Effect of tempering temperature on impact property of 37CrMnMo steel

doi:10.13251/j.issn.0254-6051.2020.02.037

Abstract

Abstract:

Microstructure, strength and impact property of 37CrMnMo steel for oil pipe joint tempered at different temperatures were studied by means of impact and tensile tests and microstructure observation. The experimental results indicate that the microstructure of the quenched 37CrMnMo steel oil pipe joint tempered at 500-640 ℃ is composed of tempered sorbite. With the increase of tempering temperature, the tensile strength and yield strength decrease from gentle to steep. Tempered at 500 ℃, the flake carbides are distributed on the original martensite boundaries, and the Charpy absorbed energy is 30.94 J. When the tempering temperature is 600 ℃, the carbides are evenly distributed, and the Charpy absorbed energy reaches a maximum value of 117.49 J. When the tempering temperature is 640 ℃, the carbides coarsen obviously and the Charpy absorbed energy reduces notably. Therefore, the morphology of carbides plays a key role in the strength and toughness of 37CrMnMo steel when quenched at 870 ℃ and tempered at different temperatures.

Key words: 37CrMnMo steel, tempering temperature, impact property, tempering sorbite, carbide

CLC Number:

TG156.6

Dun Yapeng, Yang Wei, Liu Jianyong, Sheng Xiaofei, Yang Yanyan, Liu Yaodong. Effect of tempering temperature on impact property of 37CrMnMo steel[J]. HTM, 2020, 45(2): 193-196.

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