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前言随着我国汽轮机制造业的发展,高强度大截面的用钢消耗量日益增多,寻求适合我国资源情况,又满足产品设计要求的新钢种的研究工作,已成为当前迫切任务之一。汽轮机主要部件中的低压轴和叶轮,特别是最后数级的叶轮,它被红套在转子上,承受了较大的离心应力,按照设计要求,叶轮用钢具有内外一致的强度和韧性,具体要求按电站和船用汽轮机叶轮锻件的技术条件,机械性能按Ⅶ级规定:σs 75—93kg/mm~2
Preface With the development of China’s steam turbine manufacturing industry, the consumption of steel with high strength and large cross section has been increasing day by day. It has become one of the urgent tasks to seek new steel grades suitable for our country’s resources and product design requirements. The low-pressure shaft and the impeller of the main components of the steam turbine, especially the impellers of the last stage, are sleeved on the rotor with a large centrifugal stress. According to the design requirements, the impeller steel has consistent strength and toughness both inside and outside, Requirements according to the technical conditions of power plant and marine turbine forgings, mechanical properties according to the provisions of Ⅶ level: σs 75-93kg / mm ~ 2