What the HG355 tube mill is built for
Extra large diameter heavy wall. A market where few suppliers operate: most mills stop at Ø325, which is exactly why this size is open. The HG355 covers Ø165 – Ø355 tube at 4 – 14 wall, running at 10 – 25. It sits in the HG355, HG426 & HG508 band of our range — The largest mills in our range. Pipeline and petrochemical pipe up to Ø508 mm and 18 mm wall — supplied with the heavy roll stands, the long cooling and the handling equipment that go with a line of that size.
Technical specifications
| Model | Tube OD | Wall thickness | Square / rectangular section | Line speed |
|---|---|---|---|---|
| HG355 | Ø165 – Ø355 | 4 – 14 | 130×130 – 280×280 | 10 – 25 |
Square and rectangular hollow sections from 130×130 – 280×280 are produced on the same line, which is why the forming section on this machine is wider than a round tube mill of the same diameter.
Where the output goes
This size is normally bought for a specific end market rather than for a general product range. Typical uses: Large diameter API pipe, petrochemical and process pipe, heavy wall pipeline.
The mill is supplied as a complete line, and you tell us the product mix you intend to run. That decides the number of forming stands, the HF power rating, the sizing pass layout and whether the cut-off is a hot saw, a cold flying saw or both. Guessing here is what makes an expensive line underperform, so we quote against your actual tube specification rather than against a catalogue.
How the line is configured
- Entry — decoiler, hold-down and straightening, sized to your coil weight and diameter.
- Coil joining — hydraulic shearing and butt welding, so the strip reaches the mill continuously.
- Accumulator — the buffer that lets the mill run while the welder changes a coil.
- Forming and welding — the HG355 forming section, HF welder sized for 4 wall, and the cooling box.
- Sizing and straightening — sizing stands and Turkish head rolls that hold the finished OD.
- Cut-off and handling — flying saw cut-off, run-out table, and optional automatic stacking and strapping.
All tube mill models
Every model we build, in order of diameter. If you are not sure which band fits your product, send us the tube OD and wall you want to sell and we will tell you which model covers it.
| Model | Tube OD (mm) | Wall thickness (mm) | Square section (mm) | Line speed (m/min) |
|---|---|---|---|---|
| HG16 | 8–25 | 0.25–1.0 | — | 30–120 |
| HG25 | 8–32 | 0.35–1.3 | — | 30–120 |
| HG32 | 12.7–38.1 | 0.5–1.8 | — | 30–120 |
| HG45 | 12.7–50.8 | 0.6–2.3 | — | 30–120 |
| HG50 | 19–63.5 | 0.6–2.7 | — | 30–100 |
| HG50-76 | 19–76 | 0.6–2.7 | — | 30–100 |
| HG50-95 | 25–95 | 0.7–2.5 | — | 30–90 |
| HG60 | 19–76 | 0.8–3.5 | — | 30–90 |
| HG60-102 | 25–102 | 0.8–3.0 | — | 30–80 |
| HG76 | 25–95 | 1.0–4.0 | — | 30–70 |
| HG76-127 | 38–127 | 1.2–4.0 | — | 30–70 |
| HG89 | 38–102 | 1.2–4.5 | — | 20–60 |
| HG89-127 | 38–127 | 1.2–4.5 | — | 20–60 |
| HG89-140 | 50.8–140 | 1.2–4.5 | — | 20–60 |
| HG114 | 50.8–127 | 1.5–5.0 | — | 20–60 |
| HG114-165 | 76–165 | 2.0–5.0 | — | 20–60 |
| HG165 | 76–165 | 2.0–6.0 | — | 15–50 |
| HG219 | 114–219 | 2–8 | 90×90 – 170×170 | 15–40 |
| HG273 | 114–273 | 3–10 | 90×90 – 200×200 | 15–30 |
| HG325 | 165–325 | 3–12 | 130×130 – 250×250 | 15–30 |
| HG355 | 165–355 | 4–14 | 130×130 – 280×280 | 10–25 |
| HG426 | 219–426 | 4–16 | 170×170 – 300×300 | 10–20 |
| HG508 | 219–508 | 4–18 | 170×170 – 400×400 | 10–20 |
Questions buyers ask about the HG355
What tube sizes can the HG355 produce?
The HG355 covers Ø165 – Ø355 round tube at 4 – 14 wall. Square and rectangular hollow section from 130×130 – 280×280 can be produced on the same line. The exact size range you can hold to tolerance depends on the material grade and the strip width you run.
How fast does the line run?
Rated at 10 – 25. Actual output depends on wall thickness, grade and diameter; the heaviest wall in the range runs at the lower end of that figure.
What strip do I need to run this mill?
The mill takes cold rolled or galvanised strip. Send us your grade, thickness and width and we will confirm the roll pass design and the strip width calculation for your product.
Can this mill be configured for square tube?
Yes. The forming section is widened for square and rectangular section, and the sizing and Turkish head layout is redesigned for the corners. That is a build decision taken at quotation, not an option added later.
Do you supply the whole line or only the mill?
We supply the complete line — entry, coil joining, accumulator, forming and welding, sizing, cut-off and handling — and we quote it station by station so you can see where the money goes.
How long does delivery and installation take?
Delivery, commissioning and operator training are scheduled with the order. Tell us your target start date and we will say honestly whether the line can be there.
Related products
Tube mill rolls · Tube mill roll set · Flying cold saw · Tube mill spare parts
Send us the tube you want to make
OD, wall, grade and monthly output is enough for us to quote the HG355 against your product. You will get a station-by-station proposal and a real price, not a catalogue page.
