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对厚度为８ｍｍ的退火９Ｃｒ—１Ｍｏ钢炉管进行了冷裂纹、再热裂纹敏感性的试验研究，认为该钢焊接时的ｔ８／５不小于１３ｓ时，可以不预热焊接，并给出了其他情况下选择预热温度的图表。进行了回火参数对该钢模拟粗晶区韧性及硬度的试验，并用阶梯冷却法及加（无）载短时等温时效试验考察了入选回火参数对高温时效性能的影响，结果表明该钢焊后宜进行７４０～７８０℃、至少保温２ｈ的ＳＲ退火处理。最后用上述焊接条件进行了实际炉焊焊接接头试验，取得了满意的结果。
The experimental results of cold crack and reheat crack susceptibility of annealed 9Cr-1Mo steel tube with thickness of 8mm indicate that the steel can be welded without preheating at t8 / 5 of not less than 13s In other cases select the chart for preheating temperature. The tempering parameters were used to simulate the toughness and hardness of the coarse-grained zone of the steel. The effects of the selected tempering parameters on the aging behavior were investigated by the step-cooling method and the short-time isothermal aging test. The results show that the steel After welding should be 740 ~ 780 ℃, at least 2h SR annealing annealing. Finally, the actual welding conditions were used to test the welded joints, and satisfactory results were obtained.