Abstract
Abstract The structure, impact strength and dynamic crack resistance of pipe billets from structural steels 09G2S, 25 and 35Kh are compared after a heat treatment and after different variants of deformation-and-heat treatment involving plastic deformation by cold radial forging (CRF) and subsequent annealing. The features of the structure formed by CRF processing are revealed and their evolution during subsequent thermal effects is considered. It has been shown that CRF and annealing of initially highly tempered pipe billets at 600 °C leads to formation of an ultra-fine grained structure, thereby achieving reliability characteristics close to the highly tempered state with increased strength characteristics.
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