Home › Tube Mill › Large-Diameter Tube Mill › HG273
The eighth of the twelve model steps — Φ114 – Φ273 mm round pipe and 90×90 – 215×215 mm square section, on a 600 kW high-frequency welder.
Model Steps
In This Line
The HG273 tube mill is a Φ114–273 mm tube mill for round pipe with 4.0–10.0 mm wall and square pipe from 90×90 to 215×215 mm, welded by a 600 kW high-frequency welder. It is the third line in our large-diameter group.
Line Specification — HG273×10.0
| Round tube outside diameter | Φ114 – Φ273 mm |
|---|---|
| Wall thickness | 4.0 – 10.0 mm |
| High-frequency welder | 600 kW |
| Square / rectangular tube | Square 90×90 – 215×215 mm; wall 4.0 – 9.5 mm |
Watch This Line Running
HG273 High-Frequency Welded Pipe Mill — O.D. 114-273 mm
HG273 Tube Mill Specifications
- Outside diameter range: Φ114–273 mm.
- Wall thickness: 4.0–10.0 mm for round pipe; 4.0–9.5 mm for square pipe.
- Section shapes: round, square and rectangular.
- Forming: conventional roll forming.
- Welding: high-frequency induction, with a 600 kW welder.
- Automation: semi-automatic or full PLC.
Line speed and shift output depend on wall thickness, steel grade and cut length, so we confirm both at quotation once you send us your pipe size, material grade and cut length.
Pipe in this size range goes mainly into construction and structural work — most of our deliveries at these sizes are construction tube — and it is also used for low-pressure water and gas lines.
What a Tube Mill for 273mm Pipe Includes
As a tube mill for 273mm pipe, the HG273 line is built from the following units, from coil entry to finished pipe:
- Coil car, carrying the coil from the loading position onto the uncoiler.
- Uncoiler with a pneumatic four-link expanding mandrel.
- Strip-head opener, guiding the coil head smoothly into the line.
- Pinch leveller with five rollers, flattening the strip before forming.
- Automatic shear-welder, joining strip end to strip end so the line keeps running between coils.
- Spiral accumulator, storing strip while the next coil is prepared.
- Forming and sizing mill.
- 600 kW high-frequency welder.
- Flying saw, cutting to length while pipe is delivered continuously.
- Run-out table, carrying the finished pipe to the collecting table.
- PLC and variable-frequency control tying speed and cut length together.
Wear Parts and Consumables
Saw blades wear with cutting volume, and impeders and induction coils wear with welding hours; both are wear parts we keep supplying. Forming and sizing rolls are replaced as they wear and are machined in-house, so replacements stay available. We specify the cooling medium and hydraulic oil, and the plant buys them locally.
Size Change, Roll Wear and Yield
On the Φ114–273 mm tube mill, a size change means changing the roll set. This line uses FFX forming, a variant of W forming in which the rolls of the open forming section are shared across sizes and stay on the mill, so part of the set is never changed and roll cost comes down. Roll sets at this diameter are the heaviest in the conventional forming range, so a size change is the largest planned stoppage on the line.
Roll material and heat treatment decide how long the set holds diameter before regrinding.
After a size change, PLC and variable-frequency drive control keep line speed and cut length repeatable from batch to batch, instead of leaving them to the operator.
On some of our higher-specification lines, material yield can reach 93 per cent; the yield actually achieved on any line also depends on the buyer’s scheduling and operating practice.
Where the Φ114–273 mm Tube Mill Sits in the Series
HG273 is the eighth of twelve models. It shares its Φ114 mm starting point with the HG219 (Φ114–219 mm) and overlaps the HG165 (Φ60–165 mm) from Φ114 to 165 mm; above it, the HG325 (Φ165–325 mm) covers from Φ165 mm. Wall thickness separates them: this line runs 4.0–10.0 mm, against 3.0–7.0 mm on the HG165, 4.0–8.0 mm on the HG219 and 4.0–10.0 mm on the HG325. So a Φ114–273 mm tube mill is the line for walls above 8.0 mm below Φ219 mm and for diameters from Φ219 to 273 mm, while the HG325 takes the same walls on to Φ325 mm.
Where Our Lines Are Running
Our lines have gone to 25 countries — most make construction tube, and others run fire-extinguisher tube, furniture tube and other sections. In this size range: Pakistan and Mexico (127 × 6), Mexico (HG114 × 4), Afghanistan (165 × 5), Thailand (165 × 6), Russia (HG165 × 6), Kyrgyzstan (HG168 × 5), South Korea (254 × 8) and Kenya (150 × 150 × 6) for construction tube, and Russia (168 × 7) for fire-extinguisher tube.
Delivery, installation and support
The line is dismantled into units and shipped in containers: heavy frames are braced and secured, while precision parts and wear items travel in wooden cases together with a spare-parts pack. Shipment is within 90 working days of the deposit.
Installation and commissioning are guided on site by our engineers, with online support behind them; the buyer provides the installation crew and covers the engineers’ travel, lodging and daily allowance. Our after-sales team handles enquiries.
Payment is staged — 30% by T/T on signing, 65% by T/T before shipment and 5% after installation and commissioning — or made by L/C at sight; prices are quoted ex-works (EXW).
When the Pipe Needs an Inspection Record
If your pipe has to carry an inspection record, that is a job for one of our API lines rather than the HG273. In this size range the API 219 line covers Φ114–219 mm with wall 6.0–10.0 mm and the API 406 line covers Φ152–406 mm with wall 3.0–12.7 mm; both add medium-frequency annealing, straightening, hydrostatic testing, and ultrasonic and eddy-current inspection to the tube mill.
Weld Quality at This Diameter
At this diameter, fusion is set by high-frequency power and frequency matched to welding speed, with post-weld cooling matched to the same speed; diameter, straightness and ovality are set by sizing and straightening. Operator setup at each size change is a quality factor in its own right — poor setup shows up as shape drift and scrap while setting up — which is why commissioning includes training on roll changes.
Weld fusion is on the equipment side — power matching, seam alignment and squeeze control — while strip quality and operating practice are on the buyer’s.
What to send with an enquiry
Largest outside diameter, wall thickness, section shape, steel grade and target output, and whether the pipe has to carry an inspection record — that last point decides between this line and an API line. Welder power comes with the size range: on the HG273 tube mill it is 600 kW.
Line Photos from the Works
Three photographs of the HG273 tube mill, taken in our own workshop. Click any photo for the full-size image.
More from this line
HG165
HG219
HG325
HG426Send Your Enquiry
Tell us the pipe outside-diameter range, the wall thickness and the output you need. An engineer reads every enquiry — it does not land in a general sales inbox.