CN102605240A - High-strength and high-plasticity dual-phase steel and manufacturing method thereof - Google Patents
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Abstract
The invention relates to high-strength and high-plasticity dual-phase steel and a manufacturing method thereof. The dual-phase steel comprises the chemical components in percentage by weight: 0.07-0.19% of C, 0.10-0.50% of Si, 1.00-2.30% of Mn, less than or equal to 0.020% of P, less than or equal to 0.015% of S, less than or equal to 0.008% of N, 0.02-0.07% of Al, less than or equal to 0.40% of Mo, less than or equal to 0.06% of Nb, and the balance of Fe and other inevitable impurities. According to the invention, by controlling the soaking temperature, slow cooling speed, slow cooling temperature, quick cooling temperature and the like of the continuous annealing process, the high-strength and high-plasticity dual-phase steel with martensite, epitaxial ferrite and residual ferritic structure can be manufactured; and continuous annealing line with a high-speed and high-hydrogen gas jet cooler is adopted, so that the content of alloy elements in the steel can be reduced, and the shaping and welding properties of steel plates can be ensured.
Description
Technical field
The present invention relates to a kind of dual phase steel and working method thereof, relate in particular to a kind of dual phase steel and working method thereof with HS and high-ductility.
Background technology
Dual phase steel is the steel of mainly being made up of ferritic and martensite, and the martensite volume(tric)fraction is generally 10～35% in its microstructure.Dual phase steel has low, the no elongation at yield point of yield-point, initial manufacture hardening rate height and intensity and plasticity and characteristics such as matches, and is that the good new automobile of a kind of intensity high formability is used steel.
Energy-conservation and along with the loss of weight of Hyundai Motor industry to the improving constantly of security requirement, particularly, require employed ferrous materials must have HS along with the going deep into of car body lightweight technical study, guarantee good plasticity simultaneously.The result of study that the ULSAB that is subsidized by world-renowned Iron And Steel Company plans shows; In order to continue the superiority of steel with respect to other competitive materials; Essential a large amount of plow-steel that uses; In the new model C level car of representing the automobile steel future thrust and PNGV level car, the dual phase steel of phase transformation strengthening has accounted for entire structure with more than 72% of steel.
Usually, the cold-rolled biphase steel plate adopts the production of continuous annealing unit, and the typical process flow of cold-rolled biphase steel continuous annealing is:
Uncoiling-cleaning-heating-soaking-cooling-overaging fast-secondary cooling-smooth-finishing-cold-rolled biphase steel.
Simultaneously; Because high strength dual phase steel is requiring high-intensity forming property and the welding property preferably of requiring simultaneously; Therefore very high to the requirement of metallurgical technology controlled levels, how to guarantee the high-intensity while of dual phase steel, improving its plasticity is the emphasis of each Iron And Steel Company's research.
One Chinese patent application numbers 200510027399.3 provides a kind of 1180Mpa ultra-high strength strip steel and working method thereof; The chemical ingredients of this ultra-high strength strip steel is C:0.10～0.20wt.%, Si:＜0.6wt.%, Mn:＜2.6wt.%; Cr:0.35～0.90wt.%; Nb:0.015～0.050wt.%, Ti:0.015～0.050wt.%, B:0.0005～0.0030wt.%; All the other are iron and unavoidable impurities, and its production technique comprises: smelting, casting, hot rolling, pickling, cold rolling and continuous annealing etc.Adopt the cold or high speed jet method of cooling of roller during the super-high strength steel continuous annealing of this patent.Do not adopt shrend or aerosol fast-cooling technology during the annealing of the super-high strength steel of this patent, saved pickling, reheat or flash nickel operation, less demanding high-strength steel product such as can the butt welding of production part connect.The main drawback of this patent is: 1. this steel interalloy content is high; When continuous annealing, do not adopt fast cooling technologies such as Gao Qing, but adopt the roller refrigeration technique, so this steel not only is shaped and welding property is poor; And connect the easy sideslip of band steel when moving back production, produce unstable; 2. simply adopted after the soaking refrigerative annealing process fast, do not made full use of the slow cooling operation of continuous annealing process,, do not had high-ductility although the steel plate that therefore obtains has HS.
Summary of the invention
The present invention is directed to the above-mentioned deficiency that existing dual phase steel exists, a kind of dual phase steel and working method thereof with HS and high-ductility is provided.
The technical scheme that the present invention solves the problems of the technologies described above is following: a kind of chemical component weight per-cent with dual phase steel of HS and high-ductility is: C:0.07%～0.19%, Si:0.10%～0.50%, Mn:1.00%～2.30%, P :≤0.020%, S≤0.015%, N≤0.008%, Al:0.02%～0.07%, Mo: Nb≤0.40% :≤0.06%, and all the other are Fe and inevitable impurity.
On the basis of technique scheme, the present invention can also do following improvement.
The present invention also provides a kind of technical scheme that solves the problems of the technologies described above following: a kind of working method with dual phase steel of HS and high-ductility may further comprise the steps:
Step a: the composition by the above-mentioned dual phase steel with HS and high-ductility is smelted, and casts blank;
Step b: the blank hot charging that will cast is gone into stove, 500～800 ℃ of hot charging temperature, and carry out hot rolling, curling, pickling and cold rolling successively;
Step c: the method that the steel plate after rolling adopts soaking, slow cooling and quick cooling to combine is carried out continuous annealing, and the method for cooling of high hydrogen high-speed gas injection is adopted in said quick cooling;
Steps d: the steel plate after will annealing carries out smooth and finishing successively.
Further, the temperature of curling among the said step b is 560～660 ℃, and cold rolling reduction is 40%～62%.
Further, H in the high hydrogen high-speed gas among the said step c
2Concentration is 20～70%, and all the other are N
2
Further, soaking temperature in the continuous annealing among the said step c: 750～820 ℃, 3～30 ℃/s of slow cooling speed; Slow cooling temperature: 580～750 ℃; The band steel is at the average cooling rate of rapid chilling section: 40～150 ℃/s, and fast cold temperature: 270～380 ℃, aging temp≤380 ℃.
Further, smooth unit elongation is 0.1～0.6% in the said steps d.
The invention has the beneficial effects as follows: the present invention is through suitable composition design and processes design; Adopt the continuous annealing process that combines to have slow cooling; Through soaking temperature, slow cooling speed, slow cooling temperature and the fast cold temperature etc. of strictness control continuous annealing process, can produce high-strength high-plasticity dual phase steel with martensite, epitaxy ferritic and residual ferritic structure; The present invention adopts the continuous annealing line production with jet refrigerating unit of the high hydrogen of high speed (20～70% hydrogen content), can reduce steel interalloy constituent content, guarantees the shaping and the welding property of steel plate; High strength cold-rolled dual phase steel provided by the invention, its tensile strength are that 700～1200MPa, unit elongation are 12～25%, can well satisfy the requirement of automobile industry to high-strength steel.
Embodiment
Below principle of the present invention and characteristic are described, institute gives an actual example and only is used to explain the present invention, is not to be used to limit scope of the present invention.
The present invention improves the intensity of steel through multiple strengthening mechanisms such as phase transformation strengthening, dispersion-strengthened and refined crystalline strengthenings; And introduce the epitaxy ferritic through adding at ferritic in the martensitic stucture, improve the plasticity of steel through the ferritic amount of control epitaxy, the tensile strength that obtains tissue signatures such as ferritic, epitaxy ferritic and martensite and additional dispersion-strengthened particle is that 700～1200MPa and unit elongation El are 12～25% high strength dual phase steel.
Principle of design of the present invention is following:
The intensity of dual phase steel and plasticity depend primarily on ferritic and the martensitic stucture in the tissue.In order to improve its plasticity, should improve ferritic plasticity, and, should make to obtain certain martensite volume in the tissue and guarantee its intensity in order to improve its intensity.Therefore, the present invention adopts the method that obtains certain martensite volume to guarantee the HS of this steel, and is different with other method simultaneously, and the present invention adopts and obtains the ferritic method of a certain amount of epitaxy and improve ferritic plasticity, and and then improves the plasticity of steel plate.
Be added with elements such as Nb in the dual phase steel of the present invention with crystal grain thinning; While Nb etc. can form NbC, NbN, Nb dispersion-strengthened particles such as (C, N) in tissue; And the ferritic structure plasticity that contains this dispersed granules is relatively poor; The present invention makes full use of the slow cooling operation of continuous annealing process; Through the soaking-slow cooling-quick epitaxy ferritic that waits the gentle speed of cooling of each key point temperature to obtain a certain amount of no dispersed granules that cools off of control continuous annealing process, to improve the plasticity of ferritic plasticity and then raising dual phase steel.
In addition; Adding the C curve that Mn, Mo etc. make steel in the dual phase steel of the present invention moves to right to improve the hardening capacity of steel; Content through control C, Mn, P, S is to improve the welding property and the plasticity of steel; The content of strict control O, H to be reducing oxide inclusion and hydrogen induced cracking, and the cooling through the control continuously cast bloom, employing hot charging (500～800 ℃ of hot charging temperature) etc. prevent that the measure of slab rimose from obtaining the high-quality strand; Through take to improve hot-rolled process parameter particularly the hot rolling reeling temperature control precision to reduce the mechanical property fluctuation of hot-rolled sheet; Combine the quick process for cooling of slow refrigerative through on continuous annealing line, adopting, strict control connects key parameters such as moving back soaking temperature, slow cooling speed, slow cooling temperature, speed of cooling, fast cold temperature, aging temp and smooth unit elongation and realizes the control to the two-phase steel organization performance.
Specify effect and the mentality of designing of technical data of each chemical element that the present invention has the dual phase steel of HS and high-ductility below.
C: be strengthening element the most basic in the steel, C influences the welding property of steel simultaneously, and therefore, under the prerequisite of considering intensity, the content of carbon is hanging down of control as far as possible.Among the present invention, C content is 0.07～0.19%.
Si: be the solution strengthening element, favourable to the intensity that improves steel plate, be unfavorable for the welding property of steel when content is high.Among the present invention, Si content is 0.10～0.50%.
Mn: be the solution strengthening element, and improve austenitic hardening capacity, can reduce the solid solution C in the ferritic simultaneously, thereby improve the ductility of dual phase steel.The Mn too high levels is unfavorable for welding property, and among the present invention, Mn content is decided to be 1.00～2.30%.
Mo: be strengthening element, and improve austenitic hardening capacity, in addition, can improve precipitating reinforcing effect with the Nb cooperation.The Mo too high levels is unfavorable for welding property, and among the present invention, Mo content is≤0.40%.
Nb: strong carbon, nitride forming element, improve armor plate strength through grain refining, can also form dispersion-strengthened particles such as NbC, NbN, increase the strength of materials.Among the present invention, Nb content is≤0.06%.
Al: be deoxidant element, can form AlN particle crystal grain thinning simultaneously.Al is not obvious less than effect in 0.005% o'clock, and surpassing at 0.% o'clock can increase the inclusion amount, influences plasticity, and Al content is 0.02～0.07% among the present invention.
The mentality of designing of production technology parameter:
The too high then iron scale of hot rolling reeling temperature can thicken, follow-up pickling difficulty, and coiling temperature crosses that hot-rolled substrate tissue increases substantially hot-rolled substrate intensity refinement when low, influences follow-up cold continuous rolling and is out of shape, and coiling temperature of the present invention is decided to be 560～660 ℃.
The main purpose of pickling and cold-rolling is to improve the surface quality and the thickness and precision of material, and cold rolling reduction hour is difficult to achieve the above object very much, but cold rolling reduction is when excessive, and the cold rolling process energy consumption obviously increases, and plate shape is also worsened.Cold rolling reduction is decided to be 40～62% among the present invention.
The processing parameter of continuous annealing is determining the internal organizational structure and the mechanical property of material.The present invention through chemical ingredients and production technique particularly the appropriate design of continuous annealing process technical parameter can obtain weave construction and the mechanical property that the present invention has the dual phase steel of HS and high-ductility.Following brief description is following:
Soaking: the height of soaking temperature has determined material at high temperature to be in the austenite one phase district or has been in austenite and ferritic two-phase region and this two ratios mutually.Among the present invention, the two-phase region soaking temperature is 750～820 ℃, adds the part ferritic structure to obtain austenite.
Slow cooling: have influence on the plate shape of high-strength steel, the more important thing is, slow cooling is the key link of organizational controls.The present invention controls the austenite-ferrite phase transformation through control slow cooling temperature, obtains austenite, epitaxy ferritic and residual ferritic structure.Among the present invention, slow cooling speed is 3～30 ℃/s, and the slow cooling temperature is 580～750 ℃.
Cold soon: as to adopt high hydrogen high-speed gas injection cooling (H
2Concentration is 20～70%) method, realize the quick cooling of steel plate, accomplish the austeno-martensite phase transformation.Among the present invention, fast cold temperature is 270～380 ℃.
Timeliness: the height of aging temp will influence the martensitic decomposition and second the separating out mutually, and generally speaking the aging temp raising can make the strength of materials and decrease of hardness and plasticity improves, and vice versa.Among the present invention, aging temp≤380 ℃.
Smooth: the size of smooth unit elongation mainly influences YIELD STRENGTH and plasticity, also can influence plate of material shape.Generally speaking, improve smooth unit elongation material yield intensity will be improved, decrease ductility, plate shape will make moderate progress, but smooth unit elongation is unfavorable for the forming property of material when too big.Among the present invention, smooth unit elongation is 0.1～0.6%.
Have the different of the chemical ingredients, hot rolling of the dual phase steel of HS and high-ductility, cold rolling, continuous annealing and flattening technological parameter according to invention below, come the present invention is further specified through embodiment 1～8.
The Chemical Composition of molten steel is seen table 1, and surplus is Fe and unavoidable impurities element.
Table 1 embodiment and the chemical ingredients (%) that contrasts patent
| Embodiment | C | Si | Mn | Cr | Mo | Nb | Ti | B | N | Al | P | S |
| 1 | 0.07 | 0.2 | 1.3 | ---- | ---- | ---- | ---- | ---- | 0.004 | 0.04 | 0.016 | 0.006 |
| ?2 | 0.08 | 0.3 | 1.3 | ---- | 0.01 | ---- | ---- | ---- | 0.005 | 0.03 | 0.015 | 0.003 |
| ?3 | 0.11 | 0.1 | 1.5 | ---- | ---- | 0.025 | ---- | ---- | 0.004 | 0.03 | 0.017 | 0.006 |
| ?4 | 0.10 | 0.2 | 1.6 | ---- | 0.18 | 0.028 | ---- | ---- | 0.005 | 0.04 | 0.018 | 0.005 |
| ?5 | 0.14 | 0.3 | 1.8 | ---- | 0.21 | 0.027 | ---- | ---- | 0.005 | 0.05 | 0.015 | 0.005 |
| ?6 | 0.15 | 0.4 | 1.7 | ---- | 0.22 | 0.030 | ---- | ---- | 0.003 | 0.05 | 0.019 | 0.007 |
| ?7 | 0.17 | 0.5 | 1.8 | ---- | 0.028 | 0.028 | ---- | ---- | 0.004 | 0.06 | 0.017 | 0.008 |
| ?8 | 0.18 | 0.4 | 2.0 | ---- | 0.015 | 0.025 | ---- | ---- | 0.005 | 0.04 | 0.018 | 0.006 |
| Comparative Examples 1 | 0.20 | 0.3 | 2.1 | 0.4 | 0.04 | 0.04 | 0.02 | 0.0020 | 0.003 | 0.014 | 0.003 | |
| Comparative Examples 2 | 0.18 | 0.4 | 2.2 | 0.35 | 0.03 | 0.03 | 0.03 | 0.0018 | 0.003 | 0.018 | 0.004 |
Continuous casting steel billet batches after hot rolling, produces high-strength steel through CDCM unit (pickling and cold rolling) and CAL unit (continuous annealing and smooth) after the room temperature cooling.Its main technique technical parameter and the finished product mechanical property are seen table 2.
Table 2 embodiment and the main technique technical parameter and the product mechanical property that contrast patent
Visible by table 2; Compare with Comparative Examples; The dual phase steel that the present invention has HS and high-ductility adopts the jet method of cooling production of the high hydrogen of high speed when even moving back production; Cooling rate is exceedingly fast and is convenient to control, has high-strength high-plasticity and the good above super-high strength steel of tensile strength 1180MPa of welding property through controlling continuous annealing soaking temperature, slow cooling speed, slow cooling temperature and fast cold temperature, fast speed of cooling and timeliness temperature, can producing.Like embodiment 8; Through continuous annealing process parameter control (807 ℃ of soaking temperatures, 20 ℃/S of slow cooling speed, 660 ℃ of slow cooling temperature, 280 ℃ of fast cold temperature, 280 ℃ of aging temps), make the super-high strength steel of production reach tensile strength 1240Mpa, unit elongation 16%, and see from chemical ingredients; Its C, Mn content are not high; Element such as Nb, Mo also seldom, so steel-making continuous casting and hot rolling be easy to produce, and cold rollingly produce also very stable with continuous annealing.
The present invention is through suitable composition design and processes design; Adopt the continuous annealing process that combines to have slow cooling; Through soaking temperature, slow cooling speed, slow cooling temperature and the fast cold temperature etc. of strictness control continuous annealing process, can produce high-strength high-plasticity dual phase steel with martensite, epitaxy ferritic and residual ferritic structure.The present invention adopts the continuous annealing line production with jet refrigerating unit of the high hydrogen of high speed (20～70% hydrogen content), can reduce steel interalloy constituent content, guarantees the shaping and the welding property of steel plate.High strength cold-rolled dual phase steel provided by the invention, its tensile strength 700～1200MPa, unit elongation 12～25% can well satisfy the requirement of automobile industry to high-strength steel.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. dual phase steel with HS and high-ductility; It is characterized in that; Its chemical component weight per-cent is: C:0.07%～0.19%, Si:0.10%～0.50%, Mn:1.00%～2.30%, P :≤0.020%, S≤0.015%, N≤0.008%, Al:0.02%～0.07%, Mo: Nb≤0.40% :≤0.06%, and all the other are Fe and inevitable impurity.
2. the working method with dual phase steel of HS and high-ductility is characterized in that, may further comprise the steps:
Step a: smelt by the described composition of claim 1, cast blank with dual phase steel of HS and high-ductility;
Step b: the blank hot charging that will cast is gone into stove, 500～800 ℃ of hot charging temperature, and carry out hot rolling, curling, pickling and cold rolling successively;
Step c: the method that the steel plate after rolling adopts soaking, slow cooling and quick cooling to combine is carried out continuous annealing, and the method for cooling of high hydrogen high-speed gas injection is adopted in said quick cooling;
Steps d: the steel plate after will annealing carries out smooth and finishing successively.
3. the working method with dual phase steel of HS and high-ductility according to claim 2 is characterized in that, the temperature of curling among the said step b is 560～660 ℃, and cold rolling reduction is 40%～62%.
4. the working method with dual phase steel of HS and high-ductility according to claim 2 is characterized in that, H in the high hydrogen high-speed gas among the said step c
2Concentration is 20～70%, and all the other are N
2
5. the working method with dual phase steel of HS and high-ductility according to claim 2; It is characterized in that soaking temperature in the continuous annealing among the said step c: 750～820 ℃, 3～30 ℃/s of slow cooling speed; Slow cooling temperature: 580～750 ℃; The band steel is at the average cooling rate of rapid chilling section: 40～150 ℃/s, and fast cold temperature: 270～380 ℃, aging temp≤380 ℃.
6. the working method with dual phase steel of HS and high-ductility according to claim 2 is characterized in that, smooth unit elongation is 0.1～0.6% in the said steps d.
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Application publication date: 20120725 |