Postweld heat treatment process of carbon steel and low alloy steel
AssigneeNational Institute for Materials Science
InventorsKazuhiro Kimura, Masayoshi Yamazaki, Hiromichi Hongo, Junichi Kinugawa, Takashi Watanabe
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Abstract
The creep strength of a welded joint portion is improved, and damage of the welded joint portion based on the generation or development of cracks is suppressed. A postweld heat treatment process, wherein a welded joint made of carbon steel and low alloy steel is held within austenite single-phase temperature range for a given time and subsequently the joint is cooled by air-cooling or by slow cooling at a cooling rate lower than that of the air-cooling.
Claims3
A postweld heat treatment process comprising the steps of holding a welded joint made of carbon steel or low alloy steel within austenite single-phase temperature range for a given time, thereby annealing the joint, and subsequently cooling the joint by air-cooling or by slow cooling at a cooling rate lower than that of the air-cooling.
Dependencies are inferred from the claim text.