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在石油化工厂裂解炉中均采 Cr25Ni20耐热钢管作炉管。我处在上海某厂裂解炉的焊接中,通过模拟焊接,对焊接试件的机械性能、×光检验、微观金相等,总结出 Cr25Ni20钢管手工电弧焊的焊接方法,现介绍如下。一、焊接特点炉管系采用美国进口钢 A312—81a 轧制的φ114×8的无缝钢管,相当我国 Cr25Ni20钢种,复验其钢管的化学成分见表1:
Cracking furnace in the petrochemical plant are adopted Cr25Ni20 heat-resistant steel pipe for the furnace. I was in Shanghai factory cracking furnace welding, through the simulation of welding, the mechanical properties of the welded specimens, × light test, micro-gold, concluded Cr25Ni20 steel arc welding manual welding methods are described below. First, the welding characteristics Furnace tube system using the United States imports of steel A312-81a rolling φ114 × 8 seamless steel pipe, equivalent to China’s Cr25Ni20 steel, retest the chemical composition of the steel in Table 1: