1前言水轮发电机蜗壳钢板冷脆评定一直处于一个定性阶段。常使用的指标有50％FATT，NDT＋30℃V15TT、止裂温度、落锤试验等。这些评定方法都是定性的。由于冷脆是个多种因素控制的系统问题，故冷脆问题很难用上述定性评定方法进行完全的控制，冷脆事故时而发生。本文介绍一种定 1 Preface Turbine scroll case brittle brittleness assessment has been in a qualitative stage. Commonly used indicators are 50% FATT, NDT +30 ℃ V15TT, crack stop temperature, drop hammer test. These methods of assessment are qualitative. As cold crisp is a system problem controlled by many factors, it is very difficult for the cold crisp to be fully controlled by the above-mentioned qualitative evaluation method, and the cold crisp accident happens occasionally. This article describes a fixed