CN107794445A - 热镀锌钢板及其制备方法 - Google Patents
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- 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
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
Abstract
本发明属于钢板制造技术领域,具体涉及一种热镀锌钢板及其制备方法。针对现有方法制备的热镀锌钢板力学性能欠佳、延伸性能不好等问题,本发明提供了一种热镀锌钢板及其制备方法,本发明热镀锌钢板的化学成分为:按重量百分比计,C:0.001~0.005%,Si:0.06~0.14%,Mn:0.25~0.50%,P:0.025~0.060%,S:≤0.015%,Als:0.015~0.060%,Nb:0.015~0.045%,Ti:0.010~0.060%,B:0.0005~0.0020%,余量为Fe和不可避免的杂质。其制备方法为:将冶炼钢水经冶炼‑热轧‑酸轧‑热镀锌退火工序后,得到热镀锌钢板。本发明制备的热镀锌钢板屈服强度为220~260MPa、抗拉强度为350~400MPa、延伸率≥35.0%、n90≥0.18、r90≥1.5,力学性能和成型性能优良,能够满足汽车外板用户使用要求。
Description
技术领域
本发明属于钢板制造技术领域,具体涉及一种热镀锌钢板及其制备方法。
背景技术
烘烤硬化热镀锌钢板是一种新型钢板,其广泛应用于汽车零件制备领域。烘烤硬化热镀锌钢板不仅要具有优良的冲压成形性能及表面外观质量,同时还要具有一定抗凹陷性能和烘烤硬性能,以降低高速行驶过程的噪声。
现有的生产烘烤硬化热镀锌钢板的方法主要有下面几种:
专利200710048926.8《深冲光整热镀锌钢板的生产方法》公开了一种热镀锌钢板,控制C:0.003~0.006%,Ti:0.02~0.04%,热轧卷取温度70~780℃,冷轧退火温度780~880℃。成品屈服强度180MPa左右,抗拉强度310MPa左右,伸长率42.0%左右,n在0.21左右,r在1.9左右。
专利201210338992.X《一种汽车用热镀锌钢板及其生产方法》公开了一种热镀锌钢板,组成为:C:0.001~0.003%、Si:≤0.03%、Mn:0.05~0.15%、P:≤0.02%、S:0.008~0.015%、Als:0.02~0.07%、Ti:0.05~0.09%,B:0.0002~0.01%。其余由Fe。成品屈服强度160MPa左右,抗拉强度2870MPa左右,伸长率44.0%左右,r90值2.4左右,n90值0.24。
上述方法虽能制备得到热镀锌钢板,但热镀锌钢板的屈服强度和抗拉强度都较低,力学性能欠佳。
发明内容
本发明要解决的技术问题为:现有方法制备的热镀锌钢板力学性能欠佳、延伸性能不好等问题。
本发明解决上述技术问题的技术方案为:提供一种热镀锌钢板及其制备方法,该热镀锌钢板屈服强度为220~260MPa、抗拉强度为350~400MPa、延伸率≥35.0%、n90≥0.18、r90≥1.5,并且成形性能优良。
本发明提供一种热镀锌钢板,其化学成分为:按重量百分比计,C:0.001~0.005%,Si:0.06~0.14%,Mn:0.25~0.50%,P:0.025~0.060%,S:≤0.015%,Als:0.015~0.060%,Nb:0.015~0.045%,Ti:0.010~0.060%,B:0.0005~0.0020%,余量为Fe和不可避免的杂质。
其中,上述热镀锌钢板中,屈服强度为220~260MPa、抗拉强度为350~400MPa、延伸率≥35.0%、n90≥0.18、r90≥1.5。
本发明还提供了一种上述热镀锌钢板的制备方法,包括以下步骤:
将冶炼钢水经冶炼-热轧-酸轧-热镀锌-退火工序后,得到热镀锌钢板;所述热轧包括加热、除磷、粗轧、精轧、层流冷却和卷取工序。
其中,上述热镀锌钢板的制备方法中,所述热轧中精轧开轧温度为1100~1250℃,终轧温度为890~960℃。
其中,上述热镀锌钢板的制备方法中,所述热轧中卷取温度为700~780℃。
其中,上述热镀锌钢板的制备方法中,所述酸轧工序中冷轧压下率为50~80%。
其中,上述热镀锌钢板的制备方法中,所述退火工序具体为:从800~880℃以10~50℃/s的速度冷却至440~470℃,镀锌7~30s,再以5~10℃/s的速度终冷至室温。
其中,上述热镀锌钢板的制备方法中,炉内保护气氛露点温度为-25~-60℃。
与现有技术相比,本发明的有益效果为:
本发明提供了一种热镀锌钢板,通过严格控制C、N等间隙原子以保证钢质纯净,同时添加适宜量的Ti、Nb等固溶强化元素,结合特有的轧制及连续退火热镀锌工艺,制备得到一种表面质量优良、成形性能优异的热镀锌钢板。该钢板的屈服强度为220~260MPa、抗拉强度为350~400MPa、延伸率≥35.0%、n90≥0.18、r90≥1.5,能够满足汽车外板用户使用要求,开发了一种新的汽车用热镀锌钢板。
具体实施方式
本发明提供一种热镀锌钢板,其化学成分为:按重量百分比计,C:0.001~0.005%,Si:0.06~0.14%,Mn:0.25~0.50%,P:0.025~0.060%,S:≤0.015%,Als:0.015~0.060%,Nb:0.015~0.045%,Ti:0.010~0.060%,B:0.0005~0.0020%,余量为Fe和不可避免的杂质。
在本发明的热镀锌钢板中,同时含有铌(Nb)、钛(Ti)和硼(B)三种合金成分,铌能细化晶粒,抑制晶粒的过分长大,可以提高钢的强度。但铌的含量不宜过高,过高后强度过高,延伸率和r90值会降低,无法达到性能要求,且用户使用过程很可能出现冲压开裂,并且由于铌的成本高,含量过高会增加生产成本。因此,本发明的热镀锌钢板中铌含量以0.015~0.045%为宜。
本发明热镀锌钢板中还含有钛,能够固定钢种的C,N间隙原子,使钢质纯净,但钛含量过高时虽会提高强度,但也会导致延伸率和r90值降低。因此,本发明中钛的适宜含量为Ti:0.010~0.060%。
特别的,本发明的热镀锌钢板中还含有0.0005~0.0020%的硼,进一步提高钢的强度。
上述热镀锌钢板中,除特别的含有铌、钛和硼以外,锰含量也较普通的热镀锌钢板更高,锰能够增强钢板的抗拉强度,本发明为了得到抗拉强度350~400MPa的钢板,钢板中锰含量为0.25~0.50%。
其中,上述热镀锌钢板中,屈服强度为220~260MPa、抗拉强度为350~400MPa、延伸率≥35.0%、n90≥0.18、r90≥1.5。
本发明还提供了一种上述热镀锌钢板的制备方法,包括以下步骤:
将冶炼钢水经冶炼-热轧-酸轧-热镀锌-退火工序后,得到热镀锌钢板;所述热轧包括加热、除磷、粗轧、精轧、层流冷却和卷取工序。
其中,上述热镀锌钢板的制备方法中,为了防止热轧工序产生翘皮缺陷,同时保证高温卷取的温度,所述热轧中精轧开轧温度为1100~1250℃,终轧温度为890~960℃。
其中,上述热镀锌钢板的制备方法中,为了热轧工序得到细小均匀的铁素体组织以及粗大的析出物,本发明卷曲温度高,所述热轧中卷取温度为700~780℃。
其中,上述热镀锌钢板的制备方法中,所述酸轧工序中冷轧压下率为50~80%。
其中,上述热镀锌钢板的制备方法中,所述退火工序具体为:从800~880℃以10~50℃/s的速度冷却至440~470℃,镀锌7~30s,再以5~10℃/s的速度终冷至室温。
其中,上述热镀锌钢板的制备方法中,炉内保护气氛露点温度为-25~-60℃。
下面将通过实施例对本发明的具体实施方式做进一步的解释说明,但不表示将本发明的保护范围限制在实施例所述范围内。
实施例1-3用本发明方法制备热镀锌钢板
具体操作步骤如下:
(1)经过普通的冶炼工艺,制备得到如下表1所示化学成分的钢板坯:
表1热镀锌钢板化学成分(wt.%)
编号 | C | Si | Mn | P | S | Als | Nb | Ti | B |
1 | 0.0016 | 0.08 | 0.35 | 0.038 | 0.005 | 0.026 | 0.028 | 0.035 | 0.0007 |
2 | 0.0038 | 0.10 | 0.44 | 0.047 | 0.010 | 0.037 | 0.030 | 0.043 | 0.0010 |
3 | 0.0025 | 0.11 | 0.39 | 0.042 | 0.007 | 0.044 | 0.035 | 0.039 | 0.0008 |
(2)将上述板坯经过加热、除磷、热轧和层流冷却后获得热轧卷,其中各参数设置为下表2所示:
表2热轧主要工艺参数
(3)将热轧卷酸洗后,冷轧成薄带钢,其中1#、2#和3#的冷轧压下率分别为77.1%、76.0%和72.4%。
(4)对步骤(3)中得到的薄带钢进行热镀锌、退火,热镀锌退火工艺参数如表3所示:
表3热镀锌退火主要工艺参数
编号 | 退火温度/℃ | 快冷速率/℃/s | 镀锌时间/s | 终冷速率/℃/s |
1 | 826 | 30 | 10 | 4.0 |
2 | 853 | 35 | 15 | 7.5 |
3 | 875 | 45 | 25 | 8.5 |
(5)经上述工艺制备的烘烤硬化热镀锌钢板,其力学性能如下表4所示:
表4烘烤硬化热镀锌钢板力学性能
由实施例1-3的结果可知:本发明制备的热镀锌钢板具有良好的力学性能,其屈服强度为220~260MPa、抗拉强度为350~400MPa、延伸率≥35.0%、n90≥0.18、r90≥1.5,能够满足汽车外板用户使用要求。本发明提供了一种全新的热镀锌钢板,其性能优异,成本低廉,具有明显的经济效益。
Claims (8)
1.热镀锌钢板,其特征在于,其化学成分为:按重量百分比计,C:0.001~0.005%,Si:0.06~0.14%,Mn:0.25~0.50%,P:0.025~0.060%,S:≤0.015%,Als:0.015~0.060%,Nb:0.015~0.045%,Ti:0.010~0.060%,B:0.0005~0.0020%,余量为Fe和不可避免的杂质。
2.根据权利要求1所述的热镀锌钢板,其特征在于:所述热镀锌钢板屈服强度为220~260MPa、抗拉强度为350~400MPa、延伸率≥35.0%、n90≥0.18、r90≥1.5。
3.权利要求1或2所述的热镀锌钢板的制备方法,其特征在于,包括以下步骤:
将冶炼钢水经冶炼-热轧-酸轧-热镀锌-退火工序后,得到热镀锌钢板;所述热轧包括加热、除磷、粗轧、精轧、层流冷却和卷取工序。
4.根据权利要求3所述的热镀锌钢板的制备方法,其特征在于:所述热轧中精轧开轧温度为1100~1250℃,终轧温度为890~960℃。
5.根据权利要求3所述的热镀锌钢板的制备方法,其特征在于:所述热轧中卷取温度为700~780℃。
6.根据权利要求3所述的热镀锌钢板的制备方法,其特征在于:所述酸轧工序中冷轧压下率为50~80%。
7.根据权利要求3所述的热镀锌钢板的制备方法,其特征在于:所述退火工序具体为:从800~880℃以10~50℃/s的速度冷却至440~470℃,镀锌7~30s,再以5~10℃/s的速度终冷至室温。
8.根据权利要求3所述的热镀锌钢板的制备方法,其特征在于:所述的热镀锌时炉内保护气氛露点温度为-25~-60℃。
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CN112159926A (zh) * | 2020-09-16 | 2021-01-01 | 马鞍山钢铁股份有限公司 | 一种经济型优良综合力学性能热镀锌汽车外板用钢及其生产方法 |
CN114438417A (zh) * | 2022-02-09 | 2022-05-06 | 马鞍山钢铁股份有限公司 | 具有良好抗脱锌粉性能及表面质量的纯锌镀层钢板及其生产方法和应用 |
CN114438417B (zh) * | 2022-02-09 | 2023-02-28 | 马鞍山钢铁股份有限公司 | 具有良好抗脱锌粉性能及表面质量的纯锌镀层钢板及其生产方法和应用 |
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