在过去10年到15年中,曾发生过多起除氧器开裂甚至破坏的事故。开裂机制相当复杂。目前认为使用中应力腐蚀和腐蚀疲劳裂纹的萌生和扩展是造成失效的主要原因。本文只涉及焊接方法制造的除氧器。开裂现象的特征是裂纹优先发生于焊接接头的热影响区和焊缝金属内。因此,为了彻底了解失效原因,必须充分考察焊接接头的特性。一、设计和材料简言之,除氧器作用原理是在铁素体钢制作的容器内,利用蒸汽除去溶解于水中的 In the past 10 to 15 years, there have been many deaerator cracking or even destruction of the accident. Cracking mechanism is quite complicated. It is currently believed that the use of stress corrosion and corrosion fatigue crack initiation and expansion are the main causes of failure. This article only deals with deaerators made by welding methods. Cracking is characterized by cracks preferentially occurring in the heat affected zone and in the weld metal of the welded joint. Therefore, in order to fully understand the cause of failure, we must fully consider the characteristics of welded joints. First, the design and materials In short, the principle of deaerator is made of ferritic steel containers, the use of steam to remove dissolved in water