WO2013061545A1 - 加工性に優れた高強度鋼板の製造方法 - Google Patents
加工性に優れた高強度鋼板の製造方法 Download PDFInfo
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
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- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Definitions
- the present invention relates to a method for producing a high-strength steel sheet having excellent workability suitable for use in automobile parts.
- Patent Document 1 high strength ductility is obtained by annealing a high Mn steel in a two-phase region.
- Patent Document 2 a high-Mn steel is made into a bainite-martensite structure after hot rolling, and fine retained austenite is formed by annealing and tempering. Further, a composite structure composed of tempered bainite and tempered martensite is used. The ductility is improved.
- Patent Document 1 no consideration is given to improvement in workability by Mn concentration, and there is room for improvement in workability.
- patent document 2 since it is a structure containing a large amount of bainite and martensite tempered at high temperature, it cannot be said that it has sufficient strength, and the amount of retained austenite is limited in order to improve local ductility. The total elongation is insufficient.
- the present invention advantageously solves the above-described problems of the prior art, and is suitable as a steel sheet used for automobile parts, and has a tensile strength (TS) of 980 MPa or more and total elongation (EL) of 25% or more. It aims at providing the manufacturing method of the high strength steel plate excellent in property.
- the present inventors have conducted extensive research from the viewpoint of the component composition and production method of the steel sheet, and as a result, have found the following. That is, after hot rolling on steel with Mn content of 3.5% or more and Si content of 0.5% or more, heat treatment is performed at an ultimate temperature of Ac 1 to Ac 1 + 100 ° C.
- the steel sheet is cold-rolled at a reduction rate of 20% or more, and the cold-rolled steel sheet is annealed for 1 minute or more at an ultimate temperature of Ac 1 -30 ° C to Ac 1 + 100 ° C.
- a method for producing high-strength steel sheets with excellent workability (2) By mass%, C: 0.03-0.35%, Si: 0.5-3.0%, Mn: 3.5-10.0%, P: 0.100% or less, S: 0.02% or less, the balance being Fe and inevitable impurities
- a method for producing a high-strength steel sheet with excellent workability (3) The method according to (1) or (2), wherein the steel slab further contains Al: 0.01 to 2.00% by mass. (4) The method according to (3), wherein the Al content is 0.10 to 2.00% by mass. (5) Further, the steel slab is selected by mass% from Cr: 0.005-2.00%, Mo: 0.005-2.00%, V: 0.005-2.00%, Ni: 0.005-2.00%, Cu: 0.005-2.00%. The method according to any one of (1) to (4), comprising at least one element. (6) The steel slab further includes at least one element selected from Ti: 0.005 to 0.20% and Nb: 0.005 to 0.20% by mass%, according to any one of (1) to (5) Method.
- the steel slab further includes at least one element selected from Ca: 0.001 to 0.005% and REM: 0.001 to 0.005% by mass%, according to any one of (1) to (7) Method.
- Component composition C 0.03-0.35%
- C is an element necessary for increasing TS by generating a low temperature transformation phase such as martensite and tempered martensite. Further, it is an element effective for stabilizing austenite to generate retained austenite and improving the workability of steel. If the amount of C is less than 0.03%, the production of retained austenite becomes insufficient and it is difficult to obtain high workability. On the other hand, if the C content exceeds 0.35%, spot weldability deteriorates. Therefore, the C content is 0.03 to 0.35%, preferably 0.07 to 0.25%.
- Si 0.5-3.0%
- Si is an element effective in improving the workability of steel by solid solution strengthening to improve TS and suppressing carbides to generate retained austenite.
- the Si amount needs to be 0.5% or more.
- Si exceeds 3.0%, brittleness becomes remarkable, and surface properties and weldability are deteriorated. Therefore, the Si content is 0.5 to 3.0%, preferably 0.8 to 2.3%.
- Mn 3.5-10.0%
- Mn is an element that improves TS by solid solution strengthening of steel and promotes the formation of low-temperature transformation phases such as martensite and tempered martensite. Further, it is an element effective for stabilizing austenite and generating retained austenite. In order to obtain such an effect, the Mn content needs to be 3.5% or more. On the other hand, if the amount of Mn exceeds 10.0%, ⁇ martensite is likely to be generated, and the workability is remarkably lowered. Therefore, the Mn content is 3.5 to 10.0%, preferably 3.8 to 8.0%.
- P 0.100% or less P is desirable to reduce the amount as much as possible because P deteriorates steel by grain boundary segregation and deteriorates weldability.
- the amount of P is preferably 0.100% or less from the viewpoint of manufacturing cost.
- S 0.02% or less S is present as inclusions such as MnS, and deteriorates weldability. Therefore, the amount is preferably reduced as much as possible. However, the amount of S is preferably 0.02% or less from the viewpoint of manufacturing cost.
- the balance consists of Fe and inevitable impurities.
- One or more of the following elements can be appropriately contained as required.
- Al 0.10 to 2.00%
- Al is an element effective in suppressing the formation of carbides and generating retained austenite. In order to obtain such an effect, it is preferable to add 0.10% or more. On the other hand, when the addition amount is 2.00% or less, it becomes easy to obtain a low temperature transformation phase without inhibiting the formation of austenite at the time of heating, so that high strength and high workability are easily obtained. Therefore, the Al content is desirably 0.10 to 2.00%. More preferably, it is 0.15 to 1.5%, and most preferably 0.20 to 1.0%. Further, the Al content is preferably 0.01% or more from the viewpoint of efficiently deoxidizing steel.
- Cr 0.005-2.00%, Mo: 0.005-2.00%, V: 0.005-2.00%, Ni: 0.005-2.00%, Cu: 0.005-2.00% At least one selected from Cr, Mo, V, Ni, Cu It is an element effective in increasing the strength by generating a low-temperature transformation phase such as martensite.
- the content of at least one element selected from Cr, Mo, V, Ni, and Cu is preferably 0.005% or more. Further, if the respective contents of Cr, Mo, V, Ni, and Cu are 2.00% or less, the effect can be exhibited without causing an increase in cost. Therefore, the contents of Cr, Mo, V, Ni and Cu are each preferably 0.005 to 2.00%.
- Ti and Nb are effective elements for forming carbonitride and increasing the strength of steel by precipitation strengthening.
- the content of Ti and Nb is preferably 0.005% or more.
- the Ti and Nb contents are 0.20% or less, the effect of increasing the strength can be obtained without lowering the EL. Accordingly, the Ti and Nb contents are each preferably 0.005 to 0.20%.
- B 0.0003 to 0.0050% B is effective in suppressing the formation of ferrite from the austenite grain boundaries and generating a low-temperature transformation phase to increase the strength of the steel.
- it is desirable to contain 0.0003% or more of B.
- the B content is preferably 0.0003 to 0.0050%.
- Both Ca and REM are effective elements for improving workability by controlling the form of sulfide.
- the content of at least one element selected from Ca and REM is preferably 0.001% or more.
- the respective contents of Ca and REM are 0.005% or less, the above characteristics can be improved without adversely affecting the cleanliness of the steel. Therefore, the Ca and REM contents are each preferably 0.001 to 0.005%.
- the high-strength steel sheet of the present invention is obtained by subjecting a slab having the above component composition to hot pickling, pickling, and then cold rolling at a rolling reduction of 20% or more, and then reaching the temperature. Heat treatment is held for 3 minutes or more at Ac 1 to Ac 1 + 100 ° C, or after hot rolling, heat treatment is held for 3 minutes or more at the ultimate temperature Ac 1 to Ac 1 + 100 ° C, followed by pickling Then, cold rolling is performed at a rolling reduction of 20% or more, and then annealing is performed by heating to an ultimate temperature of Ac 1 ⁇ 30 ° C. to Ac 1 + 100 ° C. and holding for 1 minute or longer.
- hot dip galvanizing treatment may be performed after the annealing treatment, or galvanizing alloying treatment may be further performed after the hot dip galvanizing treatment.
- Cold rolling reduction 20% or more Heat treatment condition: Achieving temperature Ac 1 to Ac 1 + 100 ° C. Hold for 3 minutes or more
- the cold rolling reduction is very important in the present invention.
- recrystallization of the ferrite occurs during the subsequent heat treatment or annealing, and a fine and ductile recrystallized ferrite is obtained, thereby improving the workability.
- austenite is finely divided by fine precipitation of ferrite, so that more stable retained austenite is obtained and workability is improved.
- the Ac1 transformation point was obtained from the following formula.
- Ac1 (°C) 751 + 500C + 35Si-28Mn-16Ni-100 (C ⁇ 0.15%)
- Ac1 (°C) 751 + 143C + 35Si-28Mn-16Ni-30 (C> 0.15%)
- the element symbol in a formula shows content (mass%) of each element in steel.
- the heat treatment may be performed before cold rolling, or may be performed after cold rolling and before annealing.
- the heat treatment performed before annealing is extremely important.
- Mn is concentrated in the austenite, and austenite can be generated quickly during annealing. Further, since Mn concentration in the austenite during annealing is promoted, more stable retained austenite is obtained, and workability is improved. If the temperature reached is less than Ac 1 , reverse transformation does not occur and Mn does not concentrate in austenite.
- the ultimate temperature exceeds Ac 1 + 100 ° C., the ferrite fraction decreases, so the amount of Mn concentration in the austenite decreases, austenite becomes unstable, and sufficient workability cannot be obtained. Accordingly, the ultimate temperature of the heat treatment is Ac 1 to Ac 1 + 100 ° C.
- the holding time at the ultimate temperature Ac 1 to Ac 1 + 100 ° C is less than 3 minutes, Mn does not diffuse sufficiently, the amount of Mn concentration in the austenite becomes small, and the austenite becomes unstable and sufficient workability Cannot be obtained. Therefore, the heat treatment is held for 3 minutes or longer. Preferably it is 30 minutes or more.
- Annealing conditions Achieving temperatures of Ac 1 -30 ° C to Ac 1 + 100 ° C for 1 minute or longer A cold-rolled material with Mn-concentrated parts is obtained by the heat treatment before annealing, but below Ac 1 -30 ° C The reverse transformation (transformation from ferrite to austenite) does not occur sufficiently, and good workability cannot be obtained. On the other hand, if the ultimate temperature exceeds Ac 1 + 100 ° C., the amount of austenite produced by reverse transformation increases, so that the amount of martensite produced after annealing increases excessively and good workability cannot be obtained. Therefore, the ultimate temperature during annealing is set to Ac 1 -30 ° C to Ac 1 + 100 ° C.
- the holding time is less than 1 minute, austenite is not sufficiently generated by reverse transformation, and good workability cannot be obtained. Accordingly, the holding time is 1 minute or longer.
- Hot dip galvanizing is performed by immersing the steel plate (steel plate after annealing) obtained in the above in a hot dip galvanizing bath at 440 ° C or higher and 500 ° C or lower, and then adjusting the coating amount by gas wiping or the like. Is preferred.
- a galvanizing bath having an Al content of 0.08 to 0.18 mass%.
- the alloying treatment of galvanizing it is preferable to perform the alloying by holding in the temperature range of 460 ° C. to 580 ° C. for 1 second to 40 seconds.
- Cold-rolled steel sheets, hot-dip galvanized steel sheets, and alloyed hot-dip galvanized steel sheets can be subjected to temper rolling for the purposes of shape correction and surface roughness adjustment.
- various coating processes such as resin and oil-fat coating, can also be given.
- the slab is preferably produced by a continuous casting method in order to prevent macro segregation, but can also be produced by an ingot-making method or a thin slab casting method.
- To hot-roll the slab the slab may be cooled to room temperature and then re-heated for hot rolling, or the slab may be charged in a heating furnace without being cooled to room temperature. Can also be done. Alternatively, an energy saving process in which hot rolling is performed immediately after performing a slight heat retention can also be applied.
- it is preferable to heat to 1100 ° C. or higher in order to dissolve carbides and prevent an increase in rolling load.
- the heating temperature of the slab is preferably 1300 ° C. or lower.
- the rough bar after rough rolling can be heated from the viewpoint of preventing troubles during rolling even if the heating temperature of the slab is lowered.
- a continuous rolling process which joins rough bars and performs finish rolling continuously can be applied.
- finish rolling may increase anisotropy and reduce workability after cold rolling / annealing, it is preferably performed at a finishing temperature equal to or higher than the Ar 3 transformation point.
- the winding condition is preferably 350 ° C. or higher from the viewpoint of steel plate shape stability.
- the winding temperature is preferably 650 ° C. or less.
- the steel sheet after winding is subjected to heat treatment, cold rolling, annealing, and hot dip galvanizing under the above conditions after removing the scale by pickling or the like.
- Some steel slabs were hot-rolled and pickled, then cold-rolled under the conditions shown in Tables 2 and 3, then subjected to heat treatment under the conditions shown in Tables 2 and 3 and then subjected to annealing.
- Annealing was performed in a laboratory simulating a box annealing furnace, a continuous annealing line, and a continuous hot dip galvanizing line, and cold-rolled steel sheets, hot-dip galvanized steel sheets, and galvannealed steel sheets were produced.
- hot-dip galvanized steel sheets are immersed in a hot-dip galvanizing bath at 460 ° C after annealing to form zinc plating (double-sided plating) with a coating weight of 35 to 45 g / m 2 per side, and then average cooling Prepared by cooling at a rate of 10 ° C / sec. Alloyed hot-dip galvanized steel sheet is prepared by alloying for 30 seconds at 560 ° C after galvanization and cooling at an average cooling rate of 10 ° C / sec. did.
- JIS No. 5 tensile test specimens were collected so that the direction perpendicular to the rolling direction was the tensile direction, and the strain rate was 10 ⁇ 3 / s. A tensile test was performed. The results are shown in Tables 2 and 3.
- TS was 980 MPa or more
- EL was 25% or more
- at least one of TS and EL is inferior.
- the present invention it is possible to obtain a high-strength steel sheet excellent in workability, which has a tensile strength (TS) of 980 MPa or more and a total elongation (EL) of 25% or more.
- TS tensile strength
- EL total elongation
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Abstract
Description
(1)質量%で、C:0.03~0.35%、Si:0.5~3.0%、Mn:3.5~10.0%、P:0.100%以下、S:0.02%以下を含み、残部がFeおよび不可避的不純物からなる成分組成を有する鋼スラブを準備し、該鋼スラブを熱間圧延し、該熱延した鋼板にAc1~Ac1+100℃の到達温度で3分以上保持する熱処理を施し、該熱処理を施した鋼板を20%以上の圧下率で冷間圧延し、該冷延した鋼板にAc1-30℃~Ac1+100℃の到達温度で1分以上保持する焼鈍を施すことを特徴とする加工性に優れた高強度鋼板の製造方法。
(2)質量%で、C:0.03~0.35%、Si:0.5~3.0%、Mn:3.5~10.0%、P:0.100%以下、S:0.02%以下を含み、残部がFeおよび不可避的不純物からなる成分組成を有する鋼スラブを準備し、該鋼スラブを熱間圧延し、該熱延した鋼板を20%以上の圧下率で冷間圧延し、該冷間圧延を施した鋼板にAc1~Ac1+100℃の到達温度で3分以上保持する熱処理を施し、該熱処理した鋼板にAc1-30℃~Ac1+100℃の到達温度で1分以上保持する焼鈍を施すことを特徴とする加工性に優れた高強度鋼板の製造方法。
(3)さらに前記鋼スラブが、質量%で、Al:0.01~2.00%を含有する(1)または(2)に記載の方法。
(4)前記Al含有量が、質量%で、0.10~2.00%である(3)に記載の方法。
(5)さらに前記鋼スラブが、質量%で、Cr:0.005~2.00%、Mo:0.005~2.00%、V:0.005~2.00%、Ni:0.005~2.00%、Cu:0.005~2.00%から選ばれる少なくとも1種の元素を含有する(1)~(4)のいずれかに記載の方法。
(6)さらに前記鋼スラブが、質量%で、Ti:0.005~0.20%、Nb:0.005~0.20%から選ばれる少なくとも1種の元素を含有する(1)~(5)のいずれかに記載の方法。
(7)さらに前記鋼スラブが、質量%で、B:0.0003~0.0050%を含有する(1)~(6)のいずれかに記載の方法。
(8)さらに前記鋼スラブが、質量%で、Ca:0.001~0.005%、REM:0.001~0.005%から選ばれる少なくとも1種の元素を含有する(1)~(7)のいずれかに記載の方法。
(9)前記焼鈍を施した鋼板に溶融亜鉛めっきを施す(1)~(8)のいずれかに記載の方法。
(10)前記焼鈍を施した鋼板に溶融亜鉛めっきを施し、さらに亜鉛めっきを合金化処理する(1)~(8)のいずれかに記載の方法。
(11)前記加工性に優れた高強度鋼板がTS:980MPa以上、EL:25%以上を有する加工性に優れた高強度鋼板である(1)~(10)のいずれかに記載の方法。
(12)前記C含有量が、質量%で、0.07~0.25%である(1)~(11)のいずれかに記載の方法。
(13)前記Si含有量が、質量%で、0.8~2.3%である(1)~(12)のいずれかに記載の方法。
(14)前記Mn含有量が、質量%で、3.8~8.0%である(1)~(13)のいずれかに記載の方法。
(15)前記Al含有量が、質量%で、0.15~1.5%である(1)~(14)のいずれかに記載の方法。
(16)前記Al含有量が、質量%で、0.20~1.0%である(15)に記載の方法。
(17)前記熱処理がAc1~Ac1+100℃の到達温度で30分以上保持する熱処理である(1)~(16)のいずれかに記載の方法。
C:0.03~0.35%
Cは、マルテンサイトや焼戻しマルテンサイトなどの低温変態相を生成させてTSを上昇させるために必要な元素である。また、オーステナイトを安定させて残留オーステナイトを生成させ、鋼の加工性を向上させるのに有効な元素である。C量が0.03%未満では、残留オーステナイトの生成が不十分になり高加工性を得ることが難しい。一方、C量が0.35%を超えると、スポット溶接性が劣化する。したがって、C量は0.03~0.35%、好ましくは0.07~0.25%とする。
Siは、鋼を固溶強化してTSを向上させたり、炭化物を抑制して残留オーステナイトを生成させ鋼の加工性を向上させるのに有効な元素である。こうした効果を得るにはSi量を0.5%以上とする必要がある。一方、Siが3.0%を超えると、脆性が顕著になり、また表面性状や溶接性の劣化を招く。したがって、Si量は0.5~3.0%、好ましくは0.8~2.3%とする。
Mnは、鋼を固溶強化してTSを向上させたり、マルテンサイトや焼戻しマルテンサイトなどの低温変態相の生成を促進する元素である。また、オーステナイトを安定させて残留オーステナイトを生成させるのに有効な元素である。こうした効果を得るには、Mn量を3.5%以上にする必要がある。一方、Mn量が10.0%を超えると、εマルテンサイトが生成されやすくなり、加工性が著しく低下する。したがって、Mn量は3.5~10.0%、好ましくは3.8~8.0%とする。
Pは、粒界偏析により鋼を劣化させ、溶接性を劣化させるため、その量は極力低減することが望ましい。しかし、製造コストの面などからP量は0.100%以下であることが好ましい。
Sは、MnSなどの介在物として存在して、溶接性を劣化させるため、その量は極力低減することが好ましい。しかし、製造コストの面からS量は0.02%以下であることが好ましい。
Alは、炭化物の生成を抑制し、残留オーステナイトを生成させるのに有効な元素である。こうした効果を得るには0.10%以上添加することが好ましい。また、その添加量が2.00%以下では、加熱時のオーステナイトの形成を阻害せず、低温変態相を得ることが容易となるため、高強度高加工性が得られ易くなる。したがって、Al量は0.10~2.00%であることが望ましい。より好ましくは0.15~1.5%、最も好ましくは0.20~1.0%である。また、Al量は、鋼の脱酸を効率よく行う観点からは、0.01%以上含有させることが好ましい。
Cr、Mo、V、Ni、Cuはマルテンサイトなどの低温変態相を生成させ高強度化に有効な元素である。こうした効果を得るには、Cr、Mo、V、Ni、Cuから選ばれる少なくとも1種の元素の含有量を0.005%以上とすることが好ましい。また、Cr、Mo、V、Ni、Cu のそれぞれの含有量が2.00%以下であれば、コストアップを招くことなく、その効果を発現させることができる。したがって、Cr、Mo、V、Ni、Cuの含有量はそれぞれ0.005~2.00%とすることが好ましい。
Ti、Nbは、炭窒化物を形成し、鋼を析出強化により高強度化するのに有効な元素である。こうした効果を得るにはTi、Nbの含有量を0.005%以上とすることが好ましい。また、Ti、Nbの含有量が0.20%以下であれば、ELが低下することなく高強度化の効果を得ることができる。したがって、Ti、Nbの含有量はそれぞれ0.005~0.20%とすることが好ましい。
Bはオーステナイト粒界からのフェライト生成を抑制し低温変態相を生成させて鋼の強度を上昇させるのに有効である。こうした効果を得るには0.0003%以上のBを含有することが望ましい。また、0.0050%以下であれば、コストアップを招くことなく、その効果を発現させることができる。したがって、Bの含有量は0.0003~0.0050%とすることが好ましい。
Ca、REMは、いずれも硫化物の形態制御により加工性を改善させるのに有効な元素である。こうした効果を得るには、Ca、REMから選ばれる少なくとも1種の元素の含有量を0.001%以上とすることが好ましい。。また、Ca、REMのそれぞれの含有量が0.005%以下であれば、鋼の清浄度に悪影響を及ぼすことなく上記特性を改善することができる。したがって、Ca、REMの含有量はそれぞれ0.001~0.005%とすることが好ましい。
本発明の高強度鋼板は、上記の成分組成を有するスラブに、熱間圧延後、酸洗を施し、次いで、20%以上の圧下率で冷間圧延を施した後、到達温度Ac1~Ac1+100℃で3分以上保持する熱処理を施し、または、熱間圧延後、到達温度Ac1~Ac1+100℃で3分以上保持する熱処理を施した後、酸洗し、次いで20%以上の圧下率で冷間圧延を施し、その後、到達温度Ac1-30℃~Ac1+100℃まで加熱し1分以上保持する焼鈍を行って製造する。
熱処理条件:到達温度Ac1~Ac1+100℃で3分以上保持
本発明においては冷間圧延の圧下率は極めて重要である。20%以上の圧下率で冷間圧延を行うことで、その後の熱処理あるいは焼鈍の際にフェライトの再結晶が起こり、微細で延性に富んだ再結晶フェライトが得られ、加工性が向上する。また、フェライトの微細析出によりオーステナイトが微細に分断されて、より安定した残留オーステナイトが得られ加工性が向上する。なお、Ac1変態点は以下の式より求めた。
Ac1(℃)= 751+500C+35Si-28Mn-16Ni-100 (C≦0.15%)
Ac1(℃)= 751+143C+35Si-28Mn-16Ni-30 (C>0.15%)
式中の元素記号は、鋼中の各元素の含有量(質量%)を示す。
前記焼鈍前の熱処理によってMn濃化部を有する冷延材が得られているが、Ac1-30℃未満では逆変態(フェライトからオーステナイトへの変態)が十分起こらず、良好な加工性が得られない。一方、到達温度がAc1+100℃を超えると、逆変態によるオーステナイトの生成量が増加することで焼鈍後に生成するマルテンサイトの量が過度に増加し良好な加工性が得られない。したがって、焼鈍時の到達温度はAc1-30℃~Ac1+100℃とする。
Claims (17)
- 質量%で、C:0.03~0.35%、Si:0.5~3.0%、Mn:3.5~10.0%、P:0.100%以下、S:0.02%以下を含み、残部がFeおよび不可避的不純物からなる成分組成を有する鋼スラブを準備し、
該鋼スラブを熱間圧延し、
該熱延した鋼板にAc1~Ac1+100℃の到達温度で3分以上保持する熱処理を施し、
該熱処理を施した鋼板を20%以上の圧下率で冷間圧延し、
該冷延した鋼板にAc1-30℃~Ac1+100℃の到達温度で1分以上保持する焼鈍を施すことを特徴とする加工性に優れた高強度鋼板の製造方法。 - 質量%で、C:0.03~0.35%、Si:0.5~3.0%、Mn:3.5~10.0%、P:0.100%以下、S:0.02%以下を含み、残部がFeおよび不可避的不純物からなる成分組成を有する鋼スラブを準備し、
該鋼スラブを熱間圧延し、
該熱延した鋼板を20%以上の圧下率で冷間圧延し、
該冷間圧延を施した鋼板にAc1~Ac1+100℃の到達温度で3分以上保持する熱処理を施し、
該熱処理した鋼板にAc1-30℃~Ac1+100℃の到達温度で1分以上保持する焼鈍を施すことを特徴とする加工性に優れた高強度鋼板の製造方法。 - さらに前記鋼スラブが、質量%で、Al:0.01~2.00%を含有する請求項1または2に記載の方法。
- 前記Al含有量が、質量%で、0.10~2.00%である請求項3に記載の方法。
- さらに前記鋼スラブが、質量%で、Cr:0.005~2.00%、Mo:0.005~2.00%、V:0.005~2.00%、Ni:0.005~2.00%、Cu:0.005~2.00%から選ばれる少なくとも1種の元素を含有する請求項1~4のいずれかに記載の方法。
- さらに前記鋼スラブが、質量%で、Ti:0.005~0.20%、Nb:0.005~0.20%から選ばれる少なくとも1種の元素を含有する請求項1~5のいずれかに記載の方法。
- さらに前記鋼スラブが、質量%で、B:0.0003~0.0050%を含有する請求項1~6のいずれかに記載の方法。
- さらに前記鋼スラブが、質量%で、Ca:0.001~0.005%、REM:0.001~0.005%から選ばれる少なくとも1種の元素を含有する請求項1~7のいずれかに記載の方法。
- 前記焼鈍を施した鋼板に溶融亜鉛めっきを施す請求項1~8のいずれかに記載の方法。
- 前記焼鈍を施した鋼板に溶融亜鉛めっきを施し、さらに亜鉛めっきを合金化処理する請求項1~8のいずれかに記載の方法。
- 前記加工性に優れた高強度鋼板がTS:980MPa以上、EL:25%以上を有する加工性に優れた高強度鋼板である請求項1~10のいずれかに記載の方法。
- 前記C含有量が、質量%で、0.07~0.25%である請求項1~11のいずれかに記載の方法。
- 前記Si含有量が、質量%で、0.8~2.3%である請求項1~12のいずれかに記載の方法。
- 前記Mn含有量が、質量%で、3.8~8.0%である請求項1~13のいずれかに記載の方法。
- 前記Al含有量が、質量%で、0.15~1.5%である請求項1~14のいずれかに記載の方法。
- 前記Al含有量が、質量%で、0.20~1.0%である請求項15に記載の方法。
- 前記熱処理がAc1~Ac1+100℃の到達温度で30分以上保持する熱処理である請求項1~16のいずれかに記載の方法。
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KR101821913B1 (ko) | 2014-01-06 | 2018-03-08 | 신닛테츠스미킨 카부시키카이샤 | 강재 및 그 제조 방법 |
US10266911B2 (en) | 2014-01-06 | 2019-04-23 | Nippon Steel & Sumitomo Metal Corporation | Hot-formed member and manufacturing method of same |
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US10844455B2 (en) | 2014-07-03 | 2020-11-24 | Arcelormittal | Method for manufacturing a high strength steel sheet and sheet obtained by the method |
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JP2017179432A (ja) * | 2016-03-29 | 2017-10-05 | Jfeスチール株式会社 | ホットプレス部材およびその製造方法 |
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JP6213696B1 (ja) * | 2016-12-05 | 2017-10-18 | 新日鐵住金株式会社 | 高強度鋼板 |
JP2021502480A (ja) * | 2017-11-08 | 2021-01-28 | ポスコPosco | 冷間成形性に優れた超高強度高延性鋼板及びその製造方法 |
JP7022825B2 (ja) | 2017-11-08 | 2022-02-18 | ポスコ | 冷間成形性に優れた超高強度高延性鋼板及びその製造方法 |
JP2020041212A (ja) * | 2017-11-28 | 2020-03-19 | Jfeスチール株式会社 | 高強度鋼帯の製造方法 |
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JPWO2019194250A1 (ja) * | 2018-04-03 | 2020-04-30 | 日本製鉄株式会社 | 鋼板及び鋼板の製造方法 |
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EP2772556B1 (en) | 2018-12-19 |
JPWO2013061545A1 (ja) | 2015-04-02 |
US20140360632A1 (en) | 2014-12-11 |
JP5532188B2 (ja) | 2014-06-25 |
EP2772556A4 (en) | 2015-04-01 |
TW201317369A (zh) | 2013-05-01 |
US9617614B2 (en) | 2017-04-11 |
EP2772556A1 (en) | 2014-09-03 |
KR101613806B1 (ko) | 2016-04-29 |
CN103890202A (zh) | 2014-06-25 |
KR20140075789A (ko) | 2014-06-19 |
CN103890202B (zh) | 2015-09-30 |
TWI472627B (zh) | 2015-02-11 |
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