Effect of tempering temperature on microstructure and properties of an oil casing steel used for deep wells

doi:10.13251/j.issn.0254-6051.2024.03.019

Abstract

Abstract: Effect of tempering temperature on the microstructure and mechanical properties of a deep well oil casing steel quenched at 920 ℃ was studied by means of optical microscope (OM), scanning electron microscope (SEM) and tensile testing machine. The results show that the experimental steel obtains tempered martensite structure after tempered at 500-600 ℃, which has high product of strength and elongation and high toughness, where the product of strength and elongation is ranged from 20.5 to 22.1 GPa·%, and the impact absorbed energy is ranged from 94.6 to 100.3 J. When the tempering temperature is 550 ℃, the deep well oil casing experimental steel has the best comprehensive mechanical properties, with tensile strength of 978 MPa, yield strength of 935 MPa, and product of strength and elongation of 22.1 GPa·%, impact absorbed energy is 100.3 J.

Key words: oil casing steel, tempering temperature, microstructure, mechanical properties

CLC Number:

TG142.1

Wang Jiaojiao, Zhao Linlin, Gao Yunzhe, Shi Shuai, Wu Xiaolong, Zhao Yanqing, Zhou Yuqing, Gong Junjie. Effect of tempering temperature on microstructure and properties of an oil casing steel used for deep wells[J]. Heat Treatment of Metals, 2024, 49(3): 112-115.

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