CN102277539A - High-strength steel with low yield ratio, high plasticity and ultrafine grain and preparation method thereof - Google Patents
High-strength steel with low yield ratio, high plasticity and ultrafine grain and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high-strength steel with low yield ratio, high plasticity and ultrafine grain and a preparation method thereof. The steel comprises the following chemical constituents in percentage by weight: 0.06-0.09% of C, 0.15-0.25% of Si, 1.20-1.50% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.020-0.040% of Nb, 0.010-0.030% of V, 0.008-0.015% of Ti, 0.10-0.30% of Cr, 0.10-0.30% of Ni, 0.10-0.30% of Cu, 0.010-0.050% of Al and the balance of Fe and inevitable impurities. According to a controlled rolling and controlled cooling technology, a bainite structure is obtained. According to a heat treatment technology, an ultrafine grain structure with bimodal distribution is obtained. The material has the characteristics of low yield ratio, super plasticity, high strength, and excellent overall properties. The preparation method has the advantages of stable production technology, strong maneuverability and low cost.
Description
Technical field
The present invention relates to a kind of high-strength steel, specifically a kind of low yield strength ratio high-plastic ultra-fine crystal grain high-strength steel and manufacture method thereof.
Background technology
Iron and steel was still and accounted for leading structured material 21 century, do not have a kind of material can the full substitution iron and steel.Along with society and expanding economy, Iron And Steel Industry is faced with the three big pressure of saving resource, save energy, protection environment.Therefore, improve steel product quality, reduce cost, exploitation and human friendly ferrous materials increase substantially its comprehensive mechanical property, have become the main direction of ferrous materials research.Wherein, adopting hot mechanical controlled rolling technology (TMCP) and deformation induced ferrite transformation technology (DIFT) to produce fine grain, high strength degree steel at low cost is the developing direction of current metallurgy industry.
Usually, the yield strength of steel and tensile strength are directly proportional with-1/2 power of crystal grain diameter d, grain refining will make the yield strength of steel and tensile strength significantly improve, but grain refining is bigger to the contribution of the contribution comparison tensile strength of yield strength, and the thin more yield tensile ratio of crystal grain is high more.The rising of yield tensile ratio will cause the cold forming capability of steel significantly to descend.In addition, crystal grain is thin more, and intensity improves, and the room temperature unit elongation is more little.Thereby high-yield-ratio, inductile are the difficult problems that existing ultra-fine brilliant production technology is still needed and solved.
Studies show that in recent years introduced an amount of thick relatively crystal grain in the ultrafine-grained (UFG) microstructure in steel, promptly cause the crystalline-granular texture of bimodal distribution of sizes, can greatly improve unit elongation under the very little situation of loss of strength.Chinese patent CN101225459A increases substantially steel plasticity by the method for thermal treatment+cold deformation has obtained to have bimodal distribution of sizes in the 14MnNb steel ultrafine-grained (UFG) microstructure.By the processing method of thermal treatment+warm deformation+cold deformation, in hypoeutectoid steel, obtained bimodal grain size distribution ultrafine-grained (UFG) microstructure among the Chinese patent CN 1632138A.But, by the problem of above-mentioned processing method and unresolved yield tensile ratio.As, the yield tensile ratio of the material that is obtained in Chinese patent CN 101225459A approaches 0.9.
Summary of the invention
In order under the condition of very small intensity loss, to improve the normal temperature plasticity of Ultrafine Grained Steel greatly, reduce yield tensile ratio, improve the cold forming capability of steel, widen Ultrafine Grained Steel structure applications scope, the purpose of this invention is to provide a kind of low yield strength ratio high-plastic ultra-fine crystal grain high-strength steel and manufacture method thereof.By the micro-alloy low-carbon steel of this art breading, have low yield strength ratio, high-ductility, high-intensity characteristic.This processing method is in conjunction with TMCP+ off-line heat-treatment technology method, can be applied to have the production of the Ultrafine Grained Steel sheet material of excellent comprehensive mechanical property economically.
A kind of low yield strength ratio high-plastic ultra-fine crystal grain high-strength steel, it is characterized in that: chemical ingredients is by weight percentage in this steel: C:0.06～0.09%, Si:0.15～0.25%, Mn:1.20～1.50%, P :≤0.015%, S :≤0.005%, Nb:0.020～0.040%, V:0.010～0.030%, Ti:0.008～0.015%, Cr:0.10～0.30%, Ni:0.10～0.30%, Cu:0.10～0.30%, Al:0.010～0.050%, surplus is Fe and unavoidable impurities.
Among the present invention, alloying elements such as Cr, Ni, Cu mainly play strengthening effect.
A kind of manufacture method of low yield strength ratio high-plastic ultra-fine crystal grain high-strength steel is characterized in that this manufacture method specific requirement is as follows:
Rolling technology: adopt cooling controlling and rolling controlling process, continuous blank heating temperature is 1180 ℃～1200 ℃ before rolling; Adopt austenite recrystallization district and the two stages controlled rolling of austenite non-recrystallization district, every time draft 10～15% of roughing, 1000～1050 ℃ of roughing finishing temperatures, roughing becomes the intermediate blank of 1.6 ~ 2.0 times of finished product thicknesses; The finish rolling start rolling temperature is 850～870 ℃, and every time draft is 10～15%, 800～830 ℃ of finish rolling finishing temperatures; Roll the back and adopt laminar flow cooling, 550～630 ℃ of final cooling temperatures, 7～10 ℃/s of rate of cooling, air cooling subsequently;
Thermal treatment process: the steel plate after the air cooling is heated again, and Heating temperature is between Ac
1～Ac
3Between, carry out the two-phase region quench treatment subsequently, quenching temperature is at 780～830 ℃, and soaking time is (1 ~ 3) min/mm * thickness of slab.Best soaking time is 2 min/mm * thickness of slab.
The present invention has obtained bainite structure by adopting cooling controlling and rolling controlling process (TMCP).By thermal treatment process, obtained to have the ultra-fine grained structure of bimodal distribution, steel plate yield strength 450～530MPa, tensile strength is 670～760MPa, unit elongation 〉=27%, yield tensile ratio Rt0.2/Rm≤0.70.
The present invention improves the yield strength and the tensile strength of steel plate by microalloying and controlled rolling and controlled cooling, increase precipitate by two-phase region quenching or tempering and separate out probability, obtain to have uniformly the superfine crystal particle ferrite structure of bimodal distribution, make material have characteristics such as low yield strength ratio, superplasticity, high strength.Stable processing technique, workable, cost is low, the material excellent combination property of acquisition.
The present invention has following advantage:
1, in steel, obtains to have the tissue of the different crystal grain of the thickness of bimodal distribution, remedy the lower phenomenon of simple ultra-fine grain steel plasticity.
2, by the brief heat treating method, give full play to the strengthening effect of disperse precipitated phase in the steel, the tensile strength of steel is significantly risen, yield tensile ratio descends, and yield tensile ratio is lower than 0.70.
3, manufacture method of the present invention is utilized TMCP technology commonly used, need not carry out more rambunctious in the operation of rolling as relaxation precipitation process or depress cold method soon greatly as low temperature in the DIFT technology, and this technological operation is easy, does not influence situ production rhythm.
The present invention utilizes TMCP+ off-line heat-treatment technology method, has obtained to have low yield strength ratio, the steel of high-ductility, high-intensity performance, and be organized as the superfine crystal particle structure of bimodal distribution of sizes.
Description of drawings
Fig. 1 is the MICROSTRUCTURE OF ULTRA-FINE GRAIN STEEL figure with bimodal distribution that embodiment 1 obtains by the TMCP+ intercritical hardening.
Fig. 2 is the MICROSTRUCTURE OF ULTRA-FINE GRAIN STEEL figure with bimodal distribution that embodiment 2 obtains by the inferior warm tempering of TMCP+.
Embodiment
A kind of low yield strength ratio high-plastic ultra-fine crystal grain high-strength steel, according to production technique of the present invention, it is as shown in table 1 to smelt the actual chemical ingredients of rolling steel grade of the present invention.
A kind of manufacture method of low yield strength ratio high-plastic ultra-fine crystal grain high-strength steel, this manufacture method specific requirement is as follows:
Rolling technology: adopt cooling controlling and rolling controlling process, continuous blank heating temperature is 1180 ℃～1200 ℃ before rolling; Adopt austenite recrystallization district and the two stages controlled rolling of austenite non-recrystallization district, every time draft 10～15% of roughing, 1000～1050 ℃ of roughing finishing temperatures, roughing becomes the intermediate blank of 1.6 ~ 2.0 times of finished product thicknesses; The finish rolling start rolling temperature is 850～870 ℃, and every time draft is 10～15%, 800～830 ℃ of finish rolling finishing temperatures; Roll the back and adopt laminar flow cooling, 550～630 ℃ of final cooling temperatures, 7～10 ℃/s of rate of cooling, air cooling subsequently; Carrying out TMCP in hot rolling workshop, to be rolled into 21mm thick, obtains bainite structure.
Thermal treatment process: the steel plate after the air cooling is reheated 780 ℃ in heat treatment furnace, under this temperature, be incubated 42min then.By precipitates such as Nb, V, N, reduce the loss of steel yield strength in the heat treatment process, increase substantially tensile strength, after finishing, insulation takes mode respectively with water quenching and air cooling.The mechanical property of handling back sheet material sees Table 2, microstructure is seen Fig. 1 and Fig. 2 respectively, ferrite is the weave construction of bimodal grain size distribution, wherein the volume fraction of the crystal grain of diameter below 1 μ m accounts for 50%, 5-10 μ m crystal particle volume mark accounts for 35%, and the volume fraction of all the other size range crystal grain accounts for 15%.
The chemical ingredients of table 1 embodiment of the invention (wt%)
| Embodiment | C | Si | Mn | P | S | Nb | V | Ti | Cu | Cr | Ni | Al t |
| Embodiment 1 | 0.072 | 0.20 | 1.55 | 0.010 | 0.0018 | 0.025 | 0.025 | 0.011 | 0.20 | 0.10 | 0.15 | 0.030 |
| Embodiment 2 | 0.080 | 0.25 | 1.35 | 0.013 | 0.0027 | 0.026 | 0.020 | 0.012 | 0.25 | 0.15 | 0.16 | 0.025 |
Mechanical property after the thermal treatment of table 2 embodiment of the invention
The present invention improves the yield strength and the tensile strength of steel plate by microalloying and controlled rolling and controlled cooling, increase precipitate by the two-phase region quenching and separate out probability, obtain to have uniformly the superfine crystal particle ferrite structure of bimodal distribution, make material have characteristics such as low yield strength ratio, superplasticity, high strength.Stable processing technique, workable, cost is low, the material excellent combination property of acquisition.
Claims (4)
1. low yield strength ratio high-plastic ultra-fine crystal grain high-strength steel, it is characterized in that: chemical ingredients is by weight percentage in this steel: C:0.06～0.09%, Si:0.15～0.25%, Mn:1.20～1.50%, P :≤0.015%, S :≤0.005%, Nb:0.020～0.040%, V:0.010～0.030%, Ti:0.008～0.015%, Cr:0.10～0.30%, Ni:0.10～0.30%, Cu:0.10～0.30%, Al:0.010～0.050%, surplus is Fe and unavoidable impurities.
2. the manufacture method of the described low yield strength ratio high-plastic ultra-fine of claim 1 a crystal grain high-strength steel is characterized in that this manufacture method specific requirement is as follows:
Rolling technology: adopt cooling controlling and rolling controlling process, continuous blank heating temperature is 1180 ℃～1200 ℃ before rolling; Adopt austenite recrystallization district and the two stages controlled rolling of austenite non-recrystallization district, every time draft 10～15% of roughing, 1000～1050 ℃ of roughing finishing temperatures, roughing becomes the intermediate blank of 1.6 ~ 2.0 times of finished product thicknesses; The finish rolling start rolling temperature is 850～870 ℃, and every time draft is 10～15%, 800～830 ℃ of finish rolling finishing temperatures; Roll the back and adopt laminar flow cooling, 550～630 ℃ of final cooling temperatures, 7～10 ℃/s of rate of cooling, air cooling subsequently;
Thermal treatment process: the steel plate after the air cooling is heated again, and Heating temperature is between Ac
1～Ac
3Between, carry out the two-phase region quench treatment subsequently, quenching temperature is at 780～830 ℃, and soaking time is (1 ~ 3) * thickness of slab min, obtains low yield strength ratio high-plastic ultra-fine crystal grain high-strength steel.
3. the manufacture method of low yield strength ratio high-plastic ultra-fine crystal grain high-strength steel according to claim 2 is characterized in that: the low yield strength ratio high-plastic ultra-fine crystal grain high-strength steel metallographic structure that obtains is the ferrite superfine crystal particle structure with bimodal distribution.
4. the manufacture method of low yield strength ratio high-plastic ultra-fine crystal grain high-strength steel according to claim 2, the yield strength of the low yield strength ratio high-plastic ultra-fine crystal grain high-strength steel that obtains is 450～530MPa, tensile strength is 670～760MPa, unit elongation 〉=27%, yield tensile ratio Rt0.2/Rm≤0.70.
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| CN103255273A (en) * | 2013-05-20 | 2013-08-21 | 南京钢铁股份有限公司 | Manufacturing method capable of improving plasticity of pipeline steel plate |
| CN103667905A (en) * | 2013-12-04 | 2014-03-26 | 武汉钢铁(集团)公司 | Ultra-fine grain structural steel with excellent plasticity and toughness and production method thereof |
| CN103774051A (en) * | 2012-10-25 | 2014-05-07 | 吴雪 | High-strength steel |
| CN103773935A (en) * | 2012-10-25 | 2014-05-07 | 吴雪 | Process for rolling low yield ratio and high plasticity steel plate with thickness of 40 nm |
| CN103774050A (en) * | 2012-10-25 | 2014-05-07 | 吴雪 | High-ductility steel with low yield ratio |
| CN103774052A (en) * | 2012-10-25 | 2014-05-07 | 吴雪 | Method for preparing high-strength steel plate with thickness of 20 mm |
| CN103993241A (en) * | 2014-05-30 | 2014-08-20 | 秦皇岛首秦金属材料有限公司 | Hot-rolled flat plate for composite acid-resistant pipeline steel base and production method thereof |
| CN104264069A (en) * | 2014-09-30 | 2015-01-07 | 江阴兴澄特种钢铁有限公司 | Super-thick X70 pipeline steel and manufacturing method thereof |
| CN108474082A (en) * | 2015-12-23 | 2018-08-31 | Posco公司 | The high manganese steel sheet and its manufacturing method of vibrationproof excellent |
| CN109161793A (en) * | 2018-08-29 | 2019-01-08 | 河钢股份有限公司 | A kind of low yield strength ratio high-strength weathering steel and its production method |
| CN109338228A (en) * | 2018-11-21 | 2019-02-15 | 钢铁研究总院 | A kind of high conductivity anode steel claw steel and preparation method thereof |
| CN112143959A (en) * | 2019-06-27 | 2020-12-29 | 宝山钢铁股份有限公司 | Steel plate with low yield ratio, high toughness and excellent weldability and manufacturing method thereof |
| CN112251687A (en) * | 2020-10-30 | 2021-01-22 | 江苏永钢集团有限公司 | High-performance fine-grained steel with uniform grains and preparation method thereof |
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| CN102080192A (en) * | 2011-01-07 | 2011-06-01 | 南京钢铁股份有限公司 | Low-yield ratio, high-plasticity, ultrafine-grain and high-strength steel and manufacturing method thereof |
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| CN103774051A (en) * | 2012-10-25 | 2014-05-07 | 吴雪 | High-strength steel |
| CN103773935A (en) * | 2012-10-25 | 2014-05-07 | 吴雪 | Process for rolling low yield ratio and high plasticity steel plate with thickness of 40 nm |
| CN103774050A (en) * | 2012-10-25 | 2014-05-07 | 吴雪 | High-ductility steel with low yield ratio |
| CN103774052A (en) * | 2012-10-25 | 2014-05-07 | 吴雪 | Method for preparing high-strength steel plate with thickness of 20 mm |
| CN103255273A (en) * | 2013-05-20 | 2013-08-21 | 南京钢铁股份有限公司 | Manufacturing method capable of improving plasticity of pipeline steel plate |
| CN103667905A (en) * | 2013-12-04 | 2014-03-26 | 武汉钢铁(集团)公司 | Ultra-fine grain structural steel with excellent plasticity and toughness and production method thereof |
| CN103993241A (en) * | 2014-05-30 | 2014-08-20 | 秦皇岛首秦金属材料有限公司 | Hot-rolled flat plate for composite acid-resistant pipeline steel base and production method thereof |
| CN104264069A (en) * | 2014-09-30 | 2015-01-07 | 江阴兴澄特种钢铁有限公司 | Super-thick X70 pipeline steel and manufacturing method thereof |
| CN104264069B (en) * | 2014-09-30 | 2016-08-17 | 江阴兴澄特种钢铁有限公司 | A kind of special think gauge X70 pipe line steel and manufacture method thereof |
| CN108474082A (en) * | 2015-12-23 | 2018-08-31 | Posco公司 | The high manganese steel sheet and its manufacturing method of vibrationproof excellent |
| CN109161793A (en) * | 2018-08-29 | 2019-01-08 | 河钢股份有限公司 | A kind of low yield strength ratio high-strength weathering steel and its production method |
| CN109161793B (en) * | 2018-08-29 | 2020-08-04 | 河钢股份有限公司 | Low-yield-ratio high-strength weathering steel and production method thereof |
| CN109338228A (en) * | 2018-11-21 | 2019-02-15 | 钢铁研究总院 | A kind of high conductivity anode steel claw steel and preparation method thereof |
| CN112143959A (en) * | 2019-06-27 | 2020-12-29 | 宝山钢铁股份有限公司 | Steel plate with low yield ratio, high toughness and excellent weldability and manufacturing method thereof |
| CN112143959B (en) * | 2019-06-27 | 2022-01-14 | 宝山钢铁股份有限公司 | Steel plate with low yield ratio, high toughness and excellent weldability and manufacturing method thereof |
| WO2021196365A1 (en) * | 2020-03-30 | 2021-10-07 | 南京钢铁股份有限公司 | High-ductility pipeline steel plate and manufacturing method therefor |
| CN112251687A (en) * | 2020-10-30 | 2021-01-22 | 江苏永钢集团有限公司 | High-performance fine-grained steel with uniform grains and preparation method thereof |
| CN112647019A (en) * | 2020-12-10 | 2021-04-13 | 安阳钢铁股份有限公司 | Manufacturing method of steel with different strength grades and low yield ratio |
| CN112647019B (en) * | 2020-12-10 | 2022-03-11 | 安阳钢铁股份有限公司 | Manufacturing method of steel with different strength grades and low yield ratio |
| CN114892081A (en) * | 2022-04-28 | 2022-08-12 | 湖南华菱湘潭钢铁有限公司 | Large-thickness 460 MPa-grade steel plate with excellent low-temperature toughness for ocean engineering and production method thereof |
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Application publication date: 20111214 |