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蜗壳是水轮机上尺寸最大的一个重要部件,也是决定水轮机单机出力的一个重要因素,其重量约占水轮机总重的1/6。随着我国水轮发电机组单机容量不断增长,对蜗壳材料的技术要求越来越高,传统使用的A_3钢板已远不能满足要求。在毛主席独立自主、自力更生精神的鼓舞下,我国从1963年开始在大中型蜗壳材料方面试验和采用了屈服强度为30～50公斤/毫米~2级的国产低合金高强度钢板。十几年来生产实践表明,采用低合金高强度钢来代替和补充传统的碳素结构钢,不仅满足了电机容量不断发展的需要,而且节约了大量钢材、降低了电站造价、减少了焊接工作量、缩短了安装时间、加速了社会主义建设。因此它具有重大的政治和经济意义。
The volute is one of the most important components on a turbine and also an important factor that determines the output of a turbine. Its weight accounts for about one sixth of the total weight of the turbine. With the single capacity of hydro-generator units in our country growing continuously, the technical requirements for the volute material are getting higher and higher. The traditional A_3 steel plate is far from meeting the requirements. Inspired by Chairman Mao’s independence and self-reliance, China began experimenting with and adopting the domestic low-alloy high-strength steel plates with a yield strength of 30 to 50 kg / mm 2 in 1963. More than 10 years of production practice shows that the use of low-alloy high-strength steel to replace and supplement the traditional carbon structural steel, not only to meet the evolving motor capacity needs, but also saves a lot of steel, reducing power plant costs and reduce the workload of welding , Shortened installation time and accelerated socialist construction. So it has great political and economic significance.