CN106834938A - 400MPa级超低碳高强镀锌带钢及其生产方法 - Google Patents

400MPa级超低碳高强镀锌带钢及其生产方法 Download PDF

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CN106834938A
CN106834938A CN201710031686.4A CN201710031686A CN106834938A CN 106834938 A CN106834938 A CN 106834938A CN 201710031686 A CN201710031686 A CN 201710031686A CN 106834938 A CN106834938 A CN 106834938A
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galvanized steel
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刘靖宝
李建英
夏明生
弓俊杰
韩冰
王嘉伟
王言峰
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Tangshan Iron and Steel Group Co Ltd
HBIS Co Ltd Tangshan Branch
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Abstract

本发明公开了一种400MPa级超低碳高强镀锌带钢及其生产方法，其基板成分的质量百分含量为：C≤0.0050%，Si 0.05～0.10%，Mn 0.50～0.95%，P 0.055～0.085%，S≤0.012%，Als 0.025～0.055%，Nb 0.015～0.030%，Ti 0.020～0.030%，B 0.0005～0.0015%，N≤0.0050%，其余为Fe和不可清除的杂质。本发明采用Ti来固定钢中的间隙原子C和N，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400MPa以上，且生产简单，成本较低，具有很好的应用前景。本方法采用新的成分设计，通过控制各工艺参数来生产冲压高强钢的方法，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，成型性能优异的特点。

Description

400MPa级超低碳高强镀锌带钢及其生产方法
技术领域
本发明涉及一种镀锌带钢，尤其是一种400MPa级超低碳高强镀锌带钢及其生产方法。
背景技术
随着全球汽车行业的长足发展，节能、环保和安全已成为其今后发展的主导趋势。汽车的能耗和其自重呈线性关系，如自重减轻10%，则油耗可降低8%，排放降低4%，显然轻量化对汽车的节能和降低排放意义重大。目前，汽车主体厂为了降低车身自重，广泛的使用高强钢来代替普通的钢板。如先进高强钢中的双相钢和相变诱导塑性钢，先进超高强钢(AHSS)应用于汽车零部件制造的优点在于材料强度提高后零件厚度可以减薄，从而使汽车整体用材减少，质量减轻，汽车油耗和排放量亦随之减小。在减轻汽车质量的同时，汽车碰撞安全性能因其材质高强而得到了保证。故无论从节能降耗还是安全性能角度看先进超高强钢都是汽车用钢的最佳材料。
众所周知，在固溶强化元素中，主要有磷、锰和硅等，其中磷的强化效果最显著，应用最广，一般认为1%质量分数的固溶磷会将铁素体基体的强度提高约700MPa，因此，超低碳的含磷高强钢应用广泛，但是磷过高会带来一个负面效果，就是无论采用Ti还是Nb来固定间隙原子，都会因为析出FeTiP和FeNbP相弱化钢种的性能，对材料的机械性能和成型性能不利，同时由于含磷相的析出会弱化其固溶强化效果。在减重的同时，对高强钢的耐蚀性也提出了更高的要求。
目前，在世界范围内乘用车的外板主要采用热镀锌钢板。一般情况下，车身表面的多层涂装能为镀锌钢板提供有效的防护，但是当涂层因外力破损后就会对镀锌钢板失去保护作用，如果镀锌层也同时遭到破坏，则车身局部就会暴露出由镀锌层和钢材基板构成的复相金属耦合电极，在环境的大气、雨水和含融雪盐泥浆的作用下发生加速破坏，导致车身穿孔。目前关于高强镀锌带钢的生产存在难度大，生产成本高，合格率低等不足之处。
发明内容
本发明要解决的技术问题是提供一种工艺简单、成本低的400MPa级超低碳高强镀锌带钢；本发明还提供了一种400MPa级超低碳高强镀锌带钢的生产方法。
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≤0.0050%，Si 0.05～0.10%，Mn 0.50～0.95%，P 0.055～0.085%，S≤0.012%，Als 0.025～0.055%，Nb 0.015～0.030%，Ti 0.020～0.030%，B 0.0005～0.0015%，N≤0.0050%，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、连续镀锌和光整工序，所述镀锌带钢的基板成分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900～950℃，卷取温度为680～720℃。
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800～830℃；缓冷结束670～730℃，快冷结束440～490℃；镀锌温度458～462℃。所述连续镀锌工序中，退火工艺保温时间100～200s，缓冷冷却速率5～10℃/s，快冷冷却速率20～60℃/s，镀锌时间5～15s。
本发明方法所述光整工序：光整延伸率为0.5%～2.0%。
本发明方法所述加热工序：加热温度为1150～1250℃，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Ti来固定钢中的间隙原子C和N，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400MPa以上，且生产简单，成本较低，具有很好的应用前景。
本发明方法采用新的成分设计，通过控制炼钢、连铸、热轧、冷轧、连续镀锌和光整等工艺参数来生产冲压高强钢的方法，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，成型性能优异的特点。
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1～12：本400MPa级超低碳高强镀锌带钢采用下述方法生产而成。
采用表1所述化学成份的连铸坯，经加热、热轧、冷轧、连续镀锌和光整工序制备而成；加热工序采用步进式加热炉加热，连铸坯的加热温度为1150～1250℃，总加热时间为90～180min；热轧工序采用精轧终轧温度为900～950℃，卷取温度为680～720℃；冷轧工序的冷轧压下率为75%及以上；连续镀锌工序采用加热温度为800～830℃，均热温度为800～830℃，缓冷结束温度670～730℃，快冷结束温度440～490℃，镀锌温度（锌液温度）458～462℃，退火工艺保温时间100～200s，缓冷冷却速率5～10℃/s，快冷冷却速率20～60℃/s，镀锌时间5～15s；光整工序采用的光整延伸率为0.5～2.0%；加热、热轧、冷轧和光整工序的工艺参数见表2，连续镀锌的工艺参数见表3。
表1：实施例1－12连铸坯的化学成分(wt.%)
表1中，余量为Fe和不可清除的杂质。
表2：实施例1－12加热、热轧、冷轧和光整工序的工艺参数
表3：实施例1－12连续镀锌的工艺参数
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1－12所得产品的力学性能
实施例 抗拉强度MPa 屈服强度MPa 伸长率% n值 r值
1 421 298 34 0.19 2
2 424 276 34.5 0.19 2.15
3 423 271 35 0.21 2.25
4 424 273 34.5 0.21 2.35
6 423 291 35.5 0.19 2.15
7 405 267 36 0.19 2.25
8 423 287 35.5 0.19 2.15
9 406 294 36.5 0.19 2.10
10 402 271 35 0.2 2.05
11 405 273 35 0.19 2.1
12 411 282 34 0.19 2.2

Claims (8)

1.一种400MPa级超低碳高强镀锌带钢，其特征在于，其基板成分的质量百分含量为：C≤0.0050%，Si 0.05～0.10%，Mn 0.50～0.95%，P 0.055～0.085%，S≤0.012%，Als 0.025～0.055%，Nb 0.015～0.030%，Ti 0.020～0.030%，B 0.0005～0.0015%，N≤0.0050%，其余为Fe和不可清除的杂质。
2.一种400MPa级超低碳高强镀锌带钢的生产方法，其特征在于：其包括加热、热轧、冷轧、连续镀锌和光整工序，所述镀锌带钢的基板成分质量百分含量为：C≤0.0050%，Si 0.05～0.10%，Mn 0.50～0.95%，P 0.055～0.085%，S≤0.012%，Als 0.025～0.055%，Nb 0.015～0.030%，Ti 0.020～0.030%，B 0.0005～0.0015%，N≤0.0050%，其余为Fe和不可清除的杂质。
3.根据权利要求2所述的400MPa级超低碳高强镀锌带钢的生产方法，其特征在于，所述热轧工序：精轧终轧温度为900～950℃，卷取温度为680～720℃。
4.根据权利要求2所述的400MPa级超低碳高强镀锌带钢的生产方法，其特征在于，所述冷轧工序：冷轧压下率≥75%。
5.根据权利要求2所述的400MPa级超低碳高强镀锌带钢的生产方法，其特征在于，所述连续镀锌工序：均热温度为800～830℃；缓冷结束670～730℃，快冷结束440～490℃；镀锌温度458～462℃。
6.根据权利要求5所述的400MPa级超低碳高强镀锌带钢的生产方法，其特征在于：所述连续镀锌工序中，退火工艺保温时间100～200s，缓冷冷却速率5～10℃/s，快冷冷却速率20～60℃/s，镀锌时间5～15s。
7.根据权利要求2所述的400MPa级超低碳高强镀锌带钢的生产方法，其特征在于，所述光整工序：光整延伸率为0.5%～2.0%。
8.根据权利要求2－7任意一项所述的400MPa级超低碳高强镀锌带钢的生产方法，其特征在于，所述加热工序：加热温度为1150～1250℃，总加热时间为90～180min。
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107513668A (zh) * 2017-07-20 2017-12-26 首钢集团有限公司 一种热镀锌板及其加工方法
CN109604336A (zh) * 2018-10-24 2019-04-12 首钢京唐钢铁联合有限责任公司 一种热镀锌板的制备方法及装置

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