Medium-carbon carbon steel for automobile front axle and preparation method of medium-carbon carbon steel

• Main Authors: JU YINJUN, WANG XUJI, ZHANG JIE, PAN XIQUAN, YANG GENGCHAO, ZENG FANZHENG, CHEN JUN, LUO JINGXIAN
• Format: Patent
• Language: Chinese; English
• Published: 09.04.2024
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; METALLURGY OF IRON; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses medium-carbon carbon steel for an automobile front axle and a production method of the medium-carbon carbon steel. The medium carbon steel for the automobile front axle comprises the following components in percentage by weight: 0.46 to 0.50 percent of C, 0.22 to 0.30 percent of Si, 0.75 to 0.80 percent of Mn, 0.20 to 0.25 percent of Cr, 0.020 to 0.050 percent of Al, less than or equal to 0.017 percent of P, less than or equal to 0.010 percent of S, 0.0015 to 0.0035 percent of B, 0.025 to 0.045 percent of Ti and the balance of Fe and inevitable impurities. The medium carbon automobile front axle steel is suitable for manufacturing automobile front axle steel with the round steel diameter of 80-100 mm, and has high strength, high toughness and high hardenability, the KU2 impact toughness value at the normal temperature is larger than or equal to 47 J, the end quenching value J1.5 is 54-60 HRC, the end quenching value J9 is 40-50 HRC, the tensile strength after heat treatment is larger t