Abstract
An investigation of prematurely damaged high-pressure pipelines from steel 25Kh17N2B-Sh showed that the microstructure of their parts contains a carbide network and coarse austenite grains, which are known to worsen the mechanical properties. The possibility of improving the structure and plasticity of parts of high-pressure pipelines from martensitic steel 25Kh17N2B-Sh by preliminary quenching with subsequent subcritical tempering or cyclic heat treatment before final vacuum quenching is discussed below, The capacity for grain growth in the quenching of parts from rods of different heats and the effect of double quenching to improve the coarse-grain structure are investigated.
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