一、问题的提出为了解决30CrMnSiNi2A 钢制造的飞机大梁、起落架和结合螺栓等零件热处理时氧化脱碳问题,我厂在立式电炉中通以甲醇裂化保护气氛进行无氧化加热。甲醇裂解气成份(按体积百分比)为:H_2 65.4%,CO 33%,CH_4 0.7%,CO_2 0.1%。由于这种气氛含有较多的氢,并在热处理时易渗入钢中。通过定氢分析(表1)可以看出,原 First, the problem raised In order to solve the aircraft 30CrMnSiNi2A steel beams, landing gear and bolts and other parts of the heat treatment of decarbonization problems, I plant in the vertical furnace through the methanol cracking protective atmosphere for oxidation-free heating. Methanol cracking gas composition (by volume percentage): H 2 65.4%, CO 33%, CH_4 0.7%, CO_2 0.1%. Because this atmosphere contains more hydrogen, and easy to infiltrate into the steel in the heat treatment. By hydrogen determination (Table 1) can be seen, the original