The invention belongs to the technical field of steel plate manufacturing, in particular to a hot galvanized steel plate and a preparation method. According to the mechanical performance of galvanized steel sheet prepared by the conventional method, the poor performance is not good extension and other issues, the present invention provides a hot dip galvanized steel sheet and its preparation method, chemical composition of the invention is: hot galvanized steel plate according to the weight percentage of C:0.04 ~ 0.08%, Si:0.01 ~ 0.04%, Mn:0.10 ~ 0.40%, P = 0.020% S: = 0.015%, Als:0.015 ~ 0.050%, B:0.0010 ~ 0.0040% margin Fe and inevitable impurities. The preparation method is that the molten steel smelting by hot rolling acid hot galvanizing annealing process, get hot galvanized steel plate. Hot galvanized steel plate prepared by the invention of the yield strength is 220 ~ 250MPa, the tensile strength is 320 ~ 380MPa, the elongation is greater than or equal to 36%, N90 = 0.18, r90 = 1.5, BH = 30MPa, the mechanical properties and forming excellent performance, can meet the user requirements of automobile outer panel.
【技术实现步骤摘要】
优良成形的烘烤硬化热镀锌钢板及其制备方法
本专利技术属于热镀锌钢板生产
,具体涉及一种优良成形的烘烤硬化热镀锌钢板及其制备方法。
技术介绍
烘烤硬化热镀锌钢板广泛应用于汽车零件,不仅要求具有优良的冲压成形性能及表面外观质量,同时还要求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。有关烘烤硬化钢板的生产技术有:CN103228808B提供了一种烘烤硬化性、常温时效性以及深拉深加工性优异、且面内各向异性小的高强度烘烤硬化型冷轧钢板,成分由C:0.0010~0.0040%、Si:0.005~0.05%、Mn:0.1~0.8%,P:0.01~0.07%、S:0.001~0.01%、Al:0.01~0.08%、N:0.0010~0.0050%、Nb:0.002~0.020%以及Mo:0.005~0.050%,[Mn%]/[P%]为1.6以上且45以下,由[C%]-(12/93)×[Nb%]求得的固溶C的量为0.0005%以上且0.0025%以下,通过对X(222)/{X(110)+X(200)}≥3.0织构控制,可获得低各向异性、抗拉强度在300~450MPa的烘烤硬化冷轧钢板。该专利技术加P、Nb、Mo等合金元素,合金成分较高,同时对各C、N、Mn、P、Nb等元素具有关联控制要求,实际冶炼控制难度大。CN1090246C提供了一种烘烤硬化性优良的冷轧钢板,包括含Ti和/或Nb的极低碳钢,以及含特定量B的烘烤硬化钢,其成分为C:0.0013~0.0070%、Si:0.001~0.08%、Mn:0.01~0.9%,P:0.01~0.10%、S:0.0 ...
【技术保护点】
优良成形的烘烤硬化热镀锌钢板,其特征在于,化学成分为:C:0.04~0.08%,Si:0.01~0.04%,Mn:0.10~0.40%,P:≤0.020%,S:≤0.015%,Als:0.015~0.050%,B:0.0010~0.0040%余量为Fe和不可避免杂质。
【技术特征摘要】
1.优良成形的烘烤硬化热镀锌钢板,其特征在于,化学成分为:C:0.04~0.08%,Si:0.01~0.04%,Mn:0.10~0.40%,P:≤0.020%,S:≤0.015%,Als:0.015~0.050%,B:0.0010~0.0040%余量为Fe和不可避免杂质。2.根据权利要求1所述的优良成形的烘烤硬化热镀锌钢板,其特征在于:热镀锌钢板的屈服强度为220~250MPa、抗拉强度为320~380MPa、延伸率≥36.0%、n90≥0.18、r90≥1.5、BH≥30MPa。3.权利要求1或2所述的优良成形的烘烤硬化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...
【专利技术属性】
技术研发人员:王敏莉,郑之旺,邝春福,张功庭,
申请(专利权)人:攀钢集团攀枝花钢铁研究院有限公司,
类型:发明
国别省市:四川,51
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