蒸汽锅炉受压元件由于承受介质工作压力(包括定压运行、变压运行及压力升降等)、各种外加载荷(包括元件自重和介质重量等构成的均匀外载,以及因支承、悬吊等引起的局部集中外载)、各种温度热应力(包括正常运行壁温差引起的稳定热应力,锅炉起停过程中不稳定传热引起的暂时热应力,以及受热波动周期变化的交变热应力)及工作介质的腐蚀作用,再加上由于结构问题、材料缺陷、强度不够、运行欠妥及工艺质量等 Steam boiler pressure components due to withstand medium working pressure (including constant pressure operation, variable pressure operation and pressure rise and fall, etc.), a variety of external load (including components such as dead weight and medium weight uniform load, and due to support, suspension, etc. Caused by the local concentration outside the load), a variety of temperature thermal stress (including the normal operation of the wall temperature difference caused by stable thermal stress, boiler start and stop during the transient heat transfer caused by temporary thermal stress, and thermal cycles fluctuating alternating thermal stress ) And the corrosive effect of the working medium, coupled with structural problems, material defects, insufficient strength, defective operation and process quality