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二、钢管(一)各国钢管的发展趋势按照生产方法的不同,可以分为无缝钢管和焊接钢管二类。各类钢管的生产方法亦是各种各样的,同时在各主要工业国家中各类钢管所采用的生产方式与发展情况亦都有它各自的特点。1.无缝钢管在无缝钢管的生产中主要的有周期式轧管,自动式轧管,连续式轧管和挤压管等方法。其中周期式轧管是生产无缝钢管的一种重要方法,在欧洲各国得到了广泛应用。自动轧管机在美国得到了广泛的应
Second, the steel pipe (a) the development trend of steel pipe in various countries in accordance with the different production methods can be divided into two types of seamless steel pipe and welded steel pipe. The production methods of various kinds of steel pipes are also varied. At the same time, the production methods and developments adopted by various types of steel pipes in various major industrial countries also have their own characteristics. 1. Seamless steel pipe in the production of seamless steel pipe rolling, automatic rolling, continuous rolling and extrusion pipe and other methods. One of the periodic rolling pipe is an important method of producing seamless steel pipe in various countries in Europe has been widely used. Automatic pipe rolling machine in the United States has been widely used