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我国石洞口二期工程600MW超临界锅炉首次选用了15NiCuMoNb5(WB36)钢作为锅炉侧水冷壁集箱、蒸发器、对流管等部件。这种Cu—Ni—Nb钢是西德30年代发展起来的钢种,使用温度400℃左右,也可用于管壁温度500℃的高应力管道。本文通过对该钢的机械性能、FATT50脆性转变温度、断裂力学性能、疲劳性能、持久强度及焊接工艺的试验研究为我国电站锅炉部件首次应用该钢提供了寿命预测和安全运行的可靠依据。同时为我国汽包用材国产化提供了必要的技术储备。
For the first time, 15NiCuMoNb5 (WB36) steel is selected as the boiler water header, evaporator and convection pipe for the 600MW supercritical boiler in the second phase of Shidongkou Project. The Cu-Ni-Nb steel is a kind of steel developed in West Germany in the 1930s. It can also be used in high-stress pipe with wall temperature of 500 ℃. In this paper, the mechanical properties of the steel, FATT50 brittle transition temperature, fracture mechanics, fatigue properties, long-term strength and welding process of experimental study for the first time the boiler parts of China’s power plant to provide life prediction and safe operation of a reliable basis. At the same time as China’s drum material made available to provide the necessary technical reserves.