Heat treatment for G115 large diameter pipe fittings

doi:10.13251/j.issn.0254-6051.2021.03.018

Abstract

Abstract: The orthogonal test method was used to analyze the effects of heat treatment parameters (normalizing temperature, normalizing time, tempering temperature, and tempering time) on the properties of G115 steel, and the heat treatment process of G115 steel large diameter pipe fittings was studied by thermal simulation of hot pressed tee. The results show that the tempering temperature has the greatest comprehensive influence on the tensile strength, hardness and impact performance of the G115 steel. When the tempering temperature is 780 ℃, the strength and hardness are maintained at a higher level, and the impact performance is better. The recommended heat treatment process parameters for G115 steel large diameter pipe fittings are: normalizing temperature 1070-1090 ℃, holding time 1-2 min/mm and not less than 1.5 h; tempering temperature 770-790 ℃, holding time 3.5-5 min/mm and not less than 4 h. After the recommended process treatment, the properties of G115 steel large diameter pipe fittings meet the requirements of T/CSTM 00017-2017 standard.

Key words: G115 steel, large diameter pipe fittings, heat treatment, orthogonal test

CLC Number:

TG162.8

Cong Xiangzhou, Peng Xingna, Peng Xiankuan, Wang Tao, Chen Zhengzong, Jiang Haifeng, Li Chuanyong, Zhang Shuying. Heat treatment for G115 large diameter pipe fittings[J]. Heat Treatment of Metals, 2021, 46(3): 90-95.

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