Galvanized dual-phase steel with enhanced formability and production method thereof

• Main Authors: KUANG SHUANG, ZHANG JINGYU, TIAN XIUGANG, YU YANGANG, LI YANG, WANG SHUHUA, WANG CHAO, YANG FENG, CHI YONGQING
• Format: Patent
• Language: Chinese; English
• Published: 28.06.2024
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses galvanized reinforced formability dual-phase steel and a production method thereof. The dual-phase steel comprises the following chemical components in percentage by mass: 0.17%-0.25% of C, 1.50%-2.70% of Mn, less than or equal to 0.005% of S, less than or equal to 0.020% of P, 0.20%-1.00% of Si, 0.20%-1.20% of Als, 0.02%-0.080% of Nb, 0.20%-1.00% of Cr and the balance of Fe and unremovable impurities. The production method comprises the procedures of continuous casting, heating, hot rolling, cold rolling, continuous annealing, hot galvanizing and finishing. The structure of the dual-phase steel is ferrite, martensite and retained austenite, the yield strength is Rp0.2: 550-750 MPa, the tensile strength is larger than or equal to 980 MPa, the percentage elongation after fracture A80 is larger than or equal to 15%, and the cold forming performance is good. 本发明公开一种镀锌增强成型性双相钢及其生产方法，所述双相钢化学成分组成及其质量百分含量为：C：0.17～0.25%，Mn：1.50～2.70%，S≤0.005%，P≤0.020%，Si：0.20～1.00%，Als：0.20～1.20%，Nb：0.02～0.080