Transactions of Materials and Heat Treatment

Title：Forging process for austenitic stainless steel valve body

Authors： Sun Changbo Dong Chao Zhang Sufang Qin Hongfu Guo Haoyang Ding Keqiang Li Xue Hua Luming

Unit： 1.LuoYang CITIC HIC Casting & Forging Co. Ltd. 2.State Key Laboratory of Intelligent Mining Heavy Equipment 3. CITIC Heavy Industries Co. Ltd.

KeyWords： 316L austenitic stainless steel coarse grains mixed grains dynamic recrystallization ultrasonic testing forging process

ClassificationCode：TG316.2

year,vol(issue):pagenumber：2025,50(7):50-56

Abstract：

To address the issue of grass-like echo defects in ultrasonic testing for large 316L austenitic stainless steel forgings, it was determined that the grass-like echo defects in ultrasonic testing were caused by mixed grains and coarse grains in the forgings through cross-sectional sampling and metallographic analysis of the valve body forgings exhibiting grass-like echo defects. Based on the mechanisms of dynamic recrystallization during forging and grain static growth mechanism, an optimized forging process was proposed based on the original process. By reducing the forging heating temperature, shortening the heating and holding time, increasing the forging deformation and improving deformation uniformity, and controlling the final forging temperature below the phase transformation temperature, the internal forging penetration was enhanced, the microstructural differentiation was reduced, and the issues of coarse grains and mixed grains in the forgings were effectively mitigated. Consequently, the challenge of grass-like echo defects in ultrasonic testing for large 316L austenitic stainless steel forgings was successfully resolved.

Funds：

河南省重点研发专项（231111230400）

作者简介：孙长波（1985-），男，学士，工程师 E-mail：suuchangbo@126.com 通信作者：董超（1993-），男，硕士 E-mail：1258324985@qq.com

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