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引言 1951年底,Paderwerk Gebr.Benteler厂的一台顶管机投入生产。当时,用于制管的原材料是向各钢铁厂购买的轧制坯。1956年,炼钢厂建成,一台10吨电炉开始投产,在直径160mm、长度1,500mm的钢锭模中底浇钢锭。圆钢锭按所需重量分级以后轧制成管。封顶钢锭所产生的缩孔在顶管机上经常造成杯状坯撕裂和芯棒过早穿透杯状坯。
Introduction At the end of 1951 a pipe jacking machine at the Paderwerk Gebr.Benteler plant was put into production. At that time, the raw materials used for pipe production were rolled billets purchased from various steel mills. In 1956, a steel mill was built and a 10-ton electric furnace was put into operation. The ingot was poured into a steel ingot mold of 160 mm in diameter and 1,500 mm in length. Round ingot according to the required weight after rolling into the tube. Craters produced by capping steel ingots often cause tearing of the cup billet and premature piercing of the cup billet on the pipe jacking machine.