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3 我国的现状及其差距3.1 发展历史沿革 1949年前,我国仅在汉阳、上海、鞍山、太原等地有几套手工操作的横列式中小型轧机。50年代初期,我国引进了原苏联、东欧国家的技术及3套机组,其中φ500mm横列式中型轧机1套(轧合金钢)、φ300mm连续式小型轧机1套、φ250mm半连续式棒线轧机1套。同时自行设计与制造了φ500mm横列式中型轧机1套、φ430/φ300mm横列式小型轧机1套。 1958年以后,六七十年代,全国各地按
3 The Current Situation and the Gap in Our Country 3.1 Historical Evolution Before 1949, there were only a few sets of small and medium-sized rolling mills operated by hand in Hanyang, Shanghai, Anshan and Taiyuan. In the early 1950s, China introduced the technology of the former Soviet Union and Eastern European countries and 3 sets of units, of which 1 set of φ500mm medium-sized mill (rolling alloy steel), 1 set of φ300mm continuous mini mill, 1 set of φ250mm semi-continuous bar mill . At the same time to design and manufacture of a φ500 mm row of medium-sized mill 1 set, φ430 / φ300 mm line of a small mill. After 1958, sixties and seventies, all over the country press