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Round vs Push-Square Configurations on an HF ERW Welded Pipe Mill
Table of Contents
1. Selection map
- Round delivery — primary product is round OD; sizing for round; use the round equipment page
- Push-square delivery — weld round, then Turk-head / push-square into SHS/RHS; dedicated speed/power sheet on the square page
- Direct-form square (DFT) — strip → square blank → weld (no round intermediate) — third family, not this package’s recommended push-square sheet
Buyers should select round or square/rectangular as distinct rating paths — not as one averaged power quote.
2. Comparison
| Topic | Round-focused | Push-square |
|---|---|---|
| Product mix | Round primary | Square/rect primary; round still possible on many mills |
| Extra station | Sizing for round | Push / Turk-head after weld & cool |
| Tooling story | OD series rolls | Often adjustable Turk head across a size band |
| Power table | HG76-class bands | 114 push-square bands — do not merge |
3. Reference bands (confirm tier)
| Configuration | Speed reference | Total installed reference |
|---|---|---|
| HG76-class round | About 30–80 or 60–90 m/min | About 560 kW |
| 114 push-square | About 50–80 m/min | About 940 kW |
These bands illustrate separation — they are not a license to invent a mid-point “universal ERW” rating.
4. Direct-form square note
Industry comparisons position DFT for high-volume dedicated square/rect with different corner thickness behavior and tooling investment. If the buyer asks for DFT, treat it as a separate engineering path — do not answer with push-square installed-power alone.
5. Inquiry checklist
- Share of round vs square / rect in the product mix
- Size bands (OD vs square corners) and wall thickness
- Push-square vs DFT preference
- Named proposal tier for each shape that will be quoted
6. Buyer FAQ
Which sheet if I need both round and square?
Clarify share of each product and whether Turk-head push-square is in the BOM. Keep each shape’s power table on its own page.
Can I average 560 and 940 kW?
No. Averaging invents a rating that matches neither the round nor the push-square sheet.
Is push-square the same as DFT?
No. Push-square welds round then reshapes; DFT forms square before welding.
Where do process details live?
Shared flow on the pipe-flow page; HF / flying saw on the station page; equipment ratings on round or square pages.
Selection Q — no invented merged speed table. Price and lead time are out of scope.