一、前言电站弯管裂纹和断裂事故,以苏联与西德发生得较多,因此这两个国家对弯管问题的研究进行得较早,但至今尚无重要“突破”。美、日等国由于取用的管壁厚较大,因而事故较少,故这方面的研究报告也较少。我国电力工业的高温高压机组主要是解 I. INTRODUCTION Cracking and rupture of power station pipe benches occurred more frequently in the Soviet Union and West Germany. Therefore, the study on elbow bending has been carried out earlier in these two countries, but so far no important “breakthrough” has been made. The United States, Japan and other countries due to access to the larger wall thickness, resulting in fewer accidents, so the research reports in this area less. China’s power industry is mainly high-temperature high-pressure unit solution