前言为了高速度发展钢管工业,世界各国正朝着大型化、高速化、连续化、自动化方向发展。由于连续轧管机组具有效率高、产量大、生产的钢管质量好、自动化程度高等优点(参见表1.2)。近年来。各主要发达的工业国家,都大力发展连续轧管机组。据不完全统计。目前全世界有连续轧管机组约30多套,其中1962～1972年之间,就建设了11套,单是日本1968～1970年就投产了三套现代化连续轧管机组。连续轧管机组所生产的钢管 Foreword In order to develop the steel pipe industry at a high speed, all the countries in the world are moving towards the direction of large-scale, high-speed, continuous and automatic development. As the continuous pipe mill with high efficiency, large output, the production of steel quality, high degree of automation advantages (see Table 1.2). In recent years. The major developed industrial countries, are to develop continuous pipe rolling unit. According to incomplete statistics. At present, there are about 30 sets of continuous tube rolling mills in the world, of which 11 were built between 1962 and 1972. In Japan alone, three modern continuous rolling mills were put into operation from 1968 to 1970. Continuous tube mill production of steel pipe