CN105018843B - Vanadium and titanium are combined the Q＆P steel of interpolation and its manufacture method - Google Patents
Vanadium and titanium are combined the Q＆P steel of interpolation and its manufacture method Download PDFInfo
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Abstract
The invention discloses a kind of vanadium and titanium are combined the Q＆P steel of interpolation and its manufacture method, belong to third generation automobile steel research field.What vanadium and titanium were combined interpolation with energy-conservation, the component of efficient Q＆P steel and weight percent content is：C 0.17 ~ 0.22%, Si 1.3 ~ 1.6%, Mn 1.5 ~ 2.2%, P≤0.010%, S≤0.008%, V 0.03 ~ 0.070%, Ti 0.02 ~ 0.04%, balance of Fe and inevitable impurity.Ti in steel plays a part of crystal grain thinning, and V plays a part of precipitation strength.Energy-conservation prepared by the present invention, be organized as polygonal ferrite, martensite and the retained austenite of efficient Q＆P steel are organized, and yield strength is 550 ~ 650 MPa, and tensile strength is 1350 ~ 1450 MPa, elongation after fracture >=15.0%, strength and ductility product >=22.0 GPa %.
Description
Technical field
The invention belongs to the Q＆P steel PRODUCTION TRAITS field of third generation automobile steel, more particularly to a kind of have energy-conservation, height
The vanadium of effect, titanium are combined the Q＆P steel of interpolation and its manufacture method.
Background technology
Since the eighties in 19th century first generation automobile come out, especially since 20th century six the seventies, North America, Japan
Developed rapidly with the auto industry in West Europe.Automobile is one of mainstay industry of Chinese national economy, national to pulling
Economic and guarantee employment etc. has a very important role.In recent years, China's automobile volume of production and marketing increases year by year, 2013, China
Auto output 2211.68 ten thousand, sales volume 2198.41 ten thousand；2014, China's automobile volume of production and marketing broke through 23,000,000 in pairs；
2015, automobile volume of production and marketing is estimated to be may proceed to increase, and reaches 25,000,000.In the past ten years, the auto output of China from
2000000 rise to breakthrough 23,000,000, the speedup for keeping 25% or so in continuous 7 years, if country 10 years from now on is automobile market
Year speedup control, will be more than 300,000,000 to the year two thousand twenty China automobile pollution 8.5%；If year speedup as little as 5.5%, it is contemplated that
, ten thousand about more than 3000, recoverable amount will be more than 2.6 hundred million for the year two thousand twenty sales volume.In view of above-mentioned development trend, quick of automobile industry
Exhibition will necessarily drive automobile steel new theory, the appearance of new technology, development and application.
New automobile steel not only can reach the lightweight of automobile by high strengthening, and need higher plasticity
Improve the crystallized ability of steel and the collision safety performance of automobile.In order to describe this High-strength high-plasticity steel intuitively and exactly,
American scholar Krupitzer and Heimbuch take the lead in proposing with high strength and ductility performance (i.e. the taking advantage of of tensile strength Rm and plasticity A
Product) the 3rd generation automobile steel concept, as the R＆D direction of following new automobile steel.As automobile steel has a large capacity and a wide range
And with high content of technology, the development level of High-quality automobile steel is also the important of the whole steel research of country and the level of production
Mark.Q＆P steel is the representative of third generation automobile steel, by Q＆P technique, it is possible to achieve the combination of high intensity and plasticity.Q&P
Steel is because of the combination of excellent obdurability, and need not add alloying element and have broad application prospects.At present to Q＆P steel
Research more be two-step method Technology for Heating Processing, one-step technology is studied less.One step Technology for Heating Processing is relatively simple
Production technology, and more efficiently and energy-conservation heat treatment process, it is easy to accomplish actual industrial production.Herein by experiment,
Determine the industrial Composition Control scope of one-step method, and rolling and heat treatment optimal processing parameter,
In the published patent about third generation automobile with Q＆P steel, Chinese patent application CN201310051807.3,
A kind of method that utilization alloying element partition prepares silicomanganese system Q＆P steel is described, which adopts rational Design of Chemical Composition, profit
With alloying element in the coexistence region partition mechanism of action, low carbon high-strength Q＆P steel is prepared.Chinese patent application
CN201310520580.2, disclosure describe a kind of two-step method Q＆P980 Heat-Treatment of Steel technique, and wherein tensile strength reaches
1000MPa, strength and ductility product reach more than 25GPa %.Two above invention is mainly produced by two-step method Q＆P technique, phase
Than in one-step method, consuming energy, efficiency is low, and two-step method production cannot meet the heat-treatment production line of some enterprises, and one-step method
Although plasticity is high without two-step method, its tensile strength 200-400MPa higher than two-step method, strength and ductility product can also reach
The level of more than 20GPa %.After the present invention adds titanium and vanadium so as to which intensity is higher, and plasticity is not almost reduced.So
The one-step method Q＆P technique of this paper be with energy-conservation, efficient manufacture method.
In sum, at present developing stage is in Q＆P steel for third generation automobile, for titaniferous and the one-step method of vanadium
Q＆P technique at home and abroad has not been reported.As the one-step method Q＆P technique of titaniferous and vanadium is had relatively in process of production with two-step method
Big difference, the mainly more difficult control of hardening heat.It is thus desirable to according to the research in laboratory, designing and technique in metallurgically
New design and processes route is taken in control, meets the third generation of performance requirement with low cost, low energy consumption and high efficiency production
Automobile steel, to meet the market demand.
Content of the invention
In order to solve the above problems, it is an object of the invention to provide a kind of low production cost, the time is short, efficiency high, section
Can, and the vanadium of stable performance and titanium are combined Q＆P steel and its manufacture method of interpolation.
Present invention employs following technical scheme：Vanadium and titanium are combined the Q＆P steel of interpolation, the main component of the Q＆P steel and weight
Measuring degree is：C 0.17～0.22%, Si 1.3～1.6%, Mn 1.5～2.2%, P≤0.010%, S≤
0.008%th, V 0.03～0.07%, Ti 0.02～0.04%, balance of Fe and inevitable impurity.
It is a further object of the present invention to provide above-mentioned vanadium and titanium are combined the manufacture method of the Q＆P steel of interpolation, specifically include with
Lower step：
1. dispensing：Each raw material is weighed respectively according to design composition, mix, melting strand is carried out, obtains slab；
Step 2. hot rolling technology：Slab prepared by step 1 is heated to 1170～1220 DEG C from room temperature, and insulation 1.5～2 is little
When, it is 1150 DEG C of open rollings in temperature, hot rolling finishing temperature is 890～920 DEG C, will be empty for the slab after hot rolling on section cooling line
Start water-cooled when being cooled to 780～820 DEG C, cooling rate controls in 15-25 DEG C/s, is cooled to below starting to batch when 200 DEG C, makes hot rolled plate
Be organized as ferrite+martensite+bainite, hot rolling thickness of slab 3.5-4.5mm；
Step 3. cold-rolling process：Step 2 is obtained hot rolled plate cold rolling through carrying out after overpickling, cold rolling reduction ratio 50～
70%, cold rolling thickness of slab 1.4-1.7mm；
Step 4. continuous annealing process：Step 3 is obtained cold-reduced sheet 780～820 DEG C are heated to 10 DEG C/s from room temperature, insulation
Time be 120～150s, be cooled to 170～210 DEG C with 30～50 DEG C/s, be incubated 100～150s, after be cooled to room temperature, obtain final product
To automobile steel.
C：It is traditional, the economic intensified element of mild steel, the intensity of steel is improved with the increase of carbon content.In one-step method Q＆
During the partition of P steel, C from martensite to austenite in spread, play a part of stable austenite, make the residual austenite in steel
Body increases, and improves the strength and ductility product of steel.
Si：Being the basic element in steel, deoxidation being played in steelmaking process, during the partition of Q＆P steel, Si is played
Prevent the formation of cementite, so that C cementite is not formed in partition and is fully spread in austenite.
Mn：Used as the basic component of low-alloy steel, Mn plays solution strengthening in steel, and in Q＆P steel, Mn can
To play a part of stable austenite.
V：V can improve the quenching degree of steel, dissolve in invigoration effect in ferrite, can form stable carbide,
Crystal grain thinning, N can strengthen the effect of V.The method that can be combined using the crystal grain refinement of the precipitation strength of V and Ti is obtained more
Big reinforcing effect.
Ti：It is micro alloying element, in steel, adds a small amount of Ti that the intensity of steel can be improved, play precipitation strength and crystal grain
The effect of refinement.Wherein TiN can effectively prevent austenite crystal growing up in heating process, play fining austenite grains
Effect, and the toughness of steel can be improved.
The present invention is allowed to compared with two step method Q＆P technique and prior art due to employing above technical scheme, with
Lower advantage and good effect：
(1) the invention provides a kind of Q＆P steel that can be produced under traditional continuous annealing process and preparation method thereof, the method
Reheating partition process is needed not move through in continuous annealing, and it is appropriate that direct quenching passes through to insulation partition is necessarily stably carried out, only
Composition design and technology controlling and process, make yield strength reach 550～650MPa, tensile strength be 1350～1450MPa, have no progeny and stretch
Long rate >=15.0%, strength and ductility product >=22.0GPa %；
(2) the autobody sheet organization type that the present invention is manufactured is polygonal ferrite, martensite and retained austenite
Tissue, and the precipitate containing V, Ti, play a part of precipitation strength, compared to two step method Q＆P technique, its steel that produces
Plate intensity is high, and with certain plasticity, meets the standard of automobile steel high-strength tenacity；
(3) the Plate Production low cost that the present invention is manufactured, time are short, efficiency high, and energy-conservation, and stable performance have
Excellent obdurability coupling.By composition and technique adjustment, can promote in some enterprises that can not produce two step method Q＆P steel
One-step method Q＆P steel, is to realize enterprise's production line to establish base to high-performance, low cost, low energy consumption and the transformation of high efficiency production line
Plinth.
Description of the drawings
Fig. 1 is the pass with energy-conservation, the hardening heat of efficient Q＆P steel and performance that the vanadium of the present invention and titanium are combined interpolation
System's figure.Wherein abscissa is temperature, and ordinate is tensile strength and strength and ductility product.
Fig. 2 is the hot rolling metallograph with energy-conservation, efficient Q＆P steel that the vanadium of the present invention and titanium are combined interpolation.
Fig. 3 for the vanadium of the present invention and titanium be combined interpolation with the metallographic after energy-conservation, efficient Q＆P Heat-Treatment of Steel
Photo；190 DEG C of (a) partition temperature, 200 DEG C of (b) partition temperature, 210 DEG C of (c) partition temperature.
Fig. 4 is the transmission electron microscope photo of different austenite patterns after heat treatment.
Specific embodiment
With the drawings and specific embodiments, the present invention is further detailed explanation below.
Embodiment 1：
Be first according to mentioned component scope carry out smelting, continuous casting, then detect the composition of strand, see the table below 1.
The composition (wt.%) of 1 strand of table
Hot rolling adopts following technique：The strand of preparation is heated to 1200 DEG C from room temperature, 2 hours are incubated, start rolling temperature is
1150 DEG C, hot rolling finishing temperature is 900 DEG C, starts water-cooled when the slab after hot rolling being air cooled to 800 DEG C on section cooling line,
Cooling rate is in 20 DEG C/s, is cooled to below starting to batch when 190 DEG C.At this moment hot rolled plate be organized as ferrite+martensite+bayesian
Body, is shown in Fig. 2, and hot rolling thickness of slab is 3.6mm.Cold-rolling process is as follows：By hot rolled plate through carrying out cold rolling, cold rolling reduction ratio after overpickling
58%, cold rolling thickness of slab 1.5mm.Take 3 examples below, be different partition temperature, then carry out performance detection.
Cold-reduced sheet is heated to 800 DEG C with 10 DEG C/s from room temperature, and temperature retention time is 150s, 190 DEG C is cooled to 50 DEG C/s,
Insulation 100s, after be cooled to room temperature, performance is shown in Table 2.
The performance of Q＆P steel when 2 partition temperature of table is 190 DEG C
Each mechanical property all reaches required performance indications as can be seen from the above table, and tensile strength is 1389MPa, stretches
Long rate is 17.5%, strength and ductility product 24.3GPa %.Wherein tensile strength wants high 200MPa or so compared to two-step method.Metallographic shines
Shown in piece such as Fig. 3 (a), it is made up of ferrite, martensite and retained austenite.
Embodiment 2：
Be first according to mentioned component scope carry out smelting, continuous casting, then detect the composition of strand, see the table below 3.
The composition (wt.%) of 3 strand of table
Hot rolling adopts following technique：The strand of preparation is heated to 1170 DEG C from room temperature, 1.7 hours is incubated, start rolling temperature
For 1150 DEG C, hot rolling finishing temperature is 920 DEG C, starts water when the slab after hot rolling being air cooled to 820 DEG C on section cooling line
Cold, cooling rate is in 25 DEG C/s, is cooled to below starting to batch when 190 DEG C.At this moment hot rolled plate be organized as ferrite+martensite+shellfish
Family name's body, is shown in Fig. 2, and hot rolling thickness of slab is 3.5mm.Cold-rolling process is as follows：Hot rolled plate is cold rolling through carrying out after overpickling, under cold rolling
Rate 70%, cold rolling thickness of slab 2.45mm.Take 3 examples below, be different partition temperature, then carry out performance detection.
Cold-reduced sheet is heated to 780 DEG C with 10 DEG C/s from room temperature, and temperature retention time is 135s, 200 DEG C is cooled to 40 DEG C/s,
Insulation 130s, after be cooled to room temperature, performance is shown in Table 4.
The performance of Q＆P steel when 4 partition temperature of table is 200 DEG C
Each mechanical property all reaches required performance indications as can be seen from the above table, and tensile strength is 1364MPa, stretches
Long rate is 19.7%, strength and ductility product 26.9GPa %.Wherein tensile strength wants high 200MPa or so compared to two-step method.Metallographic shines
Shown in piece such as Fig. 3 (b), it is made up of ferrite, martensite and retained austenite.
Embodiment 3：
Be first according to mentioned component scope carry out smelting, continuous casting, then detect the composition of strand, see the table below 5.
The composition (wt.%) of 5 strand of table
Hot rolling adopts following technique：The strand of preparation is heated to 1220 DEG C from room temperature, 1.5 hours is incubated, start rolling temperature
For 1150 DEG C, hot rolling finishing temperature is 890 DEG C, starts water when the slab after hot rolling being air cooled to 780 DEG C on section cooling line
Cold, cooling rate is in 15 DEG C/s, is cooled to below starting to batch when 190 DEG C.At this moment hot rolled plate be organized as ferrite+martensite+shellfish
Family name's body, is shown in Fig. 2, and hot rolling thickness of slab is 4.5mm.Cold-rolling process is as follows：Hot rolled plate is cold rolling through carrying out after overpickling, under cold rolling
Rate 50%, cold rolling thickness of slab 2.1mm.Take 3 examples below, be different partition temperature, then carry out performance detection.
Cold-reduced sheet is heated to 820 DEG C with 10 DEG C/s from room temperature, and temperature retention time is 120s, 210 DEG C is cooled to 30 DEG C/s,
Insulation 100s, after be cooled to room temperature, performance is shown in Table 6.
The performance of Q＆P steel when 6 partition temperature of table is 210 DEG C
Each mechanical property all reaches required performance indications as can be seen from the above table, and tensile strength is 1351MPa, stretches
Long rate is 17.6%, strength and ductility product 23.8GPa %.Wherein tensile strength wants high 200MPa or so compared to two-step method.Metallographic shines
Shown in piece such as Fig. 3 (c), it is made up of ferrite, martensite and retained austenite.
Transmission electron microscope photo such as Fig. 4 of above-mentioned three kinds different partition temperature, wherein includes the photograph of different austenite patterns
Piece, wherein (a) are the film-form austenite between martensite lath, and (b) is transgranular block austenite, and (c) is transgranular strip
Austenite.There is portion of residual austenite in steel, makes steel, in deformation, TRIP effect occur, increase the strong plasticity of steel.To sum up may be used
See, the steel plate in the present invention has excellent toughness and tenacity.
It should be noted last that, above example is only in order to illustrate technical scheme and unrestricted.Although ginseng
The present invention is described in detail according to embodiment, it will be apparent to an ordinarily skilled person in the art that the technical side to the present invention
Case is modified or equivalent, and without departure from the spirit and scope of technical solution of the present invention, which all should be covered in the present invention
Right in the middle of.
Claims (1)
1. a kind of vanadium and titanium are combined the manufacture method of the Q＆P steel of interpolation, the predominant quantity percentage of the Q＆P steel
Than for：C 0.17~0.22%、Si 1.3~1.6%、Mn 1.5~2.1%、P ≤ 0.010%、S ≤ 0.008%、V 0.03~
0.07%th, Ti 0.02 ~ 0.04%, balance of Fe and inevitable impurity, it is characterised in that manufacture method specifically include with
Lower step：
Step 1. dispensing：Each raw material is weighed respectively according to design composition, mix, melting strand is carried out, obtains slab
；
Step 2. hot rolling technology：Slab prepared by step 1 is heated to 1170 ~ 1220 DEG C from room temperature, is incubated 1.5 ~ 2 hours,
Temperature is 1150 DEG C of open rollings, and hot rolling finishing temperature is 890 ~ 920 DEG C, is air cooled to the slab after hot rolling on section cooling line
Start water-cooled when 780 ~ 820 DEG C, cooling rate controls in 15-25 DEG C/s, is cooled to below starting to batch when 200 DEG C, makes the group of hot rolled plate
It is woven to ferrite+martensite+bainite, hot rolling thickness of slab 3.5-4.5 mm；
Step 3. cold-rolling process：Step 2 is obtained hot rolled plate cold rolling through carrying out after overpickling, cold rolling reduction ratio 50 ~
70%, cold rolling thickness of slab 1.4-1.7 mm；
Step 4. continuous annealing process：Step 3 being obtained cold-reduced sheet and 780 ~ 820 DEG C being heated to 10 DEG C/s from room temperature, temperature retention time is
120 ~ 150 s, are cooled to 170 ~ 210 DEG C with 30 ~ 50 DEG C/s, be incubated 100 ~ 150 s, after be cooled to room temperature, that is, obtain vapour
Automobile-used steel.
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| CN201510482908.5A CN105018843B (en) | 2015-08-03 | 2015-08-03 | Vanadium and titanium are combined the Q＆P steel of interpolation and its manufacture method |
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| CN105018843B true CN105018843B (en) | 2017-03-08 |
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| WO2017168957A1 (en) * | 2016-03-31 | 2017-10-05 | Ｊｆｅスチール株式会社 | Thin steel sheet, plated steel sheet, method for producing hot-rolled steel sheet, method for producing cold-rolled full hard steel sheet, method for producing thin steel sheet, and method for producing plated steel sheet |
| CN108486494B (en) * | 2018-06-05 | 2019-06-21 | 西北工业大学 | The production method of vanadium micro-alloying 1300MPa grade high-strength hot rolled steel plate and cold-rolled biphase steel plate |
| CN111118397A (en) * | 2020-01-19 | 2020-05-08 | 攀钢集团攀枝花钢铁研究院有限公司 | 980 MPa-grade quenching distribution steel and preparation method thereof |
| CN111440987B (en) * | 2020-05-11 | 2021-03-02 | 武汉钢铁有限公司 | Quenching distribution steel with tensile strength of more than or equal to 980MPa produced by adopting short process and method |
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| US20060011274A1 (en) * | 2002-09-04 | 2006-01-19 | Colorado School Of Mines | Method for producing steel with retained austenite |
| CN101775470A (en) * | 2010-03-02 | 2010-07-14 | 武汉钢铁(集团)公司 | Production method of low-alloy complex-phase (Q and P) steel |
| CN103805851B (en) * | 2012-11-15 | 2016-03-30 | 宝山钢铁股份有限公司 | A kind of superstrength low cost hot rolling Q & P steel and production method thereof |
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