我厂133顶管机组使用的160×160毫米方管坯,原由外厂调供热轧管坯。使用的外调热轧管坯价格高,运输困难。为了降低钢管成本,增加盈利,保证生产正常进行,我厂于1966年开始设计建造R5500弧型连铸机。1979年4月连铸机初具生产条件,开始试生产,1979年4月至1982年6月,共生产160×160毫米连铸方管坯3万余吨,成坯率达到95～98％。1982年 I plant 133 pipe jacking unit used 160 × 160 mm square tube billets, originally transferred from the outside for hot-rolled tube blank. The use of the outer hot rolled tube billet prices, transportation difficulties. In order to reduce the cost of steel, increase profitability and ensure the normal production, our factory began designing and building R5500 Arc Continuous Casting Machine in 1966. April 1979 continuous casting machine beginning to take the production conditions, began trial production, from April 1979 to June 1982, a total of 160 × 160 mm continuous casting square tube produced more than 3 tons of billet reached 95 to 98% . 1982