API Machinery Steel Pipes API机械制造钢管 Polyethylene Coated Steel Pipes 聚乙烯包覆管 H.F. Longitudinal Submerged Arc Welded Pipes 高频直缝埋弧焊管 ERW Round Pipe Mill 高频直缝电阻焊接圆管生产机组 H Beam Line with H.F. 高频直缝电阻焊接H型钢 Slitter Production Line 钢管纵剪生产线 Accumulator 活套 End Facing & Beveling Machine 平头修端机 Shear and End Welder 剪切对焊机 Uncoiler 开卷机