The high-frequency pipe production line is specialized equipment to produce high frequency straight seam welded pipes for structuralpipe and industrial pipe with 70mm×70mm -170mm×170mm and wall thickness of 2.0mm-6.0mm.


Compare with round into square&rectangle forming way,this way is better for the shape at the edge of cross section,comparatively, semi-diameter of inner arc is Small, and the brim is flat, outlook is regular.
It is directly roll the steel strip and bend it to square & rectangular shape, then weld it to finish the formation.

| Product&yield | Round Pipe | 89mm-219mm Thickness:2.0mm-8.0mm |
| Square & rectangle tube | 70mm×70mm -170mm×170mm Thickness:2.0mm-6.0mm | |
| Length | 6m-12m Length Tolerance: ±3mm | |
| Production Speed | 20-50 m/min | |
| Production capacity | 35,000ton/year | |
| Consumption | Mill installed capacity | 280 kw |
| Line Area | 100m(length) ×9m (width) | |
| worker | 6-8 workers | |
| Raw Material
| Carbon Steel coil | Q235B(ASTM GR·D,σs 230) |
| Width | 280mm-690mm Thickness: 2.0mm-8.0mm | |
| Coil ID | 600-800mm | |
| Coil OD | Max 2000mm | |
| Coil Weight | 8.0t |


Scrolling up→ Uncoiling → Shear and Welding→ Spiral accumulator→ Forming → H.F. induction welding→ External burr removing→ Cooling → Sizing→ Flying saw → Run out table →Inspecting→ Packing→ Warehouse
| Round pipe | Cold roll forming process | Good roller design |
| ZTF forming process | Save alt least 60% roller cost with electric control adjustment | |
| Square & rectangular pipe | General round-to-square process | Stable forming process |
| Round-to-square with turkshead | Good pipe quality | |
| Process of directly square-to-square(DSS) | One set of roller can produce all tubes with electric control and automatic adjustment |

We can design and manufacture square tube machine according to customer’s requirement.