Preparation method of high-temperature alloy bar billet for thermal power generating unit valve

• Main Authors: FU BAOQUAN, YUAN YONG, DANG YINGYING, SHI XINBO, WANG DONGWEI, ZHANG LIXIANG, SUN MINGYU, CAO GUOXIN, HE YONGSHENG, YAN JINGBO
• Format: Patent
• Language: Chinese; English
• Published: 14.11.2023
• 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; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses a preparation method of a high-temperature alloy bar billet for a thermal power generating unit valve, which is characterized by comprising the following steps: S1, selecting a bar billet of which the specification is phi 90mm, the carbide rating is less than or equal to grade 2 and the grain size is more than or equal to grade 3, and carrying out double-vacuum smelting of vacuum induction smelting and vacuum consumable remelting to obtain a cast ingot with the diameter of 490mm; s2, carrying out high-temperature homogenization heat treatment on the cast ingot in a natural gas furnace; s3, the cast ingot subjected to homogenizing heat treatment is subjected to three-heating-number blooming forging in an 80MN fast forging machine, blooming is continuous remelting, and the deformation amount of each heating number ranges from 30% to 50%; s4, the cogged blank is subjected to two-heating-number continuous remelting low-temperature drawing in an 80MN fast forging machine, and the deformatio