STEEL FOR BALL-CAGE TYPE UNIVERSAL JOINT RETAINER AND PRODUCTION METHOD THEREFOR

• Main Authors: CHEN, Min, WU, Xiaolin, LI, Wenbin, BAI, Yun, LUO, Yuandong, YIN, Qing, HUA, Liukai, LIU, Ye
• Format: Patent
• Language: English; French; German
• Published: 31.05.2023
• 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; 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 present invention belongs to the technical field of special steel smelting, and relates to a steel for a cage of a ball-cage universal joint and a production method therefor. The steel comprises the following chemical ingredients by wt%: 0.10-0.25% of C, 0.20-0.40% of Si, 0.40-0.65% of Mn, 0.40-0.70% of Cr, 0.0003-0.0025% of B, 0.010-0.035% of Ti, 0.30-0.45% of Mo, 0.0050-0.0100% of N, ≤0.015% of S, ≤0.025% of P, ≤0.25% of Ni, ≤0.30% of Cu, 0.015-0.035% of Al, ≤0.0010% of O, ≤ 0.04% of As, ≤ 0.03% of Sn, ≤0.005% of Sb, ≤0.002% of Pb, and the balance being Fe and unavoidable impurities. The microstructure of the steel is bainite, and the grain size of austenite G≥6. The production process comprises primary smelting of molten steel, refining of molten steel, vacuum degassing of molten steel, continuous casting, hot rolling and finishing. In the present application, the chemical ingredients are optimized, and the alloy costs are reduced. Furthermore, a hardenability similar to that of 20CrMnTi is achieved, the strength and toughness of the steel, manufactured by using the chemical ingredients combined with the production method, are better than the strength and toughness of 20CrMnTi, and the comprehensive performance meets the requirements of the steel for the cage of the ball-cage type universal joint.