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6精整工序的完善最后形成了完善的精整工序,包括水压、端部车丝、管端配件、打标、防锈和目检等。管端和连接管件经常用麻布包裹,防止运输过程损坏,有些钢管进行镀锌处理或涂沥青涂料。经过了这些技术变革,使得对接焊接钢管生产工艺日趋成熟,成为应用一个世纪之久的钢管主要生
6 finishing process improvement Finally, the formation of a complete finishing process, including hydraulic pressure, the end of the car wire, pipe end fittings, marking, rust and visual inspection. Tubing and connecting pipe fittings are often wrapped in sackcloth to prevent damage to the shipping process. Some pipes are galvanized or painted with asphalt. After these technological changes, making butt welded pipe production technology matures, become a century of steel main application