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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Notes
Naming of different structural components for low-carbon pipe steels was given by the authors in [3].
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Translated from Metallurg, No. 1, pp. 55–62, January, 2012.
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Smirnov, M.A., Pyshmintsev, I.Y., Maltseva, A.N. et al. Effect of ferrite-bainite structure on the properties of high-strength pipe steel. Metallurgist 56, 43–51 (2012). https://doi.org/10.1007/s11015-012-9534-7
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DOI: https://doi.org/10.1007/s11015-012-9534-7