CN107142425B - 780MPa级双相高强镀锌带钢及其制备方法 - Google Patents

780MPa级双相高强镀锌带钢及其制备方法 Download PDF

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CN107142425B
CN107142425B CN201710235581.0A CN201710235581A CN107142425B CN 107142425 B CN107142425 B CN 107142425B CN 201710235581 A CN201710235581 A CN 201710235581A CN 107142425 B CN107142425 B CN 107142425B
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刘靖宝
杜明山
夏明生
王嘉伟
王鹏
张琳
刘丽萍
宋海武
李勃
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HBIS Co Ltd Tangshan Branch
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    • C21—METALLURGY OF IRON
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Abstract

本发明公开了一种780MPa级双相高强镀锌带钢及其制备方法，其包括加热、热轧、冷轧、连续镀锌、光整和钝化工序；所述镀锌带钢基板成分的质量百分含量为：C≤0.20%，Si≤0.50%，Mn 1.70～2.50%，Cr 0.40～0.70%，P≤0.012%，S≤0.002%，Als≤0.070%，其余为Fe和不可清除的杂质。本镀锌带钢采用添加Mn和Cr元素来提高钢的淬透性，增加快冷过程中马氏体的生成比例；其成品具有良好的成型性能、机械性能和抗腐蚀性能，抗拉强度在780MPa以上，且生产简单，成本较低。本方法采用新的成分设计，通过控制各工序的工艺参数进行制备，大大降低了生产成本，提高了合格率；具有生产简单，实施难度小，成本低，生产稳定，具有烘烤硬化效应和屈强比低等特点。

Description

780MPa级双相高强镀锌带钢及其制备方法
技术领域
本发明涉及一种镀锌带钢，尤其是一种780MPa级双相高强镀锌带钢及其制备方法。
背景技术
随着汽车工业发展、汽车产量与保有量的增加，必然面临油耗、安全和环保三方面的问题。汽车轻量化越来越得到业界的重视，高强钢在汽车用钢中的比例越来越高；同时带钢的耐蚀性决定汽车的使用寿命，目前国内热镀锌带钢的产量逐年增加。
DP系列高强钢镀锌汽车板产品的显微组织由铁素体和马氏体组成，马氏体组织以岛状弥散分布在铁素体的基体上。铁素体较软，使钢材具备较好的成形性；马氏体较硬，使钢材具备较高的强度。随着马氏体所占比例的升高其强度越高。根据用途，可生产不同强度级别和不同屈强比(YS/TS) 的双相钢。双相钢易切割成形，可用传统的焊接方法焊接。其具备无屈服延伸、无室温时效、低屈强比、高加工硬化指数和烘烤硬化值的特点。
高强镀锌带钢的生产过程中，工艺参数的控制决定着带钢的板型、表面质量和力学性能。同时由于Mn和Si元素的添加量较多，在退火过程中，Mn和Si元素向表面富集，生成氧化物，再后续还原过程中不能被还原，造成带钢表面与纯锌的粘附性降低，甚至会造成锌层的漏镀。常规780MPa级双相高强镀锌带钢需要添加Ti、Nb和Mo等合金元素，造成其生产成本较高。
发明内容
本发明要解决的技术问题是提供一种低成本的780MPa级双相高强镀锌带钢；本发明还提供了一种工艺简单的780MPa级双相高强镀锌带钢的制备方法。
为解决上述技术问题，本发明基板成分的质量百分含量为：C≤0.20%，Si≤0.50%，Mn 1.70～2.50%，Cr 0.40～0.70%，P≤0.012%，S≤0.002%，Als≤0.070%，其余为Fe和不可清除的杂质。
本发明方法包括加热、热轧、冷轧、连续镀锌、光整和钝化工序；所述镀锌带钢基板成分的质量百分含量如上所述。
本发明方法所述热轧工序：精轧终轧温度为875～905℃，卷取温度为660～700℃。
本发明方法所述冷轧工序：冷轧压下率≥75%。
本发明方法所述连续镀锌工序：均热温度为770～830℃；先缓冷至690～730℃，再快冷至420～450℃；镀锌温度458～462℃。所述连续镀锌工序中，均热时间为100～200s，缓冷冷却速率10～20℃/s，快冷冷却速率35～65℃/s，镀锌时间5～15s。所述连续镀锌工序包括预热段、加热段1和加热段2；所述预热段露点为-5℃～+15℃，加热段1露点为-5℃～+10℃，加热段2露点为-5℃～-30℃。
本发明方法所述光整工序：光整延伸率为0.2%～1.2%。
本发明方法所述钝化工序：钝化温度80～120℃。
本发明方法所述加热工序：加热温度为1250～1320℃，总加热时间为90～180min。
采用上述技术方案所产生的有益效果在于：本发明采用添加Mn和Cr元素来提高钢的淬透性，增加快冷过程中马氏体的生成比例；并在带钢表面镀上一层纯锌层，有效的阻碍了基体的腐蚀，其成品具有良好的成型性能、机械性能和抗腐蚀性能，抗拉强度在780MPa以上，且生产简单，成本较低，具有很好的应用前景。
本发明方法采用添加Mn和Cr元素来提高钢的淬透性，增加快冷过程中马氏体的生成比例；但是Si和Mn元素向表面富集，容易产生漏镀，本方法通过调整炉区的露点值，避免漏镀的产生，并在带钢表面镀上一层纯锌层，有效的阻碍了基体的腐蚀，其成品具有良好的成型性能、机械性能和抗腐蚀性能，抗拉强度在780MPa以上，且生产简单，成本较低。本方法采用新的成分设计，通过控制各工序的工艺参数进行制备，大大降低了生产成本，提高了合格率；具有生产简单，实施难度小，成本低，生产稳定，具有烘烤硬化效应和屈强比低等特点。
具体实施方式
下面结合具体实施例对本发明作进一步详细的说明。
实施例1～10：本780MPa级双相高强镀锌带钢采用下述方法制备而成。
（1）各实施例采用表1所述化学成份的连铸坯进行生产。
表1：实施例1－10连铸坯的化学成分(wt.%)
表1中，余量为Fe和不可清除的杂质。
（2）上述连铸坯经加热、热轧、冷轧、连续镀锌、光整和钝化工序制备得到所述的双相高强镀锌带钢。加热工序采用步进式加热炉加热，连铸坯的加热温度为1250～1320℃，总加热时间为90～180min。热轧工序的精轧终轧温度为875～905℃，卷取温度为660～700℃。冷轧工序的冷轧压下率为75%及以上。连续镀锌工序的均热温度为770～830℃，缓冷结束温度690～730℃，快冷结束温度420～450℃，镀锌温度（锌液温度）458～462℃；所述连续镀锌工序包括预热段、加热段1和加热段2；所述预热段露点为-5℃～+15℃（目标值+5℃），加热段1露点为-5℃～+10℃（目标值+3℃），加热段2露点为-5℃～-30℃（目标值-20℃）；均热时间为100～200s，缓冷冷却速率10～20℃/s，快冷冷却速率35～65℃/s，镀锌时间5～15s。光整工序的光整延伸率为0.2～1.2%。钝化工序的钝化温度为80～120℃。各实施例中加热、热轧、冷轧、光整和钝化工序的工艺参数见表2，连续镀锌的工艺参数见表3。
表2：各实施例加热、热轧、冷轧和光整工序的工艺参数
表3：各实施例连续镀锌的工艺参数
（3）各实施例所得镀锌带钢进行性能检测，取横向试样，试样标距为80mm，平行段的宽度为25mm，检测得到的力学性能见表4。
表4：实施例1－10所得产品的力学性能

Claims (5)

1.一种780MPa级双相高强镀锌带钢的制备方法，其特征在于：其包括加热、热轧、冷轧、连续镀锌、光整和钝化工序；所述镀锌带钢基板成分的质量百分含量为：C 0.15-0.19%，Si0.22-0.35%，Mn 1.85-2.17%，Cr 0.40～0.53%，P≤0.012%，S≤0.002%，Als 0.041-0.070%，其余为Fe和不可清除的杂质；所述连续镀锌工序：均热温度为790～825℃；先缓冷至690～730℃，再快冷至440-445℃；镀锌温度458～462℃；均热时间为100～200s，缓冷冷却速率10～20℃/s，快冷冷却速率35～65℃/s，镀锌时间5～15s；
所述冷轧工序：冷轧压下率≥75%；
所述连续镀锌工序包括预热段、加热段1和加热段2；所述预热段露点为-5℃～+15℃，加热段1露点为-5℃～+10℃，加热段2露点为-5℃～-30℃。
2.根据权利要求1所述的780MPa级双相高强镀锌带钢的制备方法，其特征在于，所述热轧工序：精轧终轧温度为875～905℃，卷取温度为660～700℃。
3.根据权利要求1所述的780MPa级双相高强镀锌带钢的制备方法，其特征在于，所述光整工序：光整延伸率为0.2%～1.2%。
4.根据权利要求1所述的780MPa级双相高强镀锌带钢的制备方法，其特征在于，所述钝化工序：钝化温度为80～120℃。
5.根据权利要求1－4任意一项所述的780MPa级双相高强镀锌带钢的制备方法，其特征在于，所述加热工序：加热温度为1250～1320℃，总加热时间为90～180min。
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