冷轧cold rolling冷拨 cold drawn生产效率production efficiency设备equipment强度strength直缝焊管straight welded tube螺旋焊管spiral welded tube薄钢板Thin steel plate中厚钢板Medium thick plate中板middle plate厚板thick plate特厚板 especially thick plate 理论重量Theoretical weight单位长度unit length单位面积unit area扁钢flat steel实际长度actual length实际重量actual weight偏差deviation负偏差negative deviation正偏差positive deviation开平板opened plate报价quote 钢的牌号 Steel grades材质material碳素结构钢carbon structural steel普通碳素结构
