The invention belongs to the technical field of the production of hot - plated aluminum zinc plate, in particular to a hot - plated aluminum zinc plate for 550Mpa - grade structure and a preparation method. Aiming at the problems of more alloying elements, subsequent preparation difficulties, high equipment requirements and high production cost when the existing hot dip aluminized zinc coated steel sheets are prepared, the invention provides a 550Mpa grade structure hot dip Al Zn steel plate and a preparation method thereof. The chemical composition of hot galvanized steel is C 0.02% ~ 0.07%, Si 0.03%, Mn 0.15% ~ 0.30%, P = 0.020%, S = 0.020%, Nb 0.015 ~ 0.035%, 0.020 ~ 0.070% Als, residual Fe and inevitable impurities. The preparation method is cold rolling with low cold rolling reduction rate of 55 ~ 65%. The steel plate obtained by the invention has excellent mechanical properties, the yield strength is above 550MPa, the tensile strength is above 560MPa, and the elongation of A80 is about 10%. The preparation method of the heat plating aluminum zinc plate of the invention is simple, the production cost is low, and it has important economic benefit.
【技术实现步骤摘要】
550Mpa级结构用热镀铝锌钢板及其制备方法
本专利技术属于热镀铝锌钢板生产
,具体涉及一种550Mpa级结构用热镀铝锌钢板及其制备方法。
技术介绍
近年来,随着节能减排、降低能耗、提高产品稳定安全性的不断要求,建筑结构用热镀铝锌板也向高强度、高表面质量发展,我国铝锌镀层结构钢板可直接应用或彩涂后应用于建筑行业,如瓦楞板、轻钢结构房等。专利CN102363857B公开了一种屈服强度≥550MPa的结构用彩涂板的生产方法,其化学成分百分比为:C:0.03~0.05%;Si≤0.02%;Mn:0.15~0.25%;P≤0.015%;S≤0.012%;Als:0.02~0.06%;N≤0.005%;Ti:≤0.005%;Nb:≤0.045%,其余为Fe和杂质;通过600~630℃退火,保温20~60秒后,进行热镀铝锌,得到屈服强度550~600MPa,抗拉强度560~610MPa,伸长率A80≥6%的铝锌镀层结构用彩涂钢板。尽管通过上述方法制备的铝锌镀层结构钢板力学性能优良,但由于需要添加大量的Ti和Nb,合金成本高,冶炼难度大。专利CN105063484A公开了一种屈服强度500MPa级高延伸率热镀铝锌及彩涂钢板及其制造方法,其化学成分百分比为:C:0.07~0.15%;Si:0.02~0.15%;Mn:1.3~1.8%;P≤0.035%;S≤0.035%;Al:0.02~0.06%;Nb+Ti≤0.0080%,其余为Fe和杂质;通过800~900℃终轧,500~650℃卷取,冷轧压下率为70%~80%,经过750~840℃均热后,热镀铝锌得到屈服强度5 ...
【技术保护点】
550Mpa级结构用热镀铝锌钢板,其特征在于,其化学成分为:按重量百分比计,C 0.02%~0.07%,Si≤0.03%,Mn 0.15%~0.30%,P≤0.020%,S≤0.020%,Nb 0.015~0.035%,Als 0.020~0.070%,余量为Fe和不可避免杂质。
【技术特征摘要】
1.550Mpa级结构用热镀铝锌钢板,其特征在于,其化学成分为:按重量百分比计,C0.02%~0.07%,Si≤0.03%,Mn0.15%~0.30%,P≤0.020%,S≤0.020%,Nb0.015~0.035%,Als0.020~0.070%,余量为Fe和不可避免杂质。2.权利要求1所述的550Mpa级结构用热镀铝锌钢板的制备方法,其特征在于,包括以下步骤:a、钢水冶炼将钢水脱硫后注入转炉中冶炼,得到冶炼钢板;b、热轧卷取将步骤a得到的钢板进行热轧,热轧时粗轧温度为1230~1280℃,终轧温度为840~880℃;终轧后在温度630~670℃下进行卷取;c、酸轧将步骤b卷曲的钢卷进行酸洗,酸洗后冷轧成冷轧薄带钢;d、镀铝锌退火将步骤c得到的薄带钢镀铝锌,退火,得到热镀铝锌钢板。3.根据权利要求2所述的550Mpa级结构用热镀铝锌钢板的制备方...
【专利技术属性】
技术研发人员:郑昊青,许哲峰,郑之旺,徐信,
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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