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Square / Rectangular Configuration of an HF ERW Welded Pipe Mill (Push-Square)
Table of Contents
- Definition
- Reference configuration (114 push-square)
- Stations in order
- Why push-square
- Inquiry checklist
- Buyer FAQ
1. Definition
Push-square (round-to-square / Turk-head style) forms and HF-welds a round tube first, then reshapes it with a passive push-square / multi-roll Turk head into square or rectangular hollow section before flying-saw cut-off.
This page locks the square / rectangular rating tables. It is not direct-form square (DFT) and not the round-only HG76 recommended sheet. Round OD speed / power live on the ERW-ROUND entry — do not paste them here.
2. Reference configuration (114 push-square)
| Item | Reference |
|---|---|
| Speed | About 50–80 m/min (series selection tables may show other bands — do not merge) |
| Drive / HF / installed | Main ~160 + 200 kW (AC/DC options); HF ~400 kW; installed ~940 kW — size-dependent |
| Square / wall / width | ~40×40–90×90 mm (and matching rectangles); wall ~2.0–4.5 mm; strip ~160–360 mm |
Larger 165 / 219 push-square and HG32/50/76/127 selection-table rows are series variants — not this 114 unique truth. Do not treat 940 kW as universal across every square quote.
3. Stations in order
- Decoiler and shear welding
- Accumulator
- Forming and HF welding
- Burr removal, cooling, rough sizing
- Push-square sizing
- Flying saw, run-out, bundling
4. Why push-square
Documented advantages of passive push-square include lower surface scratching vs aggressive driven squaring, more stable diagonal control vs crude “round then mash,” and tooling flexibility across a size band. Direct-form square is a different investment story — see the round-vs-push-square Q page.
5. Inquiry checklist
- Square / rectangular size band and wall thickness
- Whether round output is also required on the same mill
- Push-square vs DFT preference
- Named size class (114 vs larger siblings)
- Voltage / frequency and packing needs
6. Buyer FAQ
Same ratings as round HG76?
No. Round cites ~30–80 / 60–90 m/min and ~560 kW class. This 114 push-square sheet uses ~50–80 m/min and ~940 kW — keep tables separate.
Is this direct-form square?
No. Push-square welds round first, then Turk-head reshapes. DFT is a third family.
Can I reuse round HF ~250 kW here?
No. The 114 push-square reference cites HF about 400 kW class — confirm on the named proposal.
Are 40×40–90×90 universal?
No. That is the 114 reference band. Larger series rows differ — name the size class.
Final ratings follow the named push-square proposal. Price and lead time are out of scope.