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1 前言换热器是丁业生产领域十分重要的设备之一,其种类多应用广,如果产生裂纹、腐蚀等破坏,降低产品的使用寿命,影响生产。某厂生产的一批换热器,壳体材质为1Cr18Ni9不锈钢,厚度为9mm,工作介质为过热蒸汽和水。运行时的压力为0.4～0.5MPa,蒸汽温度为140℃～190℃;管程内部循环水压力为0.8MPa温度为85℃。该批换热器投入使用后,运行多则半年,最短仅6天即在壳体环焊缝附近
1 Preface Heat exchanger is one of the most important equipment in the field of Ding industry. It is widely used in many kinds of applications. If it is cracked or corroded, it will reduce the service life of the product and affect the production. A factory produced a number of heat exchangers, shell material 1Cr18Ni9 stainless steel, a thickness of 9mm, the working medium is superheated steam and water. Operating pressure of 0.4 ~ 0.5MPa, steam temperature of 140 ℃ ~ 190 ℃; tube internal circulation water pressure of 0.8MPa temperature of 85 ℃. The batch of heat exchanger put into use, running more than six months, the shortest only 6 days in the shell near the weld