Direct Square Forming Tube Mill: LW120-LW2000
Cold bending profile steel and square/rectangular pipe line is the equipment used for production of open-mouthed and close-mouthed profile steel. With combined type of rollers, and multi points pre-bending forming technology, rollers can be changed quickly with no necessary to remove main axis or stands. Further, with the low loading, it can reduce 80% of rollers cost and 90% of time for changing rollers. All specified open or close mouthed profile steel can be produced with one set of combined rollers. lt is suitable for multi-specification small batch production and meet the market requirement as well.
Square tube mill line is an industrial production line used to manufacture square or rectangular steel pipes directly from steel strips through continuous roll forming, high-frequency welding, sizing, and straightening processes. Compared to traditional round-to-square forming, direct square forming improves precision and material utilization. As a professional square tube mill line supplier, Great Wall offers a complete range of high-performance tube mill equipment for square and rectangular tubes.
The process begins with steel coil uncoiling, followed by leveling and shearing. The strip is then fed into the forming section where rolls progressively shape it into square or rectangular forms. High-frequency induction welding bonds the edges, after which the welded tube undergoes sizing, straightening, cutting, and stacking. Great Wall’s square tube mill lines feature solid-state HF welding, CNC control systems, and automatic adjustment modules to ensure stability and consistency across production runs.
Square and rectangular steel tubes produced by Great Wall square tube mill lines are widely used in:
Steel structure construction (e.g., warehouses, stadiums)
Guardrails and fencing
Mechanical structures and frames
Automotive chassis and components
Solar mounting structures
Agricultural machinery
In-house CNC machining, roll forming, and assembly lines
ISO 9001 certified, CE-compliant manufacturing process
Pre-shipment full trial assembly & performance testing
Turnkey service: layout design, training, and after-sales support
Fast spare parts supply & global technical assistance
1,000+ projects delivered across 25+ countries
Great Wall ensures stable performance, fast delivery, and full engineering support for every square tube mill line.
Parameter Display
| Model | Tube Size Range (mm) | Wall Thickness (mm) | Tube Mill Speed (m/min) |
| LW320 | 30x30 – 80x80 | 1.0 – 4.0 | 20 – 80 |
| LW400 | 40x40 – 100x100 | 2.0 – 5.0 | 15 – 50 |
| LW600 | 80x80 – 150x150 | 2.0 – 6.0 | 15 – 50 |
| LW720 | 80x80 – 180x180 | 3.0 – 7.0 | 15 – 50 |
| LW800 | 90x90 – 200x200 | 3.0 – 8.0 | 15 – 45 |
| LW1000 | 130x130 – 200x200 | 3.0 – 10.0 | 15 – 30 |
| LW1200 | 170x170 – 300x300 | 4.0 – 14.0 | 10 – 20 |
| LW1600 | 170x170 – 400x400 | 4.0 – 16.0 | 10 – 20 |
| LW2000 | 170x170 – 500x500 | 4.0 – 18.0 | 10 – 20 |
| Problem | Solution by Great Wall Square Tube Mill Line |
|---|---|
| Low yield rate from round-to-square forming | Direct forming technology improves yield and reduces scrap |
| Inconsistent welding quality | Solid-state HF welding ensures strong, uniform welds |
| Manual adjustment causing downtime | CNC auto-adjustment enhances setup speed and repeatability |
| Material waste due to poor cutting control | High-precision flying saw systems improve cutting accuracy |
| Scaling production for larger sizes | LW2000 model supports high-capacity and large-diameter tubing |
Product Disaplay
