Transactions of Materials and Heat Treatment

Title：Study on heat treatment and microstructure and properties of 1Cr16Ni4Mo2N stainless steel for high-strength pipeline

Authors： Su Ning1 Liu Fengjun1 Li Yuechao2

Unit： 1. China Petroleum Pipeline Engineering Co. Ltd. 2. Henan University of Science and Technology

KeyWords： aging temperature 1Cr16Ni4Mo2N stainless steel microstructure mechanical property corrosion property

ClassificationCode：TG142.1；TG161

year,vol(issue):pagenumber：2024,49(6):215-220

Abstract：

In order to improve the mechanical properties and corrosion resistance properties of stainless steel for high-strength pipelines, the solution and aging treatment on 1Cr16Ni4Mo2N stainless steel for high-strength pipeline was conducted, the influences of aging temperature on the microstructure, mechanical properties and corrosion resistance properties of stainless steel were studied, and its mechanism of action was analyzed. The results show that after aging treatment at 350-625 ℃ for 4 hours, the matrix structures of 1Cr16Ni4Mo2N stainless steel are martensite and austenite, and with the increasing of aging temperature, martensite transforms into austenite. The yield strength ReL and tensile strength Rm of 1Cr16Ni4Mo2N stainless steel first increases and then decreases with the increasing of aging temperature, which has good strength plasticity at the aging temperature of 350 ℃. The results of immersion corrosion test in FeCl3 solution are consistent with those of electrochemical test. The corrosion rate of 1Cr16Ni4Mo2N stainless steel first increases and then decreases with the increasing of aging temperature, and it has the best corrosion resistance property at the aging temperature of 350 ℃. Thus, the optimum aging temperature of 1Cr16Ni4Mo2N stainless steel for high-strength pipeline is 350 ℃, at this time, the stainless steel has good strength and plasticity as well as corrosion resistance property.

Funds：

河南省科技攻关项目（2102210278）；教育部产学合作协同育人项目（221176014）

作者简介：苏宁（1976-），男，学士，工程师，E-mail：suning7611@sina.com

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