WO2022206916A1 - 屈服强度≥450MPa的热镀铝锌或热镀锌铝镁复相钢及其快速热处理热镀制造方法 - Google Patents
屈服强度≥450MPa的热镀铝锌或热镀锌铝镁复相钢及其快速热处理热镀制造方法 Download PDFInfo
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- WO2022206916A1 WO2022206916A1 PCT/CN2022/084541 CN2022084541W WO2022206916A1 WO 2022206916 A1 WO2022206916 A1 WO 2022206916A1 CN 2022084541 W CN2022084541 W CN 2022084541W WO 2022206916 A1 WO2022206916 A1 WO 2022206916A1
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- Prior art keywords
- hot
- heating
- aluminum
- dip galvanized
- dip
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
- C23C2/29—Cooling or quenching
Abstract
Description
试验钢 | C | Si | Mn | P | S | Nb | Ti | Cr | N |
A | 0.07 | 0.15 | 1.4 | 0.010 | 0.007 | / | 0.035 | 0.40 | 0.0005 |
B | 0.08 | 0.18 | 1.6 | 0.012 | 0.008 | 0.018 | 0.015 | 0.30 | 0.002 |
C | 0.10 | 0.20 | 1.2 | 0.014 | 0.005 | 0.020 | 0.010 | 0.25 | 0.003 |
D | 0.09 | 0.30 | 1.0 | 0.008 | 0.006 | 0.025 | 0.020 | 0.15 | 0.004 |
E | 0.06 | 0.08 | 1.5 | 0.009 | 0.004 | 0.030 | 0.030 | 0.05 | 0.0025 |
F | 0.10 | 0.15 | 1.1 | 0.011 | 0.003 | 0.035 | / | 0.38 | 0.001 |
钢号 | C | Si | Mn | P | S | Nb | Ti | Cr | N |
A | 0.090 | 0.15 | 1.8 | 0.010 | 0.012 | / | 0.045 | 0.30 | 0.003 |
B | 0.075 | 0.18 | 1.6 | 0.015 | 0.010 | 0.035 | 0.020 | 0.35 | 0.001 |
C | 0.120 | 0.30 | 1.5 | 0.009 | 0.006 | 0.025 | 0.030 | 0.25 | 0.009 |
D | 0.105 | 0.05 | 1.2 | 0.008 | 0.005 | 0.030 | 0.025 | 0.50 | 0.008 |
E | 0.088 | 0.08 | 1.3 | 0.012 | 0.008 | 0.033 | 0.035 | 0.40 | 0.002 |
F | 0.100 | 0.20 | 1.4 | 0.013 | 0.009 | 0.045 | / | 0.35 | 0.005 |
Claims (18)
- 屈服强度≥450MPa的热镀铝锌或热镀锌铝镁复相钢,其成分重量百分比为:C:0.06~0.12%,Si:0.05~0.30%,Mn:1.0~1.8%,P≤0.015%,S≤0.015%、如≤0.012%,N≤0.04%,Cr≤0.50%、如0.25~0.50%或≤0.40%,还含有Ti或Nb中的一种或两种,Nb:0~0.045%、如0~0.035%,Ti:0~0.045%、如0~0.035%,其余为Fe和其他不可避免的杂质;且需同时满足:0.25≤(C+Mn/6)≤0.40;Mn/S≥150;不含Ti时,Nb满足0.01%≤(Nb-0.22C-1.1N)≤0.03%;不含Nb时,Ti满足0.3≤Ti/C≤0.6;含有Ti和Nb时,0.03%≤(Ti+Nb)≤0.07%;优选地,所述屈服强度≥450MPa的热镀铝锌或热镀锌铝镁复相钢通过下述工艺获得:1)冶炼、铸造按上述所述的化学成分冶炼并铸造成板坯;2)热轧、冷却热轧出炉温度1150~1250℃,热轧终轧温度830~890℃,卷取温度520~680℃,轧后采用层流冷却,层流前段快速冷却速度为80~120℃/s;3)酸洗、冷轧冷却后酸洗,将带钢表面氧化铁皮清洗干净,冷轧累计压下率为60~80%;4)连续退火、热镀铝锌或热镀锌铝镁在无氧化连续退火镀铝锌或镀锌铝镁炉内进行连续退火,退火处理依次包括加热段、均热段、镀前冷却段;其中,加热段采用一段式或两段式加热;采用一段式快速加热时,加热速率为30~300℃/s;采用两段式快速加热时,第一段以10~300℃/s的加热速率从室温加热至550~625℃,第二段以30~300℃/s的加热速率从550~625℃加热至750~850℃;之后进行均热;均热温度750~840℃,均热时间1~20s;随后以30~150℃/s冷却速度快速冷却至550~600℃,进行热镀铝锌或热镀锌铝镁;热镀铝锌之后以30~200℃/s的冷却速率冷却至室温,获得热镀铝锌AZ产品;或者,热镀锌铝镁之后以30~180℃/s的冷却速率冷却至室温,获得热镀锌铝镁AM产品;5)光整、拉矫平整率为0.25%+0.2,拉矫率为0.2%±0.2。
- 如权利要求1所述的屈服强度≥450MPa的热镀铝锌或热镀锌铝镁复相钢,其特征在于,所述C的含量为0.06~0.10%、优选0.06~0.08%,或为0.075~0.12%、优选0.08~0.10%;和/或所述Si含量为0.15~0.30%;和/或所述Mn的含量为1.0~1.6%、优选1.0~1.3%,或为1.2~1.8%、优选1.2~1.6%;和/或所述Si≤0.012%;和/或所述Cr的含量为≤0.40%,或者为0.25~0.5%;和/或所述Nb的含量为0~0.035%;和/或所述Ti的含量为0~0.035%。
- 如权利要求1或2所述的屈服强度≥450MPa的热镀铝锌或热镀锌铝镁复相钢,其特征在于,0.25≤(C+Mn/6)≤0.35或0.30≤(C+Mn/6)≤0.40,和/或,不含Nb时,Ti满足0.3≤Ti/C≤0.5,或满足0.4≤Ti/C≤0.6,和/或,同时含有Ti和Nb时,0.03%≤(Ti+Nb)≤0.06%,或0.05%≤(Ti+Nb)≤0.07%。
- 如权利要求1-3中任一项所述的屈服强度≥450MPa的热镀铝锌或热镀锌铝镁复相钢,其特征在于,所述热镀铝锌或热镀锌铝镁复相钢的显微组织为包括铁素体、马氏体、贝氏体、微米级析出碳化物、带状晶粒中至少三种组织的复相组织;和/或所述热镀铝锌或热镀锌铝镁复相钢的屈服强度≥450MPa,抗拉强度≥500MPa,伸长率≥14%;和/或所述热镀铝锌或热镀锌铝镁复相钢的表面为均匀的银白色锌花,锌花大小在0.1~6.0mm范围。
- 如权利要求1-4中任一项所述的屈服强度≥450MPa的热镀铝锌或热镀锌铝镁复相钢,其特征在于,所述连续退火、热镀铝锌或热镀锌铝镁全过程用时22~80.5s,如22~80s或23~66s。
- 如权利要求1-5中任一项所述的屈服强度≥450MPa的热镀铝锌或热镀锌铝镁复相钢,其特征在于,所述步骤2)中,所述热轧出炉温度为1180~1220℃;和/或所述步骤2)中,所述热轧终轧温度为850~880℃,如850~870℃或860~880℃;和/或所述步骤2)中,所述卷取温度为550~620℃或570~620℃;和/或所述步骤2)中,所述层流前段快速冷却速度为100~120℃/s;和/或所述步骤3)中,所述冷轧累计压下率为60~70%;和/或所述步骤4)中,所述快速加热采用一段式加热时加热速率为50~300℃/s;和/或所述步骤4)中,所述快速加热采用两段式加热时,第一段以30~300℃/s的加热速率从室温加热至550~620℃或550~625℃,第二段以50~300℃/s的加热速率从550~620℃或550~625℃加热至760~840℃或770~850℃。
- 如权利要求1所述的屈服强度≥450MPa的热镀铝锌或热镀锌铝镁复相钢,其特征在于,所述热镀铝锌或热镀锌铝镁复相钢的成分重量百分比为:C:0.06~0.10%,Si:0.05~0.30%,Mn:1.0~1.6%,P≤0.015%,S≤0.015%,N≤0.04%、如≤0.005%或为0.0005~~0.005%,Cr≤0.40%、如0.05~0.40%,还含有Ti或Nb中的一种或两种,Nb:0~0.035%,Ti:0~0.035%,其余为Fe和其他不可避免的杂质;且需同时满足:0.25≤(C+Mn/6)≤0.35;Mn/S≥150;不含Ti时,Nb满足0.01%≤(Nb-0.22C-1.1N)≤0.03%;不含Nb时,Ti满足0.3≤Ti/C≤0.5;含有Ti和Nb时,0.03%≤(Ti+Nb)≤0.06%;优选地,所述热镀铝锌或热镀锌铝镁复相钢中,C含量为0.06~0.08%;优选地,Si含量为0.15~0.30%;优选地,Mn含量为1.0~1.3%;优选地,所述热镀铝锌或热镀锌铝镁复相钢的屈服强度≥450MPa,抗拉强度≥500MPa,伸长率≥20%;优选地,此热镀铝锌或热镀锌铝镁复相钢的屈服强度为450~515MPa、如450~540MPa,抗拉强度为510~590MPa、如510~580MPa,延伸率20~26.5%,如21~26%。
- 如权利要求7所述的屈服强度≥450MPa的热镀铝锌或热镀锌铝镁复相钢,其特征在于,所述热镀铝锌或热镀锌铝镁复相钢通过下述工艺获得:a)冶炼、铸造按上述所述的化学成分冶炼并铸造成板坯;b)热轧、冷却热轧出炉温度1150~1250℃,热轧终轧温度830~890℃,卷取温度520~650℃,轧后采用层流冷却,层流前段快速冷却速度为80~120℃/s;c)酸洗、冷轧冷却后酸洗,将带钢表面氧化铁皮清洗干净,冷轧累计压下率为60~80%;d)连续退火、热镀铝锌或热镀锌铝镁在无氧化连续退火镀铝锌或镀锌铝镁炉内进行连续退火,退火处理依次包括加热段、均热段、镀前冷却段;其中,加热段采用一段式或两段式加热;采用一段式快速加热时,加热速率为30~300℃/s;采用两段式快速加热时,第一段以10~300℃/s的加热速率从室温加热至550~625℃,第二段以30~300℃/s的加热速率从550~625℃加热至750~840℃;之后进行均热;均热温度750~840℃,均热时间1~20s;随后以30~150℃/s冷却速度冷却至550~600℃,进行热镀铝锌或热镀锌铝镁;热镀铝锌之后以30~200℃/s冷却速率冷却至室温,获得热镀铝锌AZ产品;或者,热镀锌铝镁之后以30~180℃/s冷却速率冷却至室温,获得热镀锌铝镁AM产品;e)光整、拉矫平整率为0.25%+0.2,拉矫率为0.2%±0.2。
- 如权利要求8所述的屈服强度≥450MPa的热镀铝锌或热镀锌铝镁复相钢,其特征在于,步骤d)所述的连续退火、热镀铝锌或热镀锌铝镁全过程用时23~66.5s,如23~66s;和/或步骤b)中,所述热轧出炉温度为1180~1220℃;和/或步骤b)中,所述热轧终轧温度为850~870℃;和/或步骤b)中,所述卷取温度为550~620℃;和/或步骤b)中,所述层流前段快速冷却速度为100~120℃/s;和/或步骤c)中,所述冷轧累计压下率为60~70%;和/或步骤d)中,所述快速加热采用一段式加热时加热速率为50~300℃/s;和/或步骤d)中,所述快速加热采用两段式加热时,第一段以30~300℃/s的加热速率从室温加热至550~625℃,第二段以50~300℃/s的加热速率从550~625℃加热至760~840℃。
- 如权利要求1所述的屈服强度≥450MPa的热镀铝锌或热镀锌铝镁复相钢,其特征在于,所述热镀铝锌或热镀锌铝镁复相钢的成分重量百分比为:C:0.075~0.12%,Si:0.05~0.30%,Mn:1.2~1.8%,P≤0.015%,S≤0.012%,N≤0.04%、如≤0.01%或为0.001~0.01%,Cr:0.25~0.50%,还含有Ti或Nb中的一种或两种,Nb:0~0.045%,Ti:0~0.045%,其余为Fe和其他不可避免的杂质;且需同时满足:0.30≤(C+Mn/6)≤0.40;Mn/S>150;不 含Ti时,Nb满足0.01%≤(Nb-0.22C-1.1N)≤0.03%;不含Nb时,Ti满足0.4≤Ti/C≤0.6;含有Ti和Nb时,0.05%≤(Ti+Nb)≤0.07%;优选地,所述热镀铝锌或热镀锌铝镁复相钢的屈服强度≥550MPa;优选地,所述热镀铝锌或热镀锌铝镁复相钢中,C含量为0.08~0.10%;优选地,Si含量为0.15~0.30%;优选地,Mn含量为1.2~1.6%;优选地,所述热镀铝锌或热镀锌铝镁复相钢的屈服强度≥550MPa,抗拉强度≥600MPa,伸长率≥14%,优选地,此热镀铝锌或热镀锌铝镁复相钢的屈服强度为550~625MPa、如550~615MPa,抗拉强度为615~700MPa,延伸率14~17.5%、如14~17%。
- 如权利要求10所述的屈服强度≥450MPa的热镀铝锌或热镀锌铝镁复相钢,其特征在于,所述热镀铝锌或热镀锌铝镁复相钢通过下述工艺获得:A)冶炼、铸造按上述所述的化学成分冶炼并铸造成板坯;B)热轧、冷却热轧出炉温度1170~1250℃,热轧终轧温度845~890℃(如850~890℃),卷取温度550~680℃,轧后采用层流冷却,层流前段快速冷却速度为80~120℃/s;C)酸洗、冷轧冷却后酸洗,将带钢表面氧化铁皮清洗干净,冷轧累计压下率为60~80%;D)连续退火、热镀铝锌或热镀锌铝镁在无氧化连续退火镀铝锌或锌铝镁炉内进行连续退火,退火处理依次包括加热段、均热段、镀前冷却段,其中,加热段采用一段式或两段式加热;采用一段式快速加热时,加热速率为30~300℃/s;采用两段式快速加热时,第一段以10~300℃/s的加热速率从室温加热至550~620℃,第二段以30~300℃/s的加热速率从550~620℃加热至770~850℃;之后进行均热;均热温度770~850℃,均热时间1~20s;随后以30~150℃/s冷却速度快速冷却至550~600℃,进行热镀铝锌或热镀锌铝镁;热镀铝锌之后以30~200℃/s的冷却速率冷却至室温,获得热镀铝锌AZ产品;或者,热镀锌铝镁之后以30~180℃/s的冷却速率冷却至室温,获得热镀锌铝镁AM产品;5)光整、拉矫平整率为0.25%+0.2,拉矫率为0.2%±0.2。
- 如权利要求11所述的屈服强度≥450MPa的热镀铝锌或热镀锌铝镁复相钢,其特 征在于,步骤D)所述的连续退火、热镀铝锌或热镀锌铝镁全过程用时22~80.5s,如22~80s;和/或步骤B)中,所述热轧出炉温度为1180~1220℃;和/或步骤B)中,所述热轧终轧温度为860~880℃;和/或步骤B)中,所述卷取温度为570~620℃;和/或步骤B)中,所述层流前段快速冷却速度为100~120℃/s;和/或步骤C)中,所述冷轧累计压下率为60~70%;和/或步骤D)中,所述快速加热采用一段式加热时加热速率为50~300℃/s;和/或步骤D)中,所述快速加热采用两段式加热时,第一段以30~300℃/s的加热速率从室温加热至550~620℃,第二段以50~300℃/s的加热速率从550~620℃加热至770~850℃。
- 权利要求1所述的屈服强度≥450MPa的热镀铝锌或热镀锌铝镁复相钢的快速热处理热镀制造方法,包括如下步骤:1)冶炼、铸造按上述化学成分冶炼并铸造成铸坯;2)热轧、冷却热轧出炉温度1150~1250℃,热轧终轧温度830~890℃,卷取温度520~680℃,轧后采用层流冷却,层流前段快速冷却速度为80~120℃/s;3)酸洗、冷轧冷却后酸洗,将带钢表面氧化铁皮清洗干净,冷轧累计压下率为60~80%;4)连续退火、热镀铝锌或热镀锌铝镁a.连续退火在无氧化连续退火镀铝锌或锌铝镁炉内进行连续退火,退火处理依次包括加热段、均热段、镀前冷却段,其中,加热段采用一段式或两段式加热;采用一段式快速加热时,加热速率为30~300℃/s;采用两段式快速加热时,第一段以10~300℃/s的加热速率从室温加热至550~625℃,第二段以30~300℃/s的加热速率从550~625℃加热至750~850℃;之后进行均热;均热温度750~850℃,均热时间1~20s;随后以30~150℃/s冷却速度快速冷却至550~600℃;b.热镀铝锌或热镀锌铝镁退火后进行热镀铝锌,热镀铝锌温度550~600℃;之后由550~600℃快速冷却至室温,获得热镀铝锌AZ产品,冷却速率为30~200℃/s;或者,退火后进行热镀锌铝镁,热镀锌铝镁温度550~600℃;之后由550~600℃快速冷却至室温,获得热镀锌铝镁AM产品,冷却速率为30~180℃/s;5)光整、拉矫平整率为0.25%+0.2,拉矫率为0.2%±0.2。
- 如权利要求13所述的方法,其特征在于,所述连续退火、热镀铝锌或热镀锌铝镁全过程用时22~80s,如23~66s;和/或步骤2)中,所述热轧出炉温度为1180~1220℃;和/或步骤2)中,所述热轧终轧温度850~870℃或860~880℃;和/或步骤2)中,所述卷取温度550~620℃或570~620℃;和/或步骤2)中,所述层流前段快速冷却速度为100~120℃/s;和/或步骤3)中,所述冷轧累计压下率为60~70%;和/或步骤4)中,所述快速加热采用一段式加热时加热速率为50~300℃/s;和/或步骤4)中,所述快速加热采用两段式加热时,第一段以30~300℃/s的加热速率从室温加热至550~625℃(如550~620℃),第二段以50~300℃/s的加热速率从550~625℃(如550~620℃)加热至750~840℃;和/或步骤4)均热过程中,带钢或钢板加热至所述奥氏体和铁素体两相区目标温度后,保持温度不变进行均热;和/或步骤4)均热过程中,带钢或钢板在均热时间段内进行小幅度升温或小幅度降温,升温后温度不超过850℃,降温后温度不低于750℃;和/或所述均热时间为10~20s。
- 如权利要求13所述的方法,其特征在于,所述方法用于制造权利要求7所述的热镀铝锌或热镀锌铝镁复相钢,包括如下步骤:a)冶炼、铸造按上述化学成分冶炼并铸造成铸坯;b)热轧、冷却热轧出炉温度1150~1250℃,热轧终轧温度830~890℃,卷取温度520~650℃,轧后采用层流冷却,层流前段快速冷却速度为80~120℃/s;c)酸洗、冷轧冷却后酸洗,将带钢表面氧化铁皮清洗干净,冷轧累计压下率为60~80%;d)连续退火、热镀铝锌或热镀锌铝镁a.连续退火在无氧化连续退火镀铝锌或锌铝镁炉内进行连续退火,退火处理依次包括加热段、均热段、镀前冷却段,其中,加热段采用一段式或两段式加热;采用一段式快速加热时,加热速率为30~300℃/s;采用两段式快速加热时,第一段以10~300℃/s的加热速率从室温加热至550~625℃,第二段以30~300℃/s的加热速率从550~625℃加热至750~840℃;之后进行均热;均热温度750~840℃,均热时间1~20s;随后以30~150℃/s冷却速度冷却至550~600℃;b.热浸镀、冷却退火后进行热镀铝锌,热镀铝锌温度550~600℃;之后由550~600℃快速冷却至室温,获得热镀铝锌AZ产品,冷却速率为30~200℃/s;或者,退火后进行热镀锌铝镁,热镀锌铝镁温度550~600℃;之后由550~600℃快速冷却至室温,获得热镀锌铝镁AM产品,冷却速率为30~180℃/s;e)光整、拉矫平整率为0.25%+0.2,拉矫率为0.2%±0.2。
- 如权利要求15所述的方法,其特征在于,步骤d)所述连续退火、热镀铝锌或热镀锌铝镁全过程用时23~66s;和/或步骤b)中,所述热轧出炉温度为1180~1220℃;和/或步骤b)中,所述热轧终轧温度850~870℃;和/或步骤b)中,所述卷取温度550~620℃;和/或步骤b)中,所述层流前段快速冷却速度为100~120℃/s;和/或步骤c)中,所述冷轧累计压下率为60~70%;和/或步骤d)中,所述快速加热采用一段式加热时加热速率为50~300℃/s;和/或步骤d)中,所述快速加热采用两段式加热时,第一段以30~300℃/s的加热速率从室温加热至550~625℃,第二段以50~300℃/s的加热速率从550~625℃加热至750~840℃;和/或步骤d)均热过程中,带钢或钢板加热至所述奥氏体和铁素体两相区目标温度后,保持温度不变进行均热;和/或步骤d)均热过程中,带钢或钢板在均热时间段内进行小幅度升温或小幅度降温,升温后温度不超过840℃,降温后温度不低于750℃;和/或所述均热时间为10~20s。
- 如权利要求13所述的方法,其特征在于,所述方法用于制造权利要求10所述的热镀铝锌或热镀锌铝镁复相钢,包括以下步骤:A)冶炼、铸造按上述化学成分冶炼并铸造成铸坯;B)热轧、冷却热轧出炉温度1170~1250℃,热轧终轧温度850~890℃,卷取温度550~680℃,轧后采用层流冷却,层流前段快速冷却速度为80~120℃/s;C)酸洗、冷轧冷却后酸洗,将带钢表面氧化铁皮清洗干净,冷轧累计压下率为60~80%;D)连续退火、热镀铝锌或热镀锌铝镁a.连续退火在无氧化连续退火镀铝锌或锌铝镁炉内进行连续退火,退火处理依次包括加热段、均热段、镀前冷却段,其中,加热段采用一段式或两段式加热;采用一段式快速加热时,加热速率为30~300℃/s;采用两段式快速加热时,第一段以10~300℃/s的加热速率从室温加热至550~620℃,第二段以30~300℃/s的加热速率从550~620℃加热至770~850℃;之后进行均热;均热温度770~850℃,均热时间1~20s;随后以30~150℃/s冷却速度快速冷却至550~600℃;b.热镀铝锌或热镀锌铝镁退火后进行热镀铝锌,热镀铝锌温度550~600℃;之后由550~600℃快速冷却至室温,获得热镀铝锌AZ产品,冷却速率为30~200℃/s;或者,退火后进行热镀锌铝镁,热镀锌铝镁温度550-600℃;之后由550~600℃快速冷却至室温,获得热镀锌铝镁AM产品,冷却速率为30~180℃/s;E)光整、拉矫平整率为0.25%+0.2,拉矫率为0.2%±0.2。
- 如权利要求17所述的方法,其特征在于,步骤D)所述的连续退火、热镀铝锌或热镀锌铝镁全过程用时22~80s;和/或步骤B)中,所述热轧出炉温度为1180~1220℃;和/或步骤B)中,所述热轧终轧温度为860~880℃;和/或步骤B)中,所述卷取温度为570~620℃;和/或步骤B)中,所述层流前段快速冷却速度为100~120℃/s;和/或步骤C)中,所述冷轧累计压下率为60~70%;和/或步骤D)中,所述快速加热采用一段式加热时加热速率为50~300℃/s;和/或步骤D)中,所述快速加热采用两段式加热时,第一段以30~300℃/s的加热速率从室温加热至550~620℃,第二段以50~300℃/s的加热速率从550~620℃加热至770~850℃;和/或步骤D)均热过程中,带钢或钢板加热至所述奥氏体和铁素体两相区目标温度后,保持温度不变进行均热;和/或步骤D)均热过程中,带钢或钢板在均热时间段内进行小幅度升温或小幅度降温,升温后温度不超过850℃,降温后温度不低于770℃;和/或所述均热时间为10~20s。
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