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首页> 外国专利> HIGH STRENGTH HOT-ROLLED STEEL PLATE EXHIBITING EXCELLENT ACID PICKLING PROPERTY, CHEMICAL CONVERSION PROCESSABILITY, FATIGUE PROPERTY, STRETCH FLANGEABILITY, AND RESISTANCE TO SURFACE DETERIORATION DURING MOLDING, AND HAVING ISOTROPIC STRENGTH AND DUCTILITY, AND METHOD FOR PRODUCING SAID HIGH STRENGTH HOT-ROLLED STEEL PLATE

HIGH STRENGTH HOT-ROLLED STEEL PLATE EXHIBITING EXCELLENT ACID PICKLING PROPERTY, CHEMICAL CONVERSION PROCESSABILITY, FATIGUE PROPERTY, STRETCH FLANGEABILITY, AND RESISTANCE TO SURFACE DETERIORATION DURING MOLDING, AND HAVING ISOTROPIC STRENGTH AND DUCTILITY, AND METHOD FOR PRODUCING SAID HIGH STRENGTH HOT-ROLLED STEEL PLATE

机译：高强度热轧钢板，具有出色的酸洗性，化学转化性，疲劳性，拉伸易损性和模制过程中的耐表面变质性，并且具有持久的抗弯强度和强度

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This high strength hot-rolled steel sheet includes: in terms of percent by mass, C: 0.05 to 0.12%; Si: 0.8 to 1.2%; Mn: 1.6 to 2.2%; Al: 0.30 to 0.6%; P: 0.05% or less; S: 0.005% or less; and N: 0.01% or less, with the remainder being Fe and unavoidable impurities, wherein a microstructure includes: 60 area% or more of ferrite phases; more than 10 area% of martensite phases; and 0 to less than 1 area% of residual austenite phases, or the microstructure includes: 60 area% or more of ferrite phases; more than 10 area% of martensite phases; less than 5 area% of bainite phases; and 0 to less than 1% of residual austenite phases, and a maximum concentration of Al detected by a glow discharge emission spectroscopic analysis is in a range of 0.75 mass% or less in a region from a surface of the steel sheet to a thickness of 500 nm after being acid-pickled.
机译：该高强度热轧钢板含有：C：质量％：0.05〜0.12％; C：0.05〜0.12％。 Si：0.8〜1.2％; Mn：1.6〜2.2％。 Al：0.30〜0.6％; Al：0.30〜0.6％。 P：0.05％以下。 S：0.005％以下。 N：0.01％以下，其余为Fe和不可避免的杂质，其中，显微组织包括：60面积％以上的铁素体相。马氏体相占面积的10％以上;残余奥氏体相为0〜不足1面积％，或者组织为：60面积％以上的铁素体相。马氏体相占面积的10％以上;少于贝氏体相的5面积％;残余奥氏体相为0〜1％以下，通过辉光放电发射光谱分析法检测出的Al的最大浓度在从钢板的表面到厚度的区域为0.75质量％以下。酸洗后500 nm。

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