The problem is considered of improving impact strength and brittle failure resistance of heat-affected zone (HAZ) metal during welding of thick-walled (30–40 mm) gas pipelines. It is shown that the best HAZ properties are obtained in the case of forming low-carbon bainite in this zone with slow post-welding cooling rates. The carbon content is reduced in pipe steel for this purpose; solid solution elements are added, which increase austenite stability, and microalloying with niobium and titanium is carried out in order to retard grain growth by carbonitride particles.
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Translated from Metallurg, No. 11, pp. 62–67, November, 2010.
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Stepanov, P.P., Zikeev, V.N., Efron, L.I. et al. Improvement in steel weldability for large diameter thick-walled gas pipelines by optimizing chemical composition. Metallurgist 54, 767–774 (2011). https://doi.org/10.1007/s11015-011-9372-z
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DOI: https://doi.org/10.1007/s11015-011-9372-z