Heat-resisting Cr-Mo-V steels belong to the group of steels strengthened by heat treatment. They are characterised by high sensitivity to the cooling rate below the austenitising temperature. This special feature greatly affects the properties of welded joints in these steels and requires postweld heat treatment.Since it is very complicated to carry our heat treatment of large components in electric power stations, and in many cases this operation is not possible, the technology of repair welding without heat treatment is used widely.
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