Method of estimating operating temperature of austenitic heat-resistant steel containing Cu (copper), method of estimating creep damage life of austenitic heat-resistant steel containing Cu, method of estimating operating temperature of austenitic heat-resistant steel-made heat transfer tubes containing Cu, and Cu Of Creep Damage Life of Austenitic Heat-Resistant Steel Heat Transfer Tubes Containing Steel

摘要

In order to provide an accurate method for estimating the creep damage life after a long time use of the austenitic heat-resisting steel or in a high temperature range, the austenitic heat-resisting steel 5 containing Cu can be subjected to cold working treatment. The hardened layer 2 is formed, and the relationship between the production amount of the Cu-enriched phase produced in the hardened layer 2 and the Larson mirror parameter expressed as a function of the use temperature and the use time is obtained in advance, and then the actual After forming the hardened layer 2 by cold working on the surface of the heat-resistant steel before being used for the measurement, the amount of Cu-enriched phase produced in the hardened layer 2 actually used at a high temperature for a certain time is measured, The actual use temperature is estimated from the relationship between the obtained amount of Cu-enriched phase and the Larson Miller parameter, the actual amount of Cu-enriched phase produced and the actual usage time. In addition, the creep life can be estimated from the estimated use temperature and actual use stress, and the relationship between the heat stress steel used in advance, the use temperature, and the fracture time.