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我厂为某有机合成厂制造的乙苯脱氢炉,该炉体直径为3米,是由154根炉管与管板组焊而成的。按技术要求规定:该炉管工作温度为580～750℃,工作压力为1.5公斤力/厘米~2。炉管材质是采用由日本引进的ASTM系列耐热铸态合金钢管,钢号为HK-40,管径为ф133×6.5毫米。管板材质为1Cr18Ni9Ti,板厚60毫米,其化学成分和机械性能见下表。为了保证炉管与管板的组焊质量,我们制定了如下焊接工艺,现介绍如下:
I plant for an organic synthesis plant to manufacture ethylbenzene dehydrogenation furnace, the furnace body diameter of 3 meters, is composed of 154 tubes welded together with the tube plate. According to the technical requirements: The furnace tube operating temperature is 580 ~ 750 ℃, working pressure 1.5 kg force / cm ~ 2. Tube material is the use of imported from Japan ASTM series of heat-resistant cast alloy steel pipe, steel No. HK-40, diameter ф133 × 6.5 mm. Tube plate material 1Cr18Ni9Ti, thickness 60 mm, its chemical composition and mechanical properties in the table below. In order to ensure the quality of the tube and tube plate welding, we have developed the following welding process, are presented below: