Transactions of Materials and Heat Treatment

Title：Numerical simulation and trail production of backward extrusion billet making and hot extrusion forming process for P92 steel pipe

Authors： Liu Haijiang1 Wang Yingying1 Sun Shuli2 Liu Pengfei1 Wang Xing1 Wang Le1

Unit： 1. Inner Mongolia North Heavy Industries Group Corp. Ltd. 2. College of Materials Science and Engineering Taiyuan University of Science and Technology

KeyWords： P92 steel pipe backward extrusion forward extrusion hot extrusion temperature grain size

ClassificationCode：TG316

year,vol(issue):pagenumber：2025,50(3):248-254

Abstract：

Based on the Gleeble-3500 thermal simulation experimental platform, the true stress-true strain curves of P92 steel were tested under different deformation temperatures and strain rates, and the dynamic recrystallization and grain growth models were obtained. Numerical simulations were conducted on the backward extrusion billet making and forward extrusion forgming process of P92 steel pipes using the Deform software. Results indicate that the maximum value of equivalent strain during the piercing process for billet making is distributed at the contact area between punch circumference and billet, a lower temperature zone is formed on the contact surface between billet and lower end of piercing plug. With the diversion angle gradually increasing from 20° to 50° during the forward extrusion process, the maximum equivalent strain inside the billet is gradually decreased and moved from the inside of billet to the contact area between billet surface and die, and the shear stress inside the billet is gradually eliminated. For P92 steel pipes extrudet at the three typical hot extrusion temperatures of 1100 , 1200 and 1300 ℃, the higher the hot extrusion temperature, the more obvious the grain size refinement.

Funds：

作者简介：刘海江（1979-），男，硕士，正高级工程师 E-mail：13848522181@163.com 通信作者：王莹莹（1982-），女，硕士，高级工程师 E-mail：yy1257@qq.com

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