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1我国农机工业及其热处理概况我国农机工业是从50年代初期开始逐步发展起来的，到1991年底，已有县以上农机工业企业2501家，乡镇村农、牧、渔机械制造企业6325家，仅县以上企业就形成了14个分行业，能够生产16大类，100小类近5000个品种的农机产品。各种农业机械和器具已成为
1 Overview of China’s agricultural machinery industry and its heat treatment China’s agricultural machinery industry began to develop gradually from the early 1950s. By the end of 1991, there were 2501 agricultural machinery industry enterprises above the county level and 6,325 agricultural, animal husbandry and fishing machinery manufacturing enterprises in townships and villages. Enterprises above the county level have formed 14 sub-sectors, capable of producing agricultural machinery products of 16 categories and 100 sub-categories of nearly 5,000 varieties. Various agricultural machinery and appliances have become