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我们研究了在2.7Ni-0.45Cr-0.5Mo-0.1V钢中,降低硅含量对机械性能的影响,以便为了解决钢锭偏析问题,采用低硅钢来制造高压-低压整体转子轴。降低硅合量时,可以改善韧性和回火脆化,但在500℃以下的温度,抗张强度也会降低。这一点可以用增加少量的铬来得到充分补偿,而不致损害其他性能。不管降低硅或是增加铬,蠕变断裂强度都不会发生变化。川崎钢铁公司曾经发展一种特殊的炼钢方法,可以制出磷硫和其他杂质都很低的高级钢。用此法实地制成了一根整体的转子轴,试验证明它具有令人满意的机械性能,正象我们进行初步的研究后所预期的那样。
We investigated the effect of decreasing the silicon content on the mechanical properties in a 2.7Ni-0.45Cr-0.5Mo-0.1V steel so that low silicon steel is used to make the high-pressure-low-pressure monobloc shaft in order to solve the ingot segregation problem. Lowering the amount of silicon, can improve the toughness and temper embrittlement, but at temperatures below 500 ℃, the tensile strength will be reduced. This can be fully compensated for with a small addition of chromium without damaging other properties. Creep rupture strength does not change whether silicon is reduced or chromium is added. Kawasaki Iron and Steel Company has developed a special steelmaking method that can produce phosphorus and sulfur and other impurities are low-grade high-grade steel. Using this method to make an integral rotor shaft, the experiment proved it has satisfactory mechanical properties, just as we did after the preliminary study.