The welding procedure of 9Cr-1Mo alloy, especially the preheating and the post weld heal treatment, have been investigated in this paper. The critical ts/5=11s at which cold crack occurs has. been proposed as a criter...The welding procedure of 9Cr-1Mo alloy, especially the preheating and the post weld heal treatment, have been investigated in this paper. The critical ts/5=11s at which cold crack occurs has. been proposed as a criterion to determine whether preheating is needed. The preheating temperature is decided by the curves of heat input, plate thickness of the 9Cr-1.Mo steel vs. preheating temperature when the heat input and plate thickness are changed It is necessary to stipulate tempering parameter|P|*for welding heat treatment of the 9Cr-1Mo steel the recommended tempering parameter[P] should be controlled within 20.6 -21.3. Tempering parameter [P] is determined by tempering temperature and holding time. Tempering temperature is 760-790℃ while the period of holding time is 2 hours in this experiment. The temperature range of 450-550℃ should t be avoided during the post-heat treating since this is the sensitive tempering induced embrittle temperature of the 9Cr-1Mo steel.展开更多
文摘The welding procedure of 9Cr-1Mo alloy, especially the preheating and the post weld heal treatment, have been investigated in this paper. The critical ts/5=11s at which cold crack occurs has. been proposed as a criterion to determine whether preheating is needed. The preheating temperature is decided by the curves of heat input, plate thickness of the 9Cr-1.Mo steel vs. preheating temperature when the heat input and plate thickness are changed It is necessary to stipulate tempering parameter|P|*for welding heat treatment of the 9Cr-1Mo steel the recommended tempering parameter[P] should be controlled within 20.6 -21.3. Tempering parameter [P] is determined by tempering temperature and holding time. Tempering temperature is 760-790℃ while the period of holding time is 2 hours in this experiment. The temperature range of 450-550℃ should t be avoided during the post-heat treating since this is the sensitive tempering induced embrittle temperature of the 9Cr-1Mo steel.
