| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of a stock for hot/warm plastic working and its plastic working method to solve a problem of lowering of fatigue strength, etc., and strength reliability due to a carbide crack in cold/ warm plastic working. SOLUTION: A manufacturing method of a stock is so that a molten steel containing C/Cr in term of (Cr+15.5C) of 14.0-42.0 mass % is sprayed to droplets, is collected/solidified to be an ingot, a max length of the carbide in the structure is set to <=5μm. A plastic working method is so that by using the stock by the manufacturing method, the deformation in elongation or compression having a cross section change rate of >=15 % is applied to at least to part by cold/warm plastic working at <=800 deg.C.
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