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烟台鲁宝钢管厂从１９９２年开始试制１２１～１５９ｍｍ低中压锅炉用热轧无缝管。该厂采用曼式穿孔机穿孔的毛管，经Ａｃｃｕ－Ｒｏｌｌ轧管机轧制，生产出具有壁厚尺寸精度高、表面质量好的热轧无缝管。在试制过程中，先后解决了：①钢管表面划伤。采用铸铁导盘代替不锈钢导
Yantai Lubao Pipe Plant from 1992 trial production of 121 ~ 159mm low and medium pressure boiler with hot-rolled seamless pipe. The plant uses Man perforation perforation of the capillary, the Accu-Roll mill rolling to produce a wall thickness with high precision, good surface quality of hot-rolled seamless pipe. In the trial process, has solved: ① steel surface scratches. Cast iron guide instead of stainless steel guide