CN116200680A - 一种通卷性能均匀的冷轧超高强钢及生产方法 - Google Patents
一种通卷性能均匀的冷轧超高强钢及生产方法 Download PDFInfo
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Abstract
一种通卷性能均匀的冷轧超高强钢,其化学成分及wt%为:C:0.070~0.14%,Mn:1.80~2.40%,Als:0.035~0.30%,Si:0.10~0.80%,Nb:0.005~0.050%,Cr:0.25~0.65%,Ti:0.005~0.060%,P:≤0.015%,S:≤0.004%,N:≤0.003%;生产方法:冶炼结束后常规连铸;对铸坯加热;热轧;层流冷却;卷取;常规酸洗后冷轧;连续退火;缓慢冷却;快速冷却;时效处理;平整。本发明在保证抗拉强度≥780MPa下,通卷钢卷的头、中、尾强度差控制在40MPa以内,且无需采取边部遮挡、电磁搅拌、边部加热。
Description
技术领域
本发明涉及一种汽车用冷轧钢及生产方法,具体属于一种通卷性能均匀的冷轧超高强钢及生产方法。
背景技术
近年来,随着汽车节能减排技术的推进,汽车轻量化成为一种发展趋势。780MPa级及以上的超高强钢是汽车轻量化材料的发展方向之一,超高强钢的生产制造过程中,通常会添加较多的Mn、Si、Nb、Cr等合金元素,并由于制造过程中生产工艺的不均匀性造成生产的带钢性能出现较大的差别。
现有提高或改善超高强钢组织和性能均匀性的技术方法包括:1)对热轧卷进行罩式退火处理;2)在550~580℃温度卷取,提高热轧卷宽度方向上的组织和性能均匀性;3)控制钢水中的成份波动至较窄的范围;4)减少热轧卷头尾的冷却水量,对含Nb微合金钢采用低温卷取等方法来改善带钢的性能均匀性。现有技术中存在以下问题:1)对热轧卷进行罩式退火增加了生产工序和生产成本,降低了生产效率;2)某些方法只针对提升宽度方向上的性能均匀性;3)控制钢水中的成分波动只能减少不同卷之间的性能波动,并不能提高通卷钢的性能均匀性;4)热轧采用头尾减少冷却水量的效果较弱,尤其对合金含量较高的钢种,其效果更小。
经检索:
中国专利公开号为CN 109576467A的文献,其公开了一种《提高含Nb低合金高强钢通卷性能均匀性的控制方法》,其技术措施:主要在热轧卷取时采用低温卷取工艺300~550℃移植钢卷冷却过程中Nb的碳氮化物的析出行为,使Nb元素更的固溶,避免钢卷因析出行为波动造成的统计性能不均,此技术主要针对最终产品抗拉强度低于780MPa的产品,其合金含量少,但对于合金含量高,尤其Mn含量较高的产品,低温卷取造成热轧产品强度高,板形差,后续酸轧困难等问题。中国专利公开号为CN 113234906A的文献,其公开了《一种提高高强钢性能均匀性的生产方法和高强钢》,其技术措施:适当降低卷取温度至550~580℃以减少板宽边部和中部的温度差,从而减少板宽方向的组织性能差异,其主要目的是提高钢卷宽度方向上的组织性能均匀性,没有涉及钢卷通卷组织性能均匀性的技术措施。
中国专利公开号为CN 113025795A的文献,其公开了《一种提高冷轧高强钢组织均匀性的方法》,其技术措施:通过(1)减少钢水成分波动,(2)在热轧时对边部进行补偿加热,(3)对热轧卷进行罩式退火等措施来提高钢卷长度和宽度方向上的组织性能均匀性。上述方案减少钢水成分波动对减小不同炉钢卷的性能波动有明显效果,但对单卷的头中尾性能波动无显著效果;需要在热轧增加边部补偿加热装备,增加投资;罩式退火增加生产工序和生产成本,导致效率降低,同时能耗和排放增加,不利于环保。
发明内容
本发明在于克服现有技术存在的不足,提供一种在保证抗拉强度≥780MPa下,通卷钢卷的头、中、尾强度差控制在40MPa以内,且无需采取边部遮挡、电磁搅拌、边部加热的通卷性能均匀的冷轧超高强钢及生产方法。
实现上述目的的措施:
一种通卷性能均匀的冷轧超高强钢,其组分及重量百分比含量为:C:0.070~0.14%,Mn:1.80~2.40%,Als:0.035~0.30%,Si:0.10~0.80%,Nb:0.005~0.050%,Cr:0.25~0.65%,Ti:0.005~0.060%,P:≤0.015%,S:≤0.004%,N:≤0.003%,其余为Fe和不可避免的杂质。
优选地:Nb的重量百分比含量为0.010~0.047%。
优选地:Ti的重量百分比含量为0.010~0.056%。
优选地:Cr的重量百分比含量为0.25~0.55%。
一种通卷性能均匀的冷轧超高强钢的生产方法,其步骤:
1)冶炼结束后常规连铸,冶炼期间采用RH、LF进行精炼;
2)对铸坯进行加热,并控制铸坯出炉温度在1250~1280℃,在1250~1280℃间加热时间
控制在40~60min;
3)进行热轧,控制终轧温度在860~900℃,控制终轧期间钢卷头中尾的温度差
≤30℃;
4)进行层流冷却,其间:采用前段快速水冷方式,当贝氏体转变温度Bs在Bs-20~Bs-80℃范围的任一点时停止水冷;带钢停止水冷后至卷取前进行空冷,空冷时间≥10s;
5)进行卷取,其间冷却水为关闭状;
6)经进行常规酸洗后进行冷轧,总压下率控制在50~70%;
7)进行连续退火,控制退火均热温度在810~850℃,均热时间在100~300s;
8)进行缓慢冷却,冷却至600~650℃;
9)进行快速冷却,在冷却速度≤50℃/s下冷却至Ms-20℃以下;
10)进行时效处理,控制时效温度在Ms-60~Ms-20℃,时效处理时间在400~
700s;
11)进行平整,除头、尾各为50m外的中部平整延伸率控制在0.40~1.20%,头、尾各自50m内的平整延伸率按照小于中部平整延伸率进行控制,即控制头、尾的平整延伸率在0.3~1.10%。
其在于:贝氏体转变温度Bs按照公式Bs=732-202C-85Mn+116Si-47Cr进行计算,式中:C、Mn、Si、Cr的取值均为纯小数。
优选地:退火均热时间在145~300s。
优选地:Ms按照公式Ms=439-346*C-38*Mn-12.1*Cr-11*Si计算,时效处理时间在385~635s。
优选地:头、尾各自50m内的平整延伸率在0.35~1.0%,中间部分延伸率在0.45~1.10%。
本发明中各原料及主要工艺的作用及机理
C:碳起到固溶强化作用,提高钢材强度,但碳含量高对工艺的敏感性增加,加大通卷组织差异,降低性能均匀性。综合考虑强度和性能均匀性,钢中的C含量选择为0.070%~0.14%。
Mn:Mn在钢中起到固溶强化,提高强度,并稳定奥氏体、促进马氏体形成,但Mn含量过高,相变温度降低,使奥氏体相变速率变慢,在卷取前难以发生完全相变,综合考虑,本发明Mn含量为1.80~2.40%。
Si:Si可提高钢材的强度,但Si会推迟珠光体和贝氏体的转变,造成其相变时间延长,造成在卷取前难以发生完全相变,最终造成头中尾性能出现较大差异,综合考虑性能和相变的影响,本发明中Si含量为0.10~0.80%。
Al:Al扩大相变区间,降低工艺敏感性,有利于钢卷头中尾获得同一组织,增加组织均匀性,减少性能差异,但添加过多的Al,增加钢材的成本。因此本发明中Al含量为0.035~0.30%。
S:S为钢中的杂质元素,易与钢中的Al结合形成AlS,并作为后续析出物形核的质点,诱导Nb、Ti的不均匀析出。但S含量过低时,增加生产费用,因此根据成本和性能控制考虑,应控制在≤0.004%。
N:N为钢中的杂质元素,容易和钢中Al、Nb、Ti等形氮化物粒子,与钢中的Al和Ti在钢液中析出,形成AlN和TiN,这些可能会成为后续析出物的形核质点,造成不均匀析出,因此尽量降低其含量,但N含量控制过低,需增加生产费用,综合性能和成本考虑,N应控制在0.003%以下。
Cr:Cr在一定卷取温度下可促进钢中B的形成,避免相变时间较长的珠光体区,有利于相变在卷取前发生,因此本发明中Cr含量为0.25~0.65%。优选地Cr的重量百分比含量为0.25~0.55%。
Nb:Nb在连退均热过程中,Nb会显著阻碍铁素体晶粒的回复与再结晶,并析出NbC等析出物,影响带钢组织和性能均匀性,因此,从提高产品均匀性方面考虑,Nb在钢中的含量越低越好,但同时考虑Nb和显著提高产品的强度,因此本发明中Nb的含量为0.005~0.050%;优选地Nb的重量百分比含量为0.010~0.047%。
Ti:Ti与Nb在钢中的作用类似,可起到析出强化的作用,但Ti的析出受温度的影响更大,同时从提高性能和均匀性方面考虑,本发明中Ti的含量为0.010~0.060%。优选地Ti的重量百分比含量为0.010~0.056%。
对本发明中主要工艺理由说明如下:
通过研究发现,钢卷通卷性能不均匀的一方面原因在于热轧时的组织不均匀,主要体现在热轧钢卷头尾为贝氏体组织,而钢卷中部为粗大的铁素体+珠光体组织,造成这种组织差异在于钢卷在卷取前没有发生充分的相变,卷取后,钢卷头尾冷却快而中间冷却慢,因此造成头中尾的组织差异,为解决此问题,本发明在产品成分工艺设计时,在保证性能的前提下,尽量减少致使相变变慢的合金元素Si、Mn、Cr等,促使热轧卷在卷取前就发生充分相变,从而减少头中尾组织差异;通过控制热轧层流冷却方式,使钢卷快速进入贝氏体相变区,并增加此区间的相变时间,提高相变发生率;在卷取时,关闭用于冷却卷取的卷取冷却水,减少对钢卷的过度冷却,从而进一步减少头部与中部的组织性能差异;通过控制热轧的头、中、尾的终轧温度差可进一步提高头中尾的相变均匀性和析出均匀性。
在连续退火过程中,Nb、Ti阻碍组织中的铁素体的回复和再结晶,并由于形核质点的影响及工艺波动的影响,造成头中尾析出物尺寸及数量不均匀,因此通过提高均热温度和增加均热时间,促进头中尾的充分再结晶和回复,并使钢中的Nb、Ti充分析出,减少头中尾的组织及性能差异。经研究发现,缓慢的冷却速度、较长的时效时间和较高的时效温度可以提高钢卷头中尾的组织性能均匀性,但同时为了确保强度,因此本发明采用≤50℃/s的快速冷却速度、Ms-20℃的快冷温度、时效温度Ms-60~Ms-20℃和时效时间400~700s。研究发现,冷轧带钢通过平整增加钢中的位错可显著提高钢材的强度,但由于头中尾的组织差异,相同的平整延伸率也会造成头中尾性能提升存在差异,因此本发明采用头、尾各50m采用较低的平整延伸率,从而提高产品的组织和性能均匀性。
本发明与现有技术相比,本发明在保证抗拉强度≥780MPa下,通卷钢卷的头、中、尾强度差控制在40MPa以内,且无需采取边部遮挡、电磁搅拌、边部加热。
具体实施方式
下面对本发明予以详细描述:
表1为本发明各实施例及对比例的化学成分列表;
表2为本发明各实施例及对比例的主要工艺参数列表;
表3为本发明各实施例及对比例性能检测情况列表。
本发明各实施例按照以下步骤生产
1)冶炼结束后常规连铸,冶炼期间采用RH、LF进行精炼;
2)对铸坯进行加热,并控制铸坯出炉温度在1250~1280℃,在1250~1280℃间加热时间
控制在40~60min;
3)进行热轧,控制终轧温度在860~900℃,控制终轧期间钢卷头中尾的温度差
≤30℃;
4)进行层流冷却,其间:采用前段快速水冷方式,当贝氏体转变温度Bs在Bs-20~Bs-80℃范围的任一点时停止水冷;带钢停止水冷后至卷取前进行空冷,空冷时间≥10s;
5)进行卷取,其间冷却水为关闭状;
6)经进行常规酸洗后进行冷轧,总压下率控制在50~70%;
7)进行连续退火,控制退火均热温度在810~850℃,均热时间在100~300s;
8)进行缓慢冷却,冷却至600~650℃;
9)进行快速冷却,在冷却速度≤50℃/s下冷却至Ms-20℃以下;
10)进行时效处理,控制时效温度在Ms-60~Ms-20℃,时效处理时间在400~700s;
11)进行平整,除头、尾各为50m外的中部平整延伸率控制在0.40~1.20%,头、尾各自50m内的平整延伸率按照小于中部平整延伸率进行控制,即控制头、尾的平整延伸率在0.3~1.10%。
表1本发明各实施例及对比例的化学成分列表(wt%)
表2本发明各实施例及对比例的主要工艺参数列表
续表2
表3本发明各实施例及对比例力学性能检测结果列表
从表3可以看出,本发明实施例1~8产品头中尾的屈服强度、抗拉强度之差均小于40MPa,头中尾性能均匀性良好。
说明:对比例1成分中含有较高的Si、Mn元素,Al含量较低,N含量较高,对比例2中含有较高的Nb、Ti元素,对比例3含有较高C和Cr元素,且对比例1层流冷却水冷停止温度高,导致钢卷中部处于珠光体转变区,而头尾处于贝氏体转变区,对比例3卷取后卷取冷却水打开,导致头部冷却强度大,对比例3层流冷却空冷时间短,因此对比例1~3在热轧后钢卷的头、中、尾组织存在较大差异,导致成品性能不均匀。
对比例3-1由于热轧卷取后卷取冷却水打开导致头部冷却强度大,最终导致成品性能不均匀。
对比例4-1由于头中尾平整延伸率差异下,导致最终产品性能不均。
对比例5-1由于快冷温度和时效温度过低,导致产品最终性能不均。
本具体实施方式仅为最佳例举,并非对本发明技术方案的限制性实施。
Claims (9)
1.一种通卷性能均匀的冷轧超高强钢,其组分及重量百分比含量为:C:0.070~0.14%,Mn:1.80~2.40%,Als:0.035~0.30%,Si:0.10~0.80%,Nb:0.005~0.050%,Cr:0.25~0.65%,Ti:0.005~0.060%,P:≤0.015%,S:≤0.004%,N:≤0.003%,其余为Fe和不可避免的杂质。
2.如权利要求1所述的一种通卷性能均匀的冷轧超高强钢,其特征在于:Nb的重量百分比含量为0.010~0.047%。
3.如权利要求1所述的一种通卷性能均匀的冷轧超高强钢,其特征在于:Ti的重量百分比含量为0.010~0.056%。
4.如权利要求1所述的一种通卷性能均匀的冷轧超高强钢,其特征在于:Cr的重量百分比含量为0.25~0.55%。
5.如权利要求1所述的一种通卷性能均匀的冷轧超高强钢的生产方法,其步骤:
1)冶炼结束后常规连铸,冶炼期间采用RH、LF进行精炼;
2)对铸坯进行加热,并控制铸坯出炉温度在1250~1280℃,在1250~1280℃间加热时间
控制在40~60min;
3)进行热轧,控制终轧温度在860~900℃,控制终轧期间钢卷头中尾的温度差≤30℃;
4)进行层流冷却,其间:采用前段快速水冷方式,当贝氏体转变温度Bs在Bs-20~Bs-80℃范围的任一点时停止水冷;带钢停止水冷后至卷取前进行空冷,空冷时间≥10s;
5)进行卷取,其间冷却水为关闭状;
6)经进行常规酸洗后进行冷轧,总压下率控制在50~70%;
7)进行连续退火,控制退火均热温度在810~850℃,均热时间在100~300s;
8)进行缓慢冷却,冷却至600~650℃;
9)进行快速冷却,在冷却速度≤50℃/s下冷却至Ms-20℃以下;
10)进行时效处理,控制时效温度在Ms-60~Ms-20℃,时效处理时间在400~700s;
11)进行平整,除头、尾各为50m外的中部平整延伸率控制在0.40~1.20%,头、尾各自50m内的平整延伸率按照小于中部平整延伸率进行控制,即控制头、尾的平整延伸率在0.3~1.10%。
6.如权利要求5所述的一种通卷性能均匀的冷轧超高强钢的生产方法,其特征在于:贝氏体转变温度Bs按照公式Bs=732-202C-85Mn+116Si-47Cr进行计算,式中:C、Mn、Si、Cr的取值均为纯小数。
7.如权利要求5所述的一种通卷性能均匀的冷轧超高强钢的生产方法,其特征在于:均热时间在145~300s。
8.如权利要求5所述的一种通卷性能均匀的冷轧超高强钢的生产方法,其特征在于:Ms按照公式Ms=439-346*C-38*Mn-12.1*Cr-11*Si计算,时效处理时间在385~635s。
9.如权利要求5所述的一种通卷性能均匀的冷轧超高强钢的生产方法,其特征在于:头、尾各自50m内的平整延伸率在0.35~1.0%,中间部分延伸率在0.45~1.10%。
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