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本厂制造的30万千瓦汽轮机,其高压内外缸和中压内缸螺栓全部采用20CrlMolVTiNbB钢作紧固件.该钢在高温高压下,实际运行中的松弛性能,是决定其能否在使用中长期、可靠、安全地连续运行的关键. 本文对厂内十八组20CrlMolVTiNbB钢的松弛性能试验数据,用三种不同形式的直线方程进行回归外推处理.同时,为了测定实际工况下的螺栓应力松弛状态,对望亭电厂12号机的30万千瓦汽轮机高压内缸M140螺栓进行了剩余应力的实际测定,并介绍了实际测量的全过程与应力换算方法.
The 300,000-kilowatt steam turbine manufactured by our company adopts 20CrlMolVTiNbB steel as the fastener for the high-pressure inner and outer cylinders and the medium-pressure inner cylinder bolts, and the slack performance of the steel in actual operation under high temperature and high pressure determines whether it can be used Long-term, reliable and safe operation of the continuous operation of the key.This article on the plant 18 groups of 20CrlMolVTiNbB steel relaxation performance test data using three different forms of linear equations for extrapolation of regression processing the same time, in order to determine the actual conditions of the bolt Stress relaxation state of the Tingting Power Plant 12th 300,000 kilowatts turbine M140 high pressure cylinder cylinder residual stress of the actual measurement and describes the actual measurement of the whole process and stress conversion method.