Steel for automobile engine connecting rod as well as manufacturing method thereof

• Main Authors: LIU NIANFU, ZUO WENRUI, ZHONG FANGHUA, ZHOU CHENGHONG
• Format: Patent
• Language: Chinese; English
• Published: 18.10.2019
• 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; 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 provides steel for an automobile engine connecting rod as well as a manufacturing method thereof. The steel for the connecting rod comprises the following components in percentage by weight: 0.32 to 0.40 percent of C, 0.40 to 0.70 percent of Si, 0.80 to 0.95 percent of Mn, 0.025 to 0.040 percent of S, 0.030 to 0.045 percent of P, 0.10 to 0.25 percent of Cr, less than 0.10 percent ofMo, 0.08 to 0.20 percent of Nb, 0.015 to 0.035 percent of Ti, less than or equal to 0.10 percent of Ni, 0.012 to 0.020 percent of N, less than or equal to 15*10<-6> of O and the balance of Fe and unavoidable impurities. The manufacturing method comprises the steps of performing converter smelting, performing external refining, performing continuous casting, performing casting blank slow cooling aswell as heating and rolling. The steel for the connecting rod as well as the manufacturing method thereof can guarantee that the tensile strength is more than 1000 MPa, the yield strength is more than 700 MPa and sulfide incl