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首页> 外国专利> HIGH-STRENGTH HOT-ROLLED STEEL SHEET HAVING EXCELLENT CORROSION RESISTANCE OF COATING AND BENDING FATIGUE CHARACTERISTIC, AND METHOD FOR PRODUCING THE SAME

HIGH-STRENGTH HOT-ROLLED STEEL SHEET HAVING EXCELLENT CORROSION RESISTANCE OF COATING AND BENDING FATIGUE CHARACTERISTIC, AND METHOD FOR PRODUCING THE SAME

机译：具有优异的镀层和弯曲疲劳特性的高强度热轧钢板及其制造方法

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PROBLEM TO BE SOLVED: To provide a high-strength hot-rolled steel sheet having excellent corrosion resistance of coating and bending fatigue characteristics, which has excellent corrosion resistance after coating even when coating on either surface of a surface with mill scale (with scale) or a surface from which the scale is removed, and further allows control on generation of a decarburized layer on a ferrite surface, the cause of failure of bending fatigue characteristics, in steel with high content of Si and Al, and to provide a method for producing the same.;SOLUTION: The high-strength hot-rolled steel sheet has component composition containing, in mass%, 0.05-0.25% of C, the total content of Si and Al of 0.8-2.0%, 1.0-4.0% of Mn, the total content of one or two of Ti and Nb of 0.05-0.2%, 0.0003-0.01% of N, 0.001-0.2% of P, and 0.01% or less of S, with the balance comprising Fe and unavoidable impurities, wherein the thickness of the decarburized layer on the ferrite surface is 5 μm or less, average roughness Ra of the ferrite surface is 2.0 μm or less, and the maximum tensile strength is 540 MPa or more.;COPYRIGHT: (C)2013,JPO&INPIT
机译：解决的问题：提供一种高强度的热轧钢板，该钢板具有优异的镀层耐蚀性和弯曲疲劳特性，即使在轧制氧化皮（带氧化皮）的任一表面上进行镀覆后，也具有优异的耐蚀性。 Si或Al含量高的钢中，还可以控制铁素体表面上的脱碳层的产生，弯曲疲劳特性失效的原因，或者提供一种用于去除铁锈表面的方法。解决方案：高强度热轧钢板的成分组成以质量％计包含0.05-0.25％的C，Si和Al的总含量为0.8-2.0％，C的1.0-4.0％ Mn，Ti和Nb中的一种或两种的总含量为0.05-0.2％，N 0.0003-0.01％，P 0.001-0.2％和S的0.01％以下，其余部分包含Fe和不可避免的杂质，其中铁素体表面上的脱碳层的厚度为5 μm以下，铁素体表面的平均粗糙度Ra为2.0μm以下，最大抗拉强度为540 MPa以上。;版权所有（C）2013，JPO＆INPIT

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