HGF250 Direct-Forming Square Pipe Line (Up to 250×250mm, No Roll Change) | Teneng, Shijiazhuang, China

The HGF250 is a high-frequency welded pipe production line for large square and rectangular tube. It makes square tube from 120 × 120mm to 250 × 250mm and rectangular tube from 100 × 140mm to 200 × 300mm, with walls from 5.0mm to 12.0mm, in lengths from 6 to 12m with a length tolerance of ±2mm.

Instead of forming a round tube first and then squaring it, the line forms square and rectangular sections directly. Teneng says this gives a better section shape, with a smaller inner radius, straight edges, and a clean, neat appearance. It uses multi-point bending to remove axial force and lateral wear during forming, which reduces the number of forming passes and lowers power loss and roll wear.

The line uses combined rollers, so one set can produce dozens of square and rectangular sizes without a roller change. Teneng says this cuts roller costs by 70% compared with dedicated roll sets. It runs low carbon and low alloy steel coil, up to Q355, and welds with solid-state high-frequency welding.

Why Choose Direct Square Forming?

Round-to-square mills need a new set of rolls for each size, and large square tube can need many sets. Direct forming with combined rollers changes that.

• Fewer roll sets. One set of combined rollers makes dozens of sizes, cutting roller spares and changeover time. Teneng claims a 70% reduction in roller cost.
• Better section shape. A smaller inner radius and straight edges give a cleaner profile.
• Less wear. Multi-point bending reduces axial force, lateral wear, forming passes, and power loss.
• Versatile. The line can also make round pipe, special-shaped tube, and other sections.
• Stated warranty and delivery. Two-year warranty, with about six months' delivery.

Machine Specifications

• Square tube: 120 × 120mm to 250 × 250mm
• Rectangular tube: 100 × 140mm to 200 × 300mm
• Wall thickness: 5.0mm to 12.0mm
• Pipe length: 6.0 to 12.0m
• Length tolerance: ±2.0mm
• Forming method: direct square forming
• Welding method: solid-state high-frequency welding
• Feeding direction: right or left side
• Coil material: low carbon steel and low alloy steel, up to Q355
• Main power: 132kW to 200kW
• High-frequency power: 300kW to 400kW
• Control: semi-automatic control system

Line layout

• Forming section: 13 horizontal roll stands (including 5 universal roll stands) and 3 vertical roll stands
• Welding section: guide roll stand, squeeze roll stand, external burr removal roll stand, and polishing roll stand
• Sizing section: 4 universal roll stands, 1 vertical roll stand, and 2 Turk's heads

Commercial details

• Brand: TENENG
• Machine colour: blue or green
• Payment methods: T/T, LC, DP
• Shipping port: Tianjin Port, China
• Terms: EXW, FOB, CIF
• Delivery time: about 6 months
• Warranty: 2 years, excluding spare parts and man-made damage

Condition Available: New

Key Features

• Direct square and rectangle forming
• Combined rollers, so one set makes dozens of sizes
• Multi-point bending reduces axial force and roll wear
• Double-housing horizontal roll stands, with servo-adjusted upper roll height
• Solid-state high-frequency welding with external burr removal and polishing
• Modular design for easy assembly, disassembly, and replacement of components
• Semi-automatic control with precision rolling components

Applications

• Large square and rectangular structural tube
• Longitudinally welded pipe and cold-formed steel for metallurgy, construction, transportation, machinery, and vehicles

Who This Machine Is For

• Structural tube manufacturers making large square and rectangular sections
• Producers who want to cut roller inventory and changeover time
• Manufacturers of steel for construction, machinery, and vehicle applications

Frequently Asked Questions

What sizes can it make?
Square tube from 120 × 120mm to 250 × 250mm and rectangular tube from 100 × 140mm to 200 × 300mm, with walls of 5.0 to 12.0mm.

What does "no need to change roller" mean?
The line uses combined rollers, so one set of rollers can produce dozens of square and rectangular sizes without swapping roll sets.

How is it different from a round-to-square mill?
It forms the square or rectangular section directly, which Teneng says gives a smaller inner radius, straighter edges, and a cleaner profile, and reduces roll wear.

What steel can it run?
Low carbon steel and low alloy steel coil, up to Q355.

What is the warranty and delivery time?
The warranty is two years, excluding spare parts and man-made damage. Delivery takes about six months.

How long a tube can it make, and how accurately?
Lengths of 6 to 12m, with a length tolerance of ±2mm.

Is financing or staged payment available?
Yes. A deposit secures your order and begins production, with the remaining balance due only once your machine has been built, inspected, and is ready to ship.

Should I buy new or used?
This line is available new, built to order.