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High-Frequency ERW Welded Pipe Mill (Round / Square Configurations)
Table of Contents
- Definition
- Reference configuration (HG76 class)
- Shared process route
- Boundaries
- Inquiry checklist
- Buyer FAQ
- References
1. Definition
An HF ERW round pipe mill turns strip coil into longitudinally welded round tube: dual-station decoil → shear & end-weld → accumulator → form & size → solid-state high-frequency weld → scarf / cool → flying saw → run-out / pack. HF current heats strip edges (skin / proximity effect); squeeze rolls forge the seam without filler metal.
This page locks the round rating tables. Push-square / rectangular sizing and its power sheet live on the ERW-SQUARE entry — do not merge the two.
2. Reference configuration (HG76 class)
| Item | Reference (do not lock one band) |
|---|---|
| Speed | EN sheet ~30–80 m/min; CN sheet ~60–90 m/min — both valid by proposal |
| Main / HF / installed | CN 76: main ~200 kW (AC/DC option); HF ~250 kW; installed ~560 kW. EN list may cite F5-200 kW-class HF — size-dependent |
| OD / wall | EN ~φ20–89 / ~1.0–3.5 mm; CN ~φ42–76 / ~0.8–3.0 mm; strip width ~130–300 mm |
| Forming note | W-type forming common; horizontal rolls driven, vertical guiding |
Series siblings (32 / 50 / 60 / 89 …) change OD and installed power — do not paste a larger mill’s kW into HG76. Do not paste 114 push-square ~940 kW into this round sheet.
3. Shared process route
- Decoiler and strip-end shear welding
- Accumulator / loop storage
- Forming
- High-frequency welding, burr treatment, cooling
- Sizing and straightening (round OD)
- Flying saw cut-off and discharge
4. Boundaries
- Not spiral SAW pipe
- Not the push-square recommended sheet (see ERW-SQUARE)
- Not a scaffolding-only leaf unless that scope is listed
- CN title/body may mix HG76 / 50×100 labels — read the named technical proposal
5. Inquiry checklist
- Round OD range and wall thickness
- Steel grade and strip width band
- Speed tier (EN 30–80 vs CN 60–90 wording)
- HF power class and installed-power scope
- Whether square output is also required (then open the square page separately)
6. Buyer FAQ
Can one mill make square too?
Many round mills can size square after weld, but dedicated push-square ratings and process are documented on the square page — do not merge power tables.
Which speed is correct — 30–80 or 60–90?
Both appear in source sheets. Name the proposal language / tier; do not invent an average.
Is 560 kW universal for all ERW?
No. About 560 kW is the HG76-class round installed reference. Push-square 114 cites a different total.
Is this spiral pipe?
No. This is longitudinal HF ERW, not spiral submerged-arc.
Final ratings follow the named round pipe-mill proposal. Price and lead time are out of scope.
References
- 13-WELDED-PIPE FAQ: ERW-ROUND
- Industry context: HF/ERW process overview
- Related: WIKI-N-ERW-SQUARE (separate ratings); process-flow entries