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15MnMoVN钢是高压球型容器用钢，常规的热处理工艺为950～970℃水冷，650～670℃回火空冷。按此工艺热处理后冲击韧度经常不合格。针对这一情况我们进行了亚温淬火工艺试验。该钢经亚温淬火后冲击韧度提高，满足了设计要求。1试验条件及方法试验用钢的化学成分见表1。原热处理
15MnMoVN steel is high pressure ball container steel, conventional heat treatment process is 950 ~ 970 ℃ water cooling, 650 ~ 670 ℃ tempering air cooling. According to this process after heat treatment impact toughness often unqualified. In view of this situation, we conducted a sub-temperature quenching process test. After the quenching of the steel after the impact toughness increased to meet the design requirements. 1 Test conditions and methods The chemical composition of the test steel in Table 1. The original heat treatment