| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for estimating accurately a creep damage from the hardness of chrome-molybdenum (Cr-Mo) ferritic high-strength heat resisting steel having a chrome (Cr) content of 9% or more. SOLUTION: In this creep damage estimation method of ferrite steel for estimating nondestructively a creep damage of the ferritic heat resisting steel of a tempered martensitic structure, hardness of the member surface is measured, and a strain quantity of the member is estimated from a relation between the hardness and the strain quantity generated beforehand, and the creep damage is determined from comparison with a creep strain curve determined separately. Especially as for the hardness of the heat resisting steel surface to be measured, the minimum hardness of a welding heat influenced part wherein the damage is progressed most quickly is preferably measured. COPYRIGHT: (C)2006,JPO&NCIPI
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