CN107619993A - Yield strength 750MPa level cold rolling martensite steel plates and its manufacture method - Google Patents
Yield strength 750MPa level cold rolling martensite steel plates and its manufacture method Download PDFInfo
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Abstract
The present invention relates to yield strength 750MPa level cold rolling martensite steel plates and its manufacture method, mainly solves the high technical problem of existing yield strength 750MPa levels cold rolling martensite steel plate manufacturing cost.Cold rolling martensite steel plate provided by the invention, its chemical component weight percentage are：C：0.12~0.22%, Si：0.30~0.90%, Mn：1.30~1.90%, Cr：0.20~0.80%, Ti：0.010~0.050%, Al：0.020~0.060%, P≤0.015%, S≤0.008%, N≤0.006%, Ca：0.0015~0.004%, surplus is iron and inevitable impurity.The yield strength of steel plate of the present invention is 790~830MPa, tensile strength >=980MPa, elongation after fracture A80>=6%.Mainly for the manufacture of lorry side bar and square tube column etc..
Description
Technical field
The present invention relates to cold rolling high-strength steel, more particularly to a kind of yield strength 750MPa level cold rolling martensite steel plates and its manufacturer
Method, belong to technical field of iron-base alloy.
Background technology
With the tremendous development of Global Auto industry, energy-saving and environmental protection, safety turn into the main trend researched and developed from now on, a series of
Experiment draw：The energy consumption of automobile is conducted oneself with dignity linear with it, and to general passenger car, such as weight reduction 10%, oil consumption can drop
Low 8%, discharge reduces by 4%, it is clear that lightweight is significant for the energy-conservation of automobile and reduction discharge.In addition, tend to people couple
The raising of driving safety requirement, forces automobile industry to use substantial amounts of high-strength plate, in order to avoid causing the larger person during collision
Injury, automobile steel requirement are provided simultaneously with the ductility that high intensity is become reconciled.Modern cold rolling high-strength steel mainly include DP steel, TRIP steel,
MP steel and MART steel etc..Producing high-strength steel can only be realized by two kinds of approach at present:One kind is by adding alloying element, separately
One kind is to improve quick cooldown rate, and armor plate strength is improved using phase transformation strengthening.The former can deteriorate the coating performance of strip, technique
It is required that complicated, and need the expensive production equipment of increase, increase the investment of producing line into and production cost.The latter requires that strip heats
To two-phase section or austenite one phase area, quickly cooled down after isothermal treatment for short time, the double of ferrite+martensite are formed by phase transformation strengthening
Xiang Gang, the Multiphase Steel of martensite+bainite or martensite single phase steel etc..Although can solution never add costliness alloying element just obtain
The problem of intensity steel grade must be expected, production technology cost is also reduced, but it is very high to the fast cooling technology proposition of continuous annealing
It is required that its quick cooling technique mainly has following several ways：Roller cold (Rolling Cooling), gas injection cooling (Gas Jet
Cooling), aerosol cooling (Accelerating Cooling), water quenching cooling (WaterQuench Cooling), nitrogen water combination cooling
(Wet Flashcooling), pentane are super dry and cold but (Pentane Ultra-Dry Cooling) etc..Cold rolling martensite steel typically uses
Continuous annealing unit production with water quenching function, equipment investment is larger, and craft precision requires high.For not possessing water quenching function
Continuous annealing unit, hot rolling, cold-rolling production process, be one so as to obtain high strength martensitic steel using suitable composition design
The significant work of item.
Chinese patent literature CN103305762A discloses a kind of automobile cold-rolled high strength dual phase steel of tensile strength 400MPa levels
Plate and preparation method thereof, it organizes to be mainly ferrite-martensite duplex structure, and martensite content is between 4~9%, its chemistry
Composition is：C：0.01~0.05%, Si：0.1~0.4%, Mn：1.2~1.6%, Cr：0.1~0.4%, Als：0.02~0.05%,
N≤0.005%, P≤0.02%, S≤0.01%, remaining is Fe and inevitable residual impurities element.Technology disclosed in the document
Method includes the processes such as hot rolling-pickling-cold rolling-heat treatment.Annealing heat treatment process step includes：First cold-reduced sheet is heated to
740~800 DEG C of annealing temperature, be incubated 90~120s, then with 5~8 DEG C/s speed slow cooling to 640~680 DEG C, then with more than
40 DEG C/s speed is quickly cooled to 260~320 DEG C of progress Wetted constructures, and the Wetted constructures time is 400~600s, last natural
It is cooled to room temperature.
Chinese patent literature CN104419877A discloses a kind of cold rolling martensite steel and its manufacture method with weatherability, its
Chemical composition is：C：0.10~0.20%, Si：0.20~0.80%, Mn：1.4~2.2%, Cr：0.3~0.8%, Ni：0.08~0.20%；
Cu：0.20~0.50%；V：0.08~0.15%；Ti：0.01~0.03%；B：0.0005~0.003%；Al：0.015~0.045%,
P≤0.020%, S≤0.007%, N≤0.008%, surplus are iron and inevitable impurity.Technology disclosed in the document is whole
910~950 DEG C of temperature is rolled, coiling temperature is 660~700 DEG C, and annealing temperature is 780~840 DEG C, and slow cooling outlet temperature is 680 DEG C,
Fast speed of cooling is 35~60 DEG C/s, and rapid cooling end temp is 240~300 DEG C, and annealing soaking time is 110~170s；Overaging temperature
For 380~430 DEG C, the overaging time is 200~400s, and smooth elongation percentage is not higher than 0.6%.The steel plate of embodiment production is applicable
There is the cold rolling martensite steel of weatherability in producing 1.0~1.4mm, yield strength reaches more than 1000MPa levels, and tensile strength exists
More than 1100MPa, elongation percentage A50mm% is more than 5%.
Chinese patent literature CN103981440A discloses a kind of 700MPa levels type of resistance to industrial atmospheric martensite steel plate and its system
Preparation Method, its chemical composition are：C0.17~0.25%；Si0.10~0.40%；Mn0.50~0.80%；P≤0.020%；S≤0.001%；
Al0.015~0.040%；Nb0.02~0.05%；Ti0.010~0.030%；Remaining is Fe and inevitable impurity.The document
The preparation method of disclosed technology steel plate, comprises the following steps：(1) weak degassing of VD vacuum；(2) secondary VD vacuum
Strong degassing；(3) heating of plate blank；(4) roughing；(5) finish rolling；(6) intercritical hardening；(7) high temperings；(8) two
Secondary lonneal.750~800 DEG C of the technology intercritical hardening temperature, 30~50 DEG C/s of cooling velocity, obtain a small amount of free carbide+
Martensite+retained austenite, 600~650 DEG C, 120~150min of soaking time of a high tempering temperature, aggregation eliminate carbonization
Thing, martensite lath, toughness plasticity is improved, 200~250 DEG C, 80~120min of soaking time of secondary high-temperature temperature, is reduced
Fragility, internal stress is eliminated, obtains mixed type tempered martensite.
Cold-rolled biphase steel or martensite steel plate disclosed in above-mentioned patent document, although what is had devises corresponding chemical composition, adds
Certain alloy, but addition and continuous annealing process difference due to alloy, the dual phase steel yield strength and tension of production are added
Intensity is relatively low, does not reach the intensity requirement of high-strength steel.Although what is had has reached the intensity requirement of high strength martensitic steel, surrender is strong
Degree >=1000MPa, but need to add the alloying elements such as Ni, V, B raising intensity, production cost is high, and the addition of B element
Continuous casting steel billet is produced defect, reduce the welding performance of steel plate, simultaneously because finishing temperature is higher, easily generated in belt steel surface
Iron scale influences surface quality.The Nb elements (0.02~0.05%) that not only add costly also improve intensity, and
And need just obtain yield strength 700MPa level tempered martensite steel using double tempering on annealing process, complex manufacturing,
Production cost also can accordingly increase.
The content of the invention
It is an object of the invention to provide a kind of yield strength 750MPa level cold rolling martensite steel plates and its manufacture method, main solution
The high technical problem of certainly existing yield strength 750MPa levels cold rolling martensite steel plate manufacturing cost, is not possessing quenching cooling capacity
Continuous annealing unit produce yield strength 750MPa level cold rolling martensite steel plates.
The technical solution adopted by the present invention is：A kind of yield strength 750MPa levels cold rolling martensite steel plate, its chemical component weight
Percentage is：C：0.12~0.22%, Si：0.30~0.90%, Mn：1.30~1.90%, Cr：0.20~0.80%, Ti：0.010~0.050%,
Al：0.020~0.060%, P≤0.015%, S≤0.008%, N≤0.006%, Ca：0.0015~0.0040%, surplus is iron
And inevitable impurity.
The reasons why chemical composition of yield strength 750MPa levels cold rolling martensite steel plate of the present invention limits within the above range
It is as follows：
C：C is solution strengthening element, is the important indicator of the intensity and weldability that influence steel.When C content is low, without foot in steel
Enough carbide and solid solution carbon, enough distortion can not be produced when austenite is transformed into martensite with strengthen martensite so as to obtain compared with
High intensity；When C content is too high, plasticity and toughness decline, and welding performance is significantly reduced.Therefore, C content control in steel of the present invention
System is 0.12~0.22%.
Si：Si is also solution strengthening element, can expand critical zone scope, purifies ferrite, improves quenching degree etc., but Si contains
Measure and too high be unfavorable for weldability and strip surface quality.Consider, the control of Si contents is 0.30~0.90% in steel of the present invention.
Mn：Mn can improve the intensity of steel plate after quenching.Mn is the element of stable austenite, can reduce the phase alternating temperature of austenite
Degree, promote dissolvings of the C in austenite, increase C enrichment, postpone the formation of pearlite, geneva is formed so as to expand quenching
The application of the cooldown rate of body tissue.But too high Mn can reduce C activity, it is also easy to be segregated, deteriorates the performance of steel.
Therefore, Mn contents are controlled 1.30~1.90% in steel of the present invention.
Cr：Cr can significantly improve the inoxidizability of steel, significantly improve the quenching degree of steel, improve temper resistance etc..Cr contents surpass
Crevice corrosion can be caused when 0.80%, can also increase production cost, at the same it is unfavorable to delayed fracture.Consider, this hair
The control of Cr contents is 0.20~0.80% in bright steel.
Ti：Ti is a kind of strong carbonitride-forming elements, and the N that appropriate Ti can be fixed in steel simultaneously forms tiny TiN particles,
The too low effect for not having crystal grain thinning of Ti contents, suitable Ti can notable crystal grain thinning, improve welding performance.In the present invention
Ti contents are controlled 0.010~0.050%.
Al：Al is the main deoxidant element in steel, is advantageous to crystal grain thinning, but excessive Al increases the quantity of steel inclusion
Add and deteriorate its processability.The Al added in the present invention is mainly used to deoxidation and crystal grain thinning, therefore the control of its content exists
0.020~0.060%.
N：N in steel forms TiN with Ti chemical combination, and matrix can be strengthened by separating out the second phase in high temperature, but N content is too high can be
Thick TiN, or solid solution N are formed in steel, damages plasticity and toughness.N≤0.006% is controlled in steel of the present invention
P and S：P is the harmful element of steel grade, the serious plasticity and toughness for damaging steel plate；S is formed in steel with chemical combination such as Mn
Plastic occluded foreignsubstance MnS, it is unfavorable to the horizontal plastic property and toughness of steel, therefore S content should be low as much as possible.Controlled in the present invention
P≤0.015%, S≤0.008%.
Ca：The result of Ca processing is that generation is tiny using CaO-Al2O3 as core, wraps up in (Ca, Mn) S spherical compound folder outside
Debris, substitute the MnS of strip to be mingled with, reduce the amount of inclusions and size, improve buckling performance.Therefore, in the present invention
Ca contents are controlled 0.0015~0.004%.
A kind of manufacture method of yield strength 750MPa levels cold rolling martensite steel plate, this method include：
Molten steel obtains continuous casting steel billet through continuous casting, wherein the percentage by weight of the ladle chemistry is：C：0.12~0.22%, Si：
0.30~0.90%, Mn：1.30~1.90%, Cr：0.20~0.80%, Ti：0.010~0.050%, Al：0.020~0.060%, P
≤ 0.015%, S≤0.008%, N≤0.006%, Ca：0.0015~0.0040%, surplus is iron and inevitable impurity；
Continuous casting steel billet carries out hot rolling after being heated to 1220~1260 DEG C, described hot rolling is two-part rolling mill practice, in austenite again
More than crystallization temperature roll, 1040~1100 DEG C of roughing end temp；In the non-recrystallization temperature area rolling of austenite, finish rolling terminates
Temperature is 840~900 DEG C, and steel plate thickness is 2.0~4.0mm after finish rolling, and section cooling is cooled down using leading portion after finish rolling, coiling temperature
For 530~610 DEG C when batch to obtain coils of hot-rolled steel.
Coils of hot-rolled steel again after uncoiling through pickling, cold rolling, vertical continuous annealing furnace annealing, it is smooth, batch to obtain thickness for 1.0~
2.0mm finished steel plates, the cold rolling reduction ratio are 50~68%, roll hard state strip in vertical continuous annealing after cold rolling
The soaking zone temperature of furnace annealing is 840~880 DEG C, and strip is 160~180s in the annealing time of soaking zone, and strip rapid cooling starts temperature
Spend for 680~730 DEG C, rapid cooling final temperature is 200~260 DEG C, and fast speed of cooling is 30~50 DEG C/s, and heat up overaging section after rapid cooling
Equilibrium temperature is 280~330 DEG C, and the overaging time is 600~680s, and smooth elongation percentage is 0.1~0.2%.
The reasons why production technology that the present invention takes, is as follows：
1st, continuous casting steel billet heating-up temperature is set
In view of the requirement that continuous casting steel billet austenite structure homogenization and steel alloy finish rolling roll-force are stable, slab is needed higher
Temperature range heats.Higher tapping temperature can be partly dissolved the second phase particles such as more thick (Ti, Mn) S, rear
Disperse, tiny precipitate are generated in continuous cooling procedure, improves product strength, but when heating-up temperature is too high, can be in strip table
Face forms scale defect, influences surface quality.Therefore, continuous casting steel billet heating-up temperature of the present invention is 1220~1260 DEG C.
2nd, roughing end temp is set
Rolling process of rough rolling rolls more than austenite recrystallization temperature, can make the Austenite Grain Refinement in strand.Roughing terminates
Temperature is too high, and grain refining effect is bad, and end temp is too low, can increase finish rolling rolling difficulty, influence of rolled stability.Cause
This, the present invention sets roughing end temp as 1040~1100 DEG C.
3rd, finish rolling end temp is set
Finish rolling end temp needs to control in Ar3More than transformation temperature to ensure to roll in austenitic area, but control high finishing temperature
Scale defect is also easy to produce, influences the surface quality of cold-rolled products.Therefore, finish rolling end temp of the present invention is set as 840~90
0℃。
4th, section cooling mode is set
Finish rolling, which terminates rear slower cooling, to be slowed by ferritic phase, and ferrite crystal grain is thick, and yield strength is relatively low, faster layer
The appropriate fining ferrite grains of stream cooling meeting, and obtain other reinforcing tissues.The follow-up cold rolling of hot-strip of the present invention, annealing
Process needs the certain hot rolling intensity of heredity, therefore sets section cooling mode and cooled down as leading portion.
5th, hot-rolling coiling temperature is set
Appropriate coiling temperature can make hot-strip obtain certain intensity, at the same the precipitation of second phase particles can meet it is follow-up cold
Roll the requirement of annealing.Coiling temperature is higher, and cold rolled annealed rear recrystal grain is easily grown up, and intensity decreases, coiling temperature is relatively low,
Hot-strip intensity is higher, can exceed cold rolling mill upper load limit and causing roll it is unstable.Therefore, present invention setting laminar flow volume
It is 530 DEG C~610 DEG C to take temperature.
6th, cold rolling reduction ratio is set
Cold rolling of the present invention is rolled using 5 frame tandem mill groups, the increase of cold rolling reduction, can promote the recrystallization of continuous annealing,
The tiny tissue of crystal grain is obtained, so as to improve the intensity of steel plate, but deflection improves to a certain extent, and mill load steeply rises,
Increase production difficulty and rolling stability.Therefore, the present invention sets cold rolling reduction ratio as 50~68%.
7th, annealing temperature and annealing time setting
Annealing heating mainly makes the steel plate after cold rolling realize austenitizing, is prepared for follow-up quenching technical, Austria of cold-reduced sheet
Family name's body temperature needs to control in Ar3More than, to ensure that interior tissue is all transformed into austenite as far as possible.High heating-up temperature one
Aspect can exceed the annealing furnace heating efficiency upper limit, on the other hand austenite crystal can be made fully to grow up, and be unfavorable for intensity after quenching
Improve.Therefore, the present invention sets annealing temperature of the steel band in vertical continuous annealing furnace soaking zone as 840~880 DEG C, in soaking zone
Time is set as 160~180s.
8th, rapid cooling and overaging segment process parameter setting
The main amount for influenceing overcooling austenite of rapid cooling start temperature height, so as to influence the content of martensite in high-strength steel.Cooling speed
When degree reaches 30 DEG C/more than s, with the rising of rapid cooling start temperature, the amount of overcooling austenite accordingly increases, the martensite ultimately formed
Amount can also increase, this is the main reason for meeting intensity.
Rapid cooling final temperature is lower, it is not only possible to ensures that overcooling austenite is fully transformed into martensite, and can avoid martensite
During overaging it is too high due to temperature caused by martensite excessive decomposition, cause intensity decreases.
Whether fast speed of cooling is transformed into that bainite and martensite is most important, and when cooling velocity is low, supercooling is difficult to understand to overcooling austenite
Family name knows from experience preferential conversion into ferrite, carbon enrichment occurs in overcooling austenite, it is also possible to carbide precipitate, the amount of final martensite
It is less.When speed of cooling is higher soon, more overcooling austenite can be transformed into martensite in cooling procedure, strong so as to be advantageous to improve
Degree.
Martensite steel after rapid cooling is not being reduced or not had to intensity, it is necessary to by Wetted constructures improvement interior tissue uniformity
In the case of significantly affecting, improve the plasticity and toughness of martensite steel.Low-temperature space carry out overaging when, sample tissue substantially without
Change, martensite is distributed on ferrite matrix in lath-shaped in tissue.And overaging temperature it is higher when, martensite can occur point
Solution, and its degree of decomposition is bigger with the rise of overaging temperature, volume fraction reduces, and causes intensity to decline notable, it is impossible to full
The high-strength performance requirement of foot.
Therefore, the technological parameter of rapid cooling of the present invention and overaging section is：Strip is 680~730 DEG C in rapid cooling start temperature, and rapid cooling is whole
Only temperature is 200~260 DEG C, and fast speed of cooling is 30~50 DEG C/s, and the overaging section equilibrium temperature that heated up after rapid cooling is 280~330 DEG C, mistake
Aging time is 600~680s, to ensure the uniformity of martensite steel plate interior tissue after Wetted constructures.
9th, smooth elongation percentage setting
Smooth main purpose is to eliminate material yield platform, is weighed with the index of elongation percentage, elongation percentage is too low, it is impossible to eliminates
Yield point elongation, it is local during punching press easily to produce wrinkle defect.Elongation percentage is too high, and crystal grain is significantly elongated, the horizontal stroke of material, longitudinal direction
The poor performance opposite sex is big, and poor processability, punching press is easily ftractureed.The smooth elongation percentage of the present invention is 0.1~0.2%.
The microscopic structure for the yield strength 750MPa level cold rolling martensite steel plates that the present invention obtains is martensite+a small amount of ferrite,
Grain size number is I11~I13 levels, yield strength Rp0.2For 790~830MPa, tensile strength Rm>=980MPa, has no progeny and prolongs
Stretch rate A80>=6%, 180 ° of bend tests, d=0a is qualified.
Yield strength 750MPa level cold rollings martensite steel plate of the present invention is used to make truck (lorry) side bar and square tube column etc.,
Alternative 2.5~3.0mm think gauges high strength steel plate, light weight effect is notable, has the higher market competitiveness.
The present invention has following good effect compared with prior art：1st, present invention improves over the Design of Chemical Composition of steel, C,
On the basis of Mn steel, appropriate Cr, Ti alloying element is added, is not significantly improved in cost of alloy, does not possess quenching intensity
Continuous annealing production line produces qualified high-strength cold rolling martensite steel, product can manufacture using strong air-cooler+Wetted constructures equipment etc.
Property is good, and manufacturing cost is low.2nd, cold rolling martensite steel 1.0~2.0mm of thickness of the inventive method production, yield strength >=750MPa,
Tensile strength >=980MPa, elongation after fracture A80>=6%, 180 ° of bend tests, d=0a is qualified, and alternative 2.5~3.0mm is thick
Size high-tensile steel plate, light weight effect is notable, has the higher market competitiveness.3rd, present invention steel-making, which uses, adds Ca processing,
It is mingled with MnS and is changed into spherical, improvement cracking during bending defect by strip；Heating overaging section equilibrium temperature is after rapid cooling
280~330 DEG C, and ensure the enough overaging time, the uniformity of strong cold rear martensite steel plate interior tissue is improved, ensure that
Preferable buckling performance, it is better than general high-strength cold rolling martensite steel.
Brief description of the drawings
Fig. 1 is the metallographic structure photo of cold rolling martensite steel plate embodiment 2 of the present invention.
Embodiment
Below by embodiment 1~4, the invention will be further described.
Table 1 is the chemical composition (by weight percentage) of steel of the embodiment of the present invention, and surplus is iron and inevitable impurity.
The chemical composition of the martensite steel of the embodiment of the present invention of table 1, unit：Percentage by weight/%.
The requirement designed according to material composition of the present invention, using the qualified molten steel of converter top bottom blowing composition, through sheet billet continuous casting
Continuous casting steel billet is obtained, continuous casting steel billet thickness is 210~230mm, and width is 900~1600mm, and length is 8500~11000mm.
The scale slab of STEELMAKING PRODUCTION delivers to heating furnace reheating, and hot tandem rolling is delivered to after de-scaling of coming out of the stove.By roughing and
Finish rolling Continuous mill train controlled rolling, is batched after section cooling, and laminar flow is cooled down using leading portion, the qualified coils of hot-rolled steel of output,
The thickness of hot rolled steel plate is 2.0~4.0mm.Hot rolling main technique control parameter is shown in Table 2.
The hot rolling technology control parameter of the embodiment of the present invention of table 2
It is cold in 6 roller UCM (omnipotent convexity band intermediate calender rolls play) 5 frames by above-mentioned coils of hot-rolled steel again uncoiling after overpickling
Tandem mill carries out once cold rolling, and the reduction ratio of cold rolling is 50%~68%, and the steel band of hard state is rolled after cold rolling by vertical continuous
Anneal, Wetted constructures, it is smooth, batch to obtain 1.0~2.0mm of thickness finished steel plate.Annealing process is：Strip
It it is 840~880 DEG C in the soaking zone temperature of vertical continuous annealing furnace annealing, strip is 160~180s in the annealing time of soaking zone；
Strip rapid cooling start temperature is 680~730 DEG C, and rapid cooling final temperature is 200~260 DEG C, and fast speed of cooling is 30~50 DEG C/s, rapid cooling
The overaging section equilibrium temperature that heats up afterwards is 280~330 DEG C, and the overaging time is 600~680s, and smooth elongation percentage is 0.1~0.2%.
Cold rolling, annealing, flattening technological parameter are shown in Table 3.
The cold rolling of the embodiment of the present invention of table 3, annealing, flattening process control parameter
The yield strength 750MPa level cold rolling martensite steel plates obtained using the above method.Reference picture 1, its be organized as martensite+
A small amount of ferrite, grain size number are I11~I13 levels, yield strength Rp0.2>=750MPa, tensile strength Rm>=980MPa,
Elongation after fracture A80>=6%, 180 ° of bend tests, d=0a is qualified.
By the obtained cold rolling martensite steel plate of the present invention according to《GB/T228.1-2010 metal material stretching test part 1s：
Room temperature test method》Tension test is carried out, its mechanical property is shown in Table 4.
The mechanical property of the martensite steel of the embodiment of the present invention of table 4
In addition to the implementation, the present invention can also have other embodiment.All skills formed using equivalent substitution or equivalent transformation
Art scheme, all fall within the protection domain of application claims.
Claims (4)
1. a kind of yield strength 750MPa levels cold rolling martensite steel plate, its chemical component weight percentage are：C：0.12~0.22%,
Si：0.30~0.90%, Mn：1.30~1.90%, Cr：0.20~0.80%, Ti：0.010~0.050%, Al：0.020~0.060%,
P≤0.015%, S≤0.008%, N≤0.006%, Ca：0.0015~0.004%, surplus is iron and inevitable impurity, institute
The microscopic structure for stating cold rolling martensite steel plate is martensite+a small amount of ferrite, and the tissue grain size number is I11~I13 levels.
2. yield strength 750MPa levels cold rolling martensite steel plate as claimed in claim 1, its 1.0~2.0mm thickness cold rolling martensite steel
The yield strength R of platep0.2>=750MPa, tensile strength Rm>=980MPa, elongation after fracture A80>=6%.
3. a kind of manufacture method of yield strength 750MPa levels cold rolling martensite steel plate, including：
Molten steel obtains continuous casting steel billet through continuous casting, wherein the percentage by weight of the ladle chemistry is：C：0.12~0.22%,
Si：0.30~0.90%, Mn：1.30~1.90%, Cr：0.20~0.80%, Ti：0.010~0.050%, Al：0.020~0.060%,
P≤0.015%, S≤0.008%, N≤0.006%, Ca：0.0015~0.004%, surplus is iron and inevitable impurity；
Continuous casting steel billet carries out hot rolling after being heated to 1220~1260 DEG C, described hot rolling is two-part rolling mill practice, in austenite again
More than crystallization temperature roll, 1040~1100 DEG C of roughing end temp；In the non-recrystallization temperature area rolling of austenite, finish rolling terminates
Temperature is 840~900 DEG C, and section cooling is cooled down using leading portion after finish rolling, and coiling temperature batches to obtain hot-rolled steel when being 530~610 DEG C
Volume；
Coils of hot-rolled steel again after uncoiling through pickling, cold rolling, vertical continuous annealing furnace annealing, it is smooth, batch to obtain thickness for 1.0~
2.0mm finished steel plates, the cold rolling reduction ratio are 50~68%, roll hard state strip in vertical continuous annealing after cold rolling
The soaking zone temperature of furnace annealing is 840~880 DEG C, and strip is 160~180s in the annealing time of soaking zone, and strip rapid cooling starts temperature
Spend for 680~730 DEG C, rapid cooling final temperature is 200~260 DEG C, and fast speed of cooling is 30~50 DEG C/s, and it is out-of-date to be heated up after strip rapid cooling
It is 280~330 DEG C to imitate section equilibrium temperature, and the overaging time is 600~680s, and smooth elongation percentage is 0.1~0.2%.
4. the manufacture method of yield strength 750MPa levels cold rolling martensite steel plate as claimed in claim 3, it is characterised in that hot rolling
After finish rolling, it is 2.0~4.0mm to control hot rolled steel plate thickness.
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109439873A (en) * | 2018-11-28 | 2019-03-08 | 北京首钢冷轧薄板有限公司 | A kind of process control method of 1000MPa grades of martensite automobile steel |
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| EP3702477A4 (en) * | 2017-10-26 | 2021-03-31 | University Of Science And Technology Beijing | Method for producing ultra high strength martensitic cold-rolled steel sheet by means of ultra fast heating process |
| CN109439873A (en) * | 2018-11-28 | 2019-03-08 | 北京首钢冷轧薄板有限公司 | A kind of process control method of 1000MPa grades of martensite automobile steel |
| CN109778062A (en) * | 2018-12-28 | 2019-05-21 | 首钢集团有限公司 | A kind of tensile strength 1200MPa grades of cold rolling Multiphase Steels and preparation method thereof |
| CN109778062B (en) * | 2018-12-28 | 2020-09-15 | 首钢集团有限公司 | Cold-rolled complex phase steel with tensile strength of 1200MPa and preparation method thereof |
| CN109913763A (en) * | 2019-03-25 | 2019-06-21 | 武汉钢铁有限公司 | The good inexpensive cold-rolled biphase steel of 1000MPa grades of cold-forming properties and its manufacturing method |
| CN109913763B (en) * | 2019-03-25 | 2020-07-03 | 武汉钢铁有限公司 | Low-cost cold-rolled dual-phase steel with good 1000 MPa-level cold processing performance and manufacturing method thereof |
| CN113748219B (en) * | 2019-05-15 | 2023-06-20 | 安赛乐米塔尔公司 | Cold rolled martensitic steel and method for martensitic steel thereof |
| CN113748219A (en) * | 2019-05-15 | 2021-12-03 | 安赛乐米塔尔公司 | Cold-rolled martensitic steel and method for martensitic steel |
| CN110079735A (en) * | 2019-05-17 | 2019-08-02 | 武汉钢铁有限公司 | 460MPa grades of yield strength of cold rolling Hi-Stren steel and production method |
| CN110964893B (en) * | 2019-11-18 | 2021-08-03 | 江苏延汉材料科技有限公司 | Controlled rolling annealing method for stainless steel for cutter |
| CN110964893A (en) * | 2019-11-18 | 2020-04-07 | 江苏延汉材料科技有限公司 | Controlled rolling annealing method for stainless steel for cutter |
| CN111979489B (en) * | 2020-09-07 | 2021-11-16 | 鞍钢股份有限公司 | 780 MPa-grade high-plasticity cold-rolled DH steel and preparation method thereof |
| CN111979489A (en) * | 2020-09-07 | 2020-11-24 | 鞍钢股份有限公司 | 780 MPa-grade high-plasticity cold-rolled DH steel and preparation method thereof |
| CN112226679A (en) * | 2020-09-14 | 2021-01-15 | 包头钢铁（集团）有限责任公司 | Cold-rolled 980 MPa-grade martensitic steel and production method thereof |
| CN114196874A (en) * | 2020-09-18 | 2022-03-18 | 宝山钢铁股份有限公司 | 1000MPa cold-rolled super-strong steel tensile sample and manufacturing method thereof |
| CN112322975A (en) * | 2020-10-27 | 2021-02-05 | 北京首钢股份有限公司 | Steel for ultrahigh-strength cold-rolled carriage plate and manufacturing method thereof |
| CN112410685A (en) * | 2020-11-12 | 2021-02-26 | 包头钢铁（集团）有限责任公司 | Cold-rolled 980 MPa-grade quenching distribution steel and production method thereof |
| CN114763595A (en) * | 2021-01-15 | 2022-07-19 | 宝山钢铁股份有限公司 | Cold-rolled steel sheet and method for manufacturing cold-rolled steel sheet |
| CN115181890B (en) * | 2021-04-02 | 2023-09-12 | 宝山钢铁股份有限公司 | 1180 MPa-level low-carbon low-alloy dual-phase steel and rapid heat treatment manufacturing method |
| CN115181890A (en) * | 2021-04-02 | 2022-10-14 | 宝山钢铁股份有限公司 | 1180 MPa-grade low-carbon low-alloy dual-phase steel and rapid heat treatment manufacturing method |
| CN113308648A (en) * | 2021-05-14 | 2021-08-27 | 唐山钢铁集团高强汽车板有限公司 | Cold-rolled martensite steel substrate and production method thereof |
| CN113308648B (en) * | 2021-05-14 | 2022-11-15 | 唐山钢铁集团高强汽车板有限公司 | Cold-rolled martensite steel substrate and production method thereof |
| CN113528932A (en) * | 2021-05-31 | 2021-10-22 | 唐山钢铁集团高强汽车板有限公司 | Martensite steel plate and preparation method thereof |
| CN115679193A (en) * | 2021-07-29 | 2023-02-03 | 宝山钢铁股份有限公司 | Steel for cold-rolled flexible pipe with yield strength of more than 750MPa and manufacturing method thereof |
| CN115044831B (en) * | 2022-06-09 | 2023-08-25 | 包头钢铁（集团）有限责任公司 | 1100MPa grade cold-rolled martensitic steel and manufacturing method thereof |
| CN115044831A (en) * | 2022-06-09 | 2022-09-13 | 包头钢铁（集团）有限责任公司 | 1100 MPa-grade cold-rolled martensitic steel and manufacturing method thereof |
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