Hot rolled steel strip suitable for direct hot charging production and used for automobile structure and preparation method of hot rolled steel strip

• Main Authors: TANG XIAOYONG, NI XIN, ZHANG BORUI, XU YONGHENG, ZHOU YANJUAN, YANG SUOBING, LI ZHIWEI, OUYANG WEI
• Format: Patent
• Language: Chinese; English
• Published: 12.05.2023
• 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; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; PUNCHING METAL; ROLLING OF METAL; TRANSPORTING; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention provides a hot-rolled steel strip for an automobile structure suitable for direct hot charging production and a preparation method of the hot-rolled steel strip, and the hot-rolled steel strip comprises the following components in percentage by weight: 0.05-0.09% of C; 0.05%-0.15% of Si; 0.40% to 0.60% of Mn; 0 to 0.010 percent of S; 0 to 0.025 percent of P; 0.010% to 0.050% of Alt; 0 to 0.050 percent of Nb, Ti and V; 0-0.5% of impurities and the balance of Fe; the preparation method comprises the steps of primary smelting, primary alloying, refining, continuous casting, direct charging and hot delivery or hot charging and hot delivery and rolling. The preparation method of the hot rolled steel strip suitable for direct hot charging production and used for the automobile structure is high in operability, good in controllability and easy for industrial production, adopts a direct hot charging production process, is relatively high in production efficiency and relatively low in production cost, an