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过去认为12Cr 钢转子能够承受的蒸汽温度上限是566℃,但是,现代先进的大功率汽轮机设计要求把蒸汽温度上限提高。提高现有的12Cr 钢转子蠕变断裂强度的关键因素,是把“当量钼含量”调整到最佳值,在不含钨的情况下,这个最佳值是1.5%。日本电力开发公司的若松电站高温汽轮机高中压转子在593/593℃蒸汽中工作,已采用电渣重熔钢制造出来,其成分(%)为:C0.14、Si0.08、Mn0.51、P0.013、S0.001、Ni0.60、Cr10.23、Mo1.48、V0.17、Nb0.056、N0.045、A10.002。转子的最后加工重量为11t。它的热处理后的蠕变断裂强度为122MPa(593℃和10~5h)。本文报道了这种材料的设计原理及其在若松转子锻件上达到的实际成就,涉及在1000MW 级先进的汽轮机转子上的预期的工作情况。
In the past, the maximum steam temperature that the 12Cr steel rotor could withstand was 566 ° C. However, the design of modern advanced high-power steam turbines requires an increase in the steam temperature upper limit. A key factor in increasing the creep rupture strength of existing 12Cr steels is to adjust the “equivalent molybdenum content” to an optimum, which is 1.5% in the absence of tungsten. The high-pressure steam turbine high-pressure steam turbine of Japan Power Development Corporation’s Wakamatsu High-temperature Steam Turbine operates at 593/593 ℃ steam and has been produced by electroslag remelting. Its composition (%) is: C0.14, Si0.08, Mn0.51, P0.013, S0.001, Ni0.60, Cr10.23, Mo1.48, V0.17, Nb0.056, N0.045, A10.002. The final rotor weight is 11t. Its heat treatment creep rupture strength of 122MPa (593 ℃ and 10 ~ 5h). This article reports on the design principles of this material and the actual achievements it has achieved on the Worson rotor forgings, which are expected to work on advanced turbine turbines of 1000 MW.