我国高参数动力机组普遍采用低合金Cr—Mo—V钢螺栓。实践表明,螺栓在使用中会发生断裂现象,高温高压电厂曾因此发生过设备硬人身事故,直接危及到电厂的安全生产。因此,加强螺检监督、防止螺栓断裂,已经成为电厂金属临督工作者急待解决的问题之一。为了尽快解决这个问题,一九七二年至一九七四年,我们曾先后到十三个高温高压电 China’s high-parameter power unit commonly used low alloy Cr-Mo-V steel bolts. Practice shows that the bolt fracture occurs in use, and the high-temperature and high-pressure power plant once occurred as a result of a hard personal accident, which directly endanger the safety of the power plant. Therefore, to strengthen the supervision of spiral inspection to prevent the bolt from breaking has become one of the urgent problems to be solved by the metal temporary supervision workers in the power plant. In order to solve this problem as soon as possible, from 1972 to 1974, we successively went to 13 high temperature and high voltage