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The article discusses the effect of annealing temperature applied during heat treatment as well as the suitability of preheating before the welding of butt joints in pipes (having a diameter of 33.7 mm and a wall thickness of 4.5 mm) made of steel X10CrMoVNb9-1 (P91). In the article, the structure and properties of a joint subjected to heat treatment performed in accordance with manufacturing standards...
Effect of ‘double austenitizing’ (DN) on microstructure evolution and mechanical properties of martensitic 9Cr–1Mo–V–Nb (P91) steel were studied and compared with the ‘conventional normalizing’ (CN) process. In CN treatment, P91 steel is normalized at 1050 °C for 1 h, finally air cooled. In DN treatment, the first stage of normalizing was performed at 1050 °C/1 h/air cool. The second stage of normalizing...
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