Heat treatment process of refining microstructure of carbide-free bainitic steel seamless pipe

doi:10.13251/j.issn.0254-6051.2022.10.019

Abstract

Abstract: Microstructure and mechanical properties of carbide-free bainitic seamless steel tube under different heat treatment processes were studied. The results show that the as-hot rolled carbide-free bainitic steel seamless pipe has coarse structure, high strength and low toughness. After hot rolling and low temperature tempering, the toughness improves a little, which is still low. After hot rolling, normalizing and low temperature tempering, the toughness improves, but there is still some coarse microstructure. After hot rolling and high temperature tempering at 690 ℃ for 300 min, then normalizing and low temperature tempering, the microstructure refines and the inheritance eliminates, which greatly improve the toughness of the carbide-free bainitic steel seamless pipe and cause the impact fracture characteristics to change from brittle fracture to ductile fracture.

Key words: carbide-free bainitic steel, seamless pipe, microstructure refinement, heat treatment process

CLC Number:

TG142.1

Cheng Juqiang. Heat treatment process of refining microstructure of carbide-free bainitic steel seamless pipe[J]. Heat Treatment of Metals, 2022, 47(10): 119-123.

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