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针对用户在高压锅炉管使用过程中提出的在ASME标准要求的范围内将P92中铬质量分数的下限由8.5%提高至9.0%的需求,对ASME要求下限和上限两种质量分数的P92钢的常规性能、组织和高温长时性能均进行对比,并对不同加热温度下高铬质量分数P92中出现高温δ铁素体的量进行对比讨论。试验结果表明,铬质量分数提高能够提高P92的常温强度和高温持久强度,但降低常温冲击功和高温蠕变后的面缩率和伸长率,钢管在服役过程中发生无预警断裂的几率大大增加。同时控制高铬质量分数P92的加热温度能够控制高温δ铁素体的产生。
In view of the demand raised by users in the process of using high-pressure boiler tubes to increase the lower limit of chromium content in P92 from 8.5% to 9.0% within the range required by ASME standards, the requirements of ASME for P92 steel with both lower and upper limit values Conventional performance, microstructure and high temperature long-term performance are compared, and the amount of high-temperature δ ferrite in the high-chromium mass fraction P92 at different heating temperature is compared and discussed. The experimental results show that the increase of chromium content can improve the room temperature strength and high temperature permanent strength of P92. However, the reduction of the shrinkage rate and elongation after impact energy at high temperature and high temperature creep greatly increases the probability that the steel pipe will be free from any premature breakage during service . At the same time, controlling the heating temperature of the high chromium content P92 can control the production of high temperature δ ferrite.