Process for reducing cracks of 50Mn18Cr5 retaining ring forge piece

• Main Authors: HUANG ZHI, LI ZHUMAO, SONG LEIJUN
• Format: Patent
• Language: Chinese; English
• Published: 25.01.2022
• Subjects: CHEMISTRY; FORGE FURNACES; FORGING; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; HAMMERING; 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; PRESSING METAL; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; PUNCHING METAL; RIVETING; TRANSPORTING; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS

The invention relates to a technology for reducing cracks of a 50Mn18Cr5 retaining ring forge piece. The technology comprises the following steps that 1, the forge piece is smelted in an intermediate frequency furnace and subjected to vacuum degassing treatment; 2, solid solution heat treatment and water cooling are carried out; 3, recrystallization annealing treatment is performed; 4, machining and forging are carried out; 5, quenching and high-temperature tempering are carried out for hardening and tempering; and low-temperature tempering is carried out. According to the method, the oxygen content is reduced through vacuum degassing treatment, generation of subsurface bubbles of a steel ingot in a bottom pouring method is reduced, a normalizing process before forging in conventional process production is replaced with a recrystallization annealing process, the structure state of the forge piece is improved, the mixed crystal structure phenomenon caused by rapid cooling of the forge piece is avoided, and the