Assessment of Service Life of HCM12 Steel After 100 000 Hrs of Service

Archives of Metallurgy and Materials

G. Golański¹  A. Zieliński²  P. Skupień²  H. Paszkowska² 

[1] CZESTOCHOWA UNIVERSITY OF TECHNOLOGY, INSTITUTE OF MATERIALS ENGINEERING, 19 ARMII KRAJOWEJ AV., 42-200 CZESTOCHOWA, POLAND;INSTITUTE FOR FERROUS METALLURGY, 12-14 K. MIARKI STR., 44-100 GLIWICE, POLAND

关键词: Keywords: steel HCM12;    creep;    microstructure;    mechanical properties;    residual life;   

DOI  :  10.1515/amm-2016-0173

学科分类：金属与冶金

来源: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica / University of Mining and Metallurgy

【 摘 要 】

The subject of the research was a material in the form of a ϕ38×4 pipe from HCM12 steel used for steam superheater coils in power boilers with supercritical and ultra-supercritical steam parameters. This article presents results of investigations of mechanical properties and microstructure of material of the examined tube in the as-received condition and after 100,000 h service at 585°C under creep conditions. Creep tests were carried out for the material after 100,000 h service to determine the disposable residual life. The impact of changes in mechanical properties and degradation of the microstructure on the loss of creep resistance compared to the as-received condition was assessed. The investigations have revealed that the examined steel after 100,000 h service meets the requirements for this steel in the as-received condition with regard to strength properties at room and elevated temperature. The creep tests have revealed a significant loss of creep resistance, which was estimated at around 60-70% compared to the as-received condition.

【 授权许可】

Unknown