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2000年 11月 17日，石嘴山发电厂 7＃机小修期间，发现自动主汽门门盖法兰与颈部过渡处有长约 500 mm的裂纹，为保证机组安全运行，必须对裂纹进行修复。 1方案制定 7＃机自动主汽门门盖材质为 ZG20CrMoV，法兰厚度为 140 mm,颈部连接法兰处厚度约为 80 mm，形状复杂，厚度
On November 17, 2000, during the minor repair of No.7 unit of Shizuishan Power Plant, it was found that there was a crack of about 500 mm in length between the flange of the main steam gate and the neck. To ensure the safe operation of the unit, cracks must be repaired. A program development 7 # automatic main steam door cover material ZG20CrMoV, the flange thickness of 140 mm, the thickness of the neck flange connection is about 80 mm, complex shape, thickness