The Influence Of Repair Welded Joint On The Life Of Steam Pipeline Made Of Cr-Mo Steel Serviced Beyond The Calculated Working Time

Archives of Metallurgy and Materials

A. Zieliński¹  G. Golański² 

[1] INSTITUTE FOR FERROUS METALLURGY, POLAND;INSTITUTE OF MATERIALS ENGINEERING, CZESTOCHOWA UNIVERSITY OF TECHNOLOGY, POLAND

关键词: Keywords: creeping;    material diagnostics;    welded joints after service;    Cr-Mo steel;    residual life;   

DOI  :  10.1515/amm-2015-0257

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 aim of the paper was to examine the influence of repair welded joints on the service life of steam pipelines for over 220 000 hours of service in creep conditions. The research included the study of the microstructure using scanning microscopy, the tests on mechanical properties at room and elevated temperature, determining the nil ductility transition temperature, and short-time creep tests to determine the residual life of the material. The tests allowed determining the time of further safe operation of elements of the steam pipeline with a repair welded joint, with reference to the base material, and the welded joint after service. The assessment of residual life and disposable residual life, and at the same time determining the possible time of further safe operation, has an essential meaning in the case of elements serviced considerably beyond the calculated working time.

【 授权许可】

Unknown