High-strength and high-toughness gear steel capable of being used for induction hardening and manufacturing method thereof

• Main Authors: ZHANG XUECHENG, LU MINGXIA, WU XIAOLIN, XIANG YANG, WANG DONG, SUN HONGPING, LIM HO, CAO HONGFU, ZHU YUNHAI, BAI YUN
• Format: Patent
• Language: Chinese; English
• Published: 11.11.2022
• Subjects: ALLOYS; CASTING; CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES; 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; PERFORMING OPERATIONS; POWDER METALLURGY; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; TRANSPORTING; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention relates to high-strength high-toughness gear steel capable of being used for induction hardening and a manufacturing method thereof, the metallographic structure is ferrite and pearlite, the pearlite accounts for 70%-85%, and the chemical components comprise, by weight, 0.40%-0.50% of C, 1.00%-1.30% of Si, 0.65%-0.90% of Mn, 0.65%-0.90% of Cr, 0.15%-0.25% of Ni, smaller than or equal to 0.015% of P, smaller than or equal to 0.005% of S, smaller than or equal to 0.015% of Al, smaller than or equal to 0.10% of Cu, smaller than or equal to 0.05% of Mo and the balance Fe and inevitable impurities. The hot rolling hardness of the steel is smaller than or equal to 210 HBW. The tensile strength of the steel subjected to induction quenching and tempering treatment is 1150-1320MPa, the yield strength is greater than or equal to 950MPa, the ductility is greater than or equal to 12%, the percentage reduction of area is greater than or equal to 50%, and the Charpy impact energy KU2 at normal temperature is