Foreign countries own more than 300 sets of seamless steel tube hot rolling unit, which annual production capacity can reach more than 30 million tons. Among them, there are about 45 sets of continuous tube rolling mills which annual production capacity can reach more than 17 million tons, approximately 57% of total production capacity, about 15 sets were newly built in 21 century. There are original automatic pipe rolling mill more than 70 sets, nearly 20 years, most of which have been discontinued or modified. There are more than 60 sets of extrusion pipe units, most of which are horizontal hydraulic extrusion pipe units, which annual production capacity can reach more than 1 million tons,...

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