlled 0.02%～0.10%, more preferably 0.05%～0.07%% in invention.
Mn：Belong to expansion austenite phase field, the element of stable austenite can effectively improve the quenching degree on austenite island,
Thus remaining austenite after steel plate middle temperature transformation can be reduced and be transformed into cooldown rate necessary to martensite, and play solid solution
Reinforcing and the effect of fining ferrite grains.High Mn content easily causes the banding group based on cementite, pearlite and bainite
Knit, and affect the welding performance of steel plate.Mn contents of the present invention control 1.40%～2.00%, more preferably 1.60%～
1.80%.
Al：Al is main deoxidier, while Al can also form AlN precipitations, plays certain Grain refinement.Steel
When middle Al is added for deoxidation, unsuitable too low, otherwise Mn, Si etc. thick oxide disperses in a large number in steel, deteriorates steel,
But excessive tufted aluminum oxide inclusion increases, the plasticity and weldability for making steel is deteriorated, and steel-making and continuous casting can be affected again, this
Al content is controlled 0.02%～0.10%, more preferably 0.05%～0.08% in invention.
Nb, Ti：It is the element of the yield strength and crystal grain thinning for effectively improving steel with precipitation strength effect.Add in steel
Enter Nb and Ti elements, form carbonitride, refining grain size simultaneously keeps the effect of carbon.Make ferrite matrix be strengthened, drop
The low difference of hardness with bainite and martensite phase, effectively improves the plasticity of steel plate.To make fining ferrite grains size and raising
Ferritic intensity, the content control of Nb of the present invention, Ti 0.015%～0.045% and 0.020%～0.055%, more preferably
0.025%～0.035% and 0.035%～0.045%, and meet 0.060%≤Nb+Ti≤0.080%.
N：In steel plate separate out nitride, contribute to strengthening steel plate, but it is superfluous, then and nitride is separated out in a large number, is caused and is prolonged
Rate and weldability deterioration are stretched, N content is controlled below 0.0050% in the present invention, more preferably less than 0.0030%.
P, S：For the harmful element in steel.P segregations easily on crystal boundary cause embrittlement, S MnS etc. easily to be formed in steel and is mingled with
Thing, the performance and weldability for making steel is deteriorated.P in the present invention, S content is controlled respectively 0.015% and less than 0.010%, more excellent
Select 0.010% and less than 0.005%.
A kind of 600MPa levels high-yield-ratio high-ductility cold-rolled steel sheet manufacture method, including converter smelting, pour after external refining
Casting, makes annealing treatment on hot continuous rolling, pickling and cold-rolling, continuous annealing furnace, smooth, it is characterised in that during hot continuous rolling, and heating of plate blank is arrived
1200～1300 DEG C, 120-180min is incubated, finish rolling start rolling temperature is 1000～1100 DEG C, and finishing temperature is 890～950 DEG C,
600～650 DEG C of coiling temperature, obtain microscopic structure be ferrite and pearlite hot-rolled coil, hot-rolled coil thickness be 2.0～
6.5mm；In described pickling and cold-rolling, cold rolling reduction ratio is 60～80%, and cold rolling coil plate thickness is 0.5～2.5mm；Described moves back
During fire is processed, steel band is 790～850 DEG C in the soaking zone temperature of annealing furnace, and soaking temperature retention time is 110～240s；Steel band is protected
Wen Hou, using quick cooling two-stage cooling after first Slow cooling, steel band is cooled to 700-730 by slow cooling section from holding temperature
DEG C, cooldown rate is 1～5 DEG C/s, and steel band is cooled to 320～360 DEG C by rapid cooling section with the cooldown rate of 25～50 DEG C/s, then
Wetted constructures are carried out at 320～360 DEG C, 440～920s of overaging time is air-cooled after timeliness, smooth to batch.
The reason for present invention selects technological parameter in above-mentioned each feature is as follows：
Between 1200～1300 DEG C, soaking time is 120-180min to slab soaking temperature.Soaking temperature control exists
More than 1200 DEG C, be the solid solution capacity for increasing Nb, improves precipitating reinforcing effect, but soaking temperature is not above 1300 DEG C, to avoid
Slab is overheated and burning.Soaking time is controlled between 120-180min, to make the tissue and composition full and uniformization of slab, and
Avoid the energy resource consumption of heat time long generation.
Finish rolling start rolling temperature is controlled between 1000～1100 DEG C, in order to several frames realize recrystallization zone before finish rolling
Rolling, the mill milling load before reducing under several frame heavy reductions.
Finishing temperature control is, for alloying element solid solution, to separate out to refine crystalline substance in annealing between 890～950 DEG C
Grain.Also, in Ar3 high temperature above finish to gauges, be conducive to structural homogenity, prevent deformation texture, anisotropy and banded structure
Generation.Finishing temperature no more than 950 DEG C, to prevent the excessive abnormal growth of recrystal grain, meanwhile, too high finishing temperature
The growing amount for causing oxide is increased dramatically, the plate surface quality after pickling (there is the oxide skin that deficient pickling is not eliminated) is cold rolling
It is deteriorated, reduces the plasticity of steel plate.
Oiler temperature control is batched between 600～650 DEG C under this temperature range, can prevent in subsequent eutectoid reaction compared with
Thick carbide is generated, it is also possible to mitigate the Carbonitride Precipitation thing of niobium titanium and the degree of growing up of ferrite crystal grain.
Cold rolling reduction ratio is controlled between 60～80% after pickling after hot-rolled coil, is to give full play to cold rolling mill energy
Power.Cold rolling reduction ratio is less than 60%, and cold rolling efficiency is low, and cold rolling reduction ratio is higher than 80%, and processing hardening is strengthened, cold roller and deformed drag
Increase, easily causing cold mill complex load transfinites.In addition, the pearlite colony spacing under this reduction ratio in structure of steel reduces and pearlite
It is broken more abundant, for the crystal grain refinement in annealing process condition is provided.
Because the carbonitride of niobium and titanium in steel suppresses ferritic recrystallization temperature, soaking temperature should be controlled during continuous annealing
Between 790～850 DEG C, soaking time is 110～240s to system.Pearlite in make steel be completely reformed into austenitizing and C,
The alloying elements such as Mn spread from ferrite in austenite, improve the stability of austenite.Soaking temperature is less than 790 DEG C, steel
Tissue austenitizing degree not enough, suitable bainite and martensite content can not be obtained during cooling.Soaking temperature is higher than 850
DEG C, Ovshinsky scale of construction is more but to dissolve in alloy amount therein relatively fewer, under the Critical cooling speed and bainite transformation of martensite transfor mation
Transformation Critical cooling speed is improved, and is difficult to obtain bainite and martensite under the limited cooldown rate of annealing furnace.
Steel band is cooled to into 700～730 DEG C from soaking temperature in continuous annealing line slow cooling section, cooldown rate is 1～5 DEG C/
S, be for adjust steel in austenite quantity and distribution, improve distributional pattern of the alloying element in austenite and ferrite.Hurry up
The cold section of cooldown rate with 25～50 DEG C/s, by steel plate 320～360 DEG C are cooled to, and are to avoid perlitic transformation, it is ensured that in it is low
The bainite and martensite transformation of temperature, 440～920s of overaging after steel plate rapid cooling makes martensite self tempering, coordinates and ferrite
Difference of hardness, improve steel plate plasticity.
Beneficial effect of the present invention：By the content of control C, Mn element during smelting, Si contents are reduced, and compound addition is certain
Nb the and Ti elements of amount, by controlled rolling and controlled cooling during hot rolling the excellent hot rolling base of rational hot rolling microstructure and surface and plate shape is obtained
Plate；In continuous annealing using the slow cooling after the soaking and rapid cooling section type of cooling twice, finally give yield strength and be more than
500MPa, in more than 600MPa, elongation after fracture is more than 19% to tensile strength, and yield tensile ratio is more than 0.8, and thickness is in 0.5～2.5mm
Between high-yield-ratio high-ductility cold-reduced sheet, the cold-reduced sheet of manufacture can be used as automobile reinforcement and structural member, meets Automobile
Requirement of the body to strength and stiffness.Can be used as the structural member of automobile, such as automobile longitudinal girder, door anti-collision joist, center pillar lower reinforcing plate with
And the reinforcement of bumper etc..
Description of the drawings
Fig. 1 is the microstructure picture of embodiment hot rolled plate；
Fig. 2 is the microscopic structure of the cold rolled annealed steel plate of embodiment；
Fig. 3 is the precipitate in the ferrite in embodiment hot rolled plate tissue；
Fig. 4 is the transmission electron microscope photo of the cold rolled annealed steel plate of embodiment.
Specific embodiment
Below by some embodiments, the present invention is further described.The composition of embodiment steel is shown in Table 1, hot-rolled process parameter
2 are shown in Table, continuous annealing process parameter is shown in Table 3, and the mechanical property of continuous annealing steel plate is shown in Table 4.Micro- group of the hot rolled plate of embodiment 1
Knit and see Fig. 1, the microscopic structure of cold rolled annealed plate is shown in Fig. 2, and the precipitate in hot rolling fire plate is shown in the transmission electricity of Fig. 3, cold rolled annealed plate
Mirror photo is shown in Fig. 4.
Chemical composition (mass fraction) % of the embodiment steel of table 1
| Embodiment | C | Si | Mn | P | S | Al | N | Nb | Ti | Nb+Ti |
| 1 | 0.06 | 0.02 | 1.90 | 0.010 | 0.007 | 0.10 | 0.0050 | 0.020 | 0.025 | 0.045 |
| 2 | 0.08 | 0.09 | 1.72 | 0.009 | 0.010 | 0.02 | 0.0030 | 0.025 | 0.035 | 0.060 |
| 3 | 0.09 | 0.05 | 1.80 | 0.007 | 0.006 | 0.05 | 0.0020 | 0.030 | 0.035 | 0.065 |
| 4 | 0.10 | 0.08 | 1.85 | 0.012 | 0.005 | 0.04 | 0.0050 | 0.045 | 0.055 | 0.100 |
| 5 | 0.11 | 0.04 | 1.63 | 0.008 | 0.009 | 0.08 | 0.0045 | 0.035 | 0.045 | 0.080 |
| 6 | 0.12 | 0.07 | 1.50 | 0.011 | 0.006 | 0.03 | 0.0036 | 0.040 | 0.050 | 0.090 |
| 7 | 0.07 | 0.10 | 2.00 | 0.014 | 0.004 | 0.06 | 0.0050 | 0.015 | 0.020 | 0.035 |
| 8 | 0.09 | 0.07 | 1.65 | 0.009 | 0.003 | 0.07 | 0.0028 | 0.025 | 0.045 | 0.070 |
| 9 | 0.08 | 0.06 | 1.70 | 0.008 | 0.005 | 0.06 | 0.0026 | 0.035 | 0.040 | 0.075 |
| 10 | 0.12 | 0.03 | 1.40 | 0.015 | 0.008 | 0.09 | 0.0040 | 0.030 | 0.025 | 0.055 |
The rolling technological parameter of the embodiment steel of table 2
The continuous annealing process parameter of the embodiment steel of table 3
The mechanical property of the embodiment steel annealed sheet of table 4
By the chemical composition of present invention design, the steel Jing of embodiment smelts continuous casting, and slab thickness is 230mm, according to setting
Fixed hot rolling technology controlled rolling and controlled cooling, obtains thickness for 2.0～6.5mm, the good hot rolled plate of plate shape and surface quality, hot rolled plate group
Knit and be made up of ferrite and pearlite, ferrite grain size is tiny, and have the carbon nitrogen of the niobium titanium of a large amount of small and dispersed distributions
Compound precipitate, plays reinforced ferrite effect, finally effectively increases the yield strength of annealed sheet steel.Hot rolled plate Jing pickling is cold
The substrate of 0.5～2.5mm is rolled into, is then annealed on continuous annealing line, the steel plate for finally giving is by ferrite and tempering
Martensite is constituted with a small amount of bainite, and its tensile strength is reached for more than 600MPa, yield tensile ratio Rp0.2/Rm>=0.80, intensity and prolong
Property the good cold-rolled steel sheet of matching.
Claims (2)
1. a kind of 600MPa levels high-yield-ratio high-ductility cold-rolled steel sheet manufacture method, it is characterised in that steel plate composition presses quality percentage
Than for C：0.06%～0.12%, Si：0.02%～0.10%, Mn：1.40%～2.00%, P：≤ 0.015%, S：≤
0.010%th, Al：0.02%～0.10%, N：≤ 0.0050%, Nb：0.015%～0.045%, Ti：0.020%～
0.055% and meet 0.035%≤Nb+Ti≤0.100%, balance of Fe and some other inevitable impurity；Including
Converter smelting, casts after external refining, makes annealing treatment on hot continuous rolling, pickling and cold-rolling, continuous annealing furnace, smooth, during hot continuous rolling, will
Heating of plate blank to 1200～1300 DEG C, is incubated 120-180min, and finish rolling start rolling temperature is 1000～1100 DEG C, and finishing temperature is
890～950 DEG C, 600～650 DEG C of coiling temperature obtains the carbonitride that microscopic structure is ferrite and pearlite and niobium titanium
Hot-rolled coil, hot-rolled coil thickness is 2.0～6.5mm；In described pickling and cold-rolling, cold rolling reduction ratio is 60～80%, cold rolling
Roll bending thickness is 0.5～2.5mm；In described annealing, steel band is 790～850 DEG C in the soaking zone temperature of annealing furnace,
Hot temperature retention time is 110～240s；After steel band insulation, using quick cooling two-stage cooling after first Slow cooling, slow cooling section will
Steel band is cooled to 700-730 DEG C from holding temperature, and cooldown rate is 1～5 DEG C/s, and rapid cooling section is with the cooldown rate of 25～50 DEG C/s
Steel band is cooled to into 320～360 DEG C, Wetted constructures are then carried out at 320～360 DEG C, 440～920s of overaging time,
Air-cooled after timeliness, smooth to batch, the tissue of final steel plate is made up of ferrite and tempered martensite with bainite.
2. a kind of 600MPa levels high-yield-ratio high-ductility cold-rolled steel sheet manufacture method according to claim 1, its feature exists
In composition by mass percentage be C：0.08%～0.10%, Si：0.05%～0.07%, Mn：1.60%～1.80%, P：≤
0.010%th, S：≤ 0.005%, Al：0.05%～0.08%, N：≤ 0.0030%, Nb：0.025%～0.035%, Ti：
0.035%～0.045%, and meet 0.060%≤Nb+Ti≤0.080%, balance of Fe is inevitable with some other
Impurity.
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