Abstract
Mechanical properties of pipe steel 07G2MFB are studied after cooling from the austenitic region at rates of 0.9–32°C/sec making it possible to obtain a ferrite-bainite structure with different ratios of structural components. It is shown that formation of a predominantly bainitic structure formed with high cooling rates provides less crack resistance with static loading than a structure in which polygonal ferrite predominates. A bainitic structure is preferable with dynamic loading. Treatment leading to formation of coarse islands of martensite-austenite (MA) component within a ferrite-bainite structure has an unfavorable effect on crack tip opening displacement CTOD, ductile-brittle transition temperature T50, and resistance to hydrogen embrittlement ∆Ψ/Ψ.
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