锅炉过热器不锈钢管的弯头部分,由于管内产生水蒸汽氧化皮的堆积,使过热器下弯头阻塞,常会引起事故。为了防止材料的水蒸汽氧化,从材料角度出发,只有把不锈钢的铬含量提高到20%或者添加2%的硅。但是,提高锅炉管的硅含量,会造成焊接困难。而提高铬含量的同时,必须相应地加20%以上的镍 Boiler superheater stainless steel pipe elbow part, due to the accumulation of water vapor generated within the oxide scale, so that the elbow under the elbow block, often cause an accident. In order to prevent water vapor oxidation of the material, from the material point of view, only the content of chromium in stainless steel is increased to 20% or 2% of silicon is added. However, increasing the silicon content of the boiler tube can result in difficult welding. While increasing the chromium content, it is necessary to add more than 20% nickel accordingly