Problem
Hot rolled strip carries mill scale and wider thickness variation, which wears rollers, disturbs the weld gap and leaves surface defects that are hard to hide on finished tube.
Cause
Mill scale is abrasive and increases roll wear, while HR strip thickness can vary more than cold rolled, so the weld edge gap and forming geometry shift along the coil length and cause intermittent weld defects.
Solution
The ZY16 feeds HR strip through a seven-roller leveler to flatten crown and remove edge wave before forming, and the 42CrMo shafts plus double-radius rollers tolerate scale-related loading. The staged forming keeps the weld gap consistent despite HR thickness variation, so the mill converts economical HR coil into sound Φ8-18mm tube.
Key Engineering Data
- Seven-roller leveler flattens HR crown and edge wave before forming.
- 42CrMo shafts resist scale-related abrasive wear.
- Staged forming holds the weld gap stable across HR thickness variation.
- Accepts economical hot rolled coil to lower input material cost.
| Parameter | Specification |
|---|
| Mill Model | ZY16 |
| Tube OD Range | Φ8-18 mm |
| Wall Thickness | 0.4-1.0 mm |
| Strip Width Range | 25-57 mm |
| Max Line Speed | 90 m/min |
| HF Welder Power | 100 kW Solid-State High Frequency |
| Strip Material | Hot Rolled / Cold Rolled / Galvanized Steel |
| Uncoiler | Double-Mandrel Pneumatic, 1.5-Ton Coil Capacity |
| Accumulator | 200 m/min High-Speed Cage |
| Strip Leveling | Seven-Roller Leveling Unit |
| Forming Stands | 5-Stand Rough + 3-Stand Precision |
| Roller Geometry | Double-Radius Forming Rollers |
| Roller Shafts | 42CrMo High-Strength Alloy Steel |
| Safety | Forming Stand Overload Protection |
Performance & Quality
Running hot rolled strip, the ZY16 keeps the weld gap stable despite HR thickness variation because the seven-roller leveler flattens the strip and staged forming spreads the load. The 42CrMo shafts resist scale wear, so the mill converts economical HR coil into sound Φ8-18mm tube with fewer rejects.
Application
For structural and general-purpose Φ8-18mm welded tube made from hot rolled strip, such as fencing, scaffolding and general mechanical tube where cost per ton is the priority.
Selection Guide
Choose this mill when you plan to run hot rolled strip. Specify HR strip in your order so roller gaps and leveling pressure are set for scale and thickness tolerance rather than for cold rolled precision strip.
Application Scenarios
Fence and gate tube, general structural tube, racking and storage tube, and cost-sensitive mechanical tube produced from hot rolled coil.
FAQ
Q1. Can the ZY16 handle mill scale on hot rolled strip?
Yes, the seven-roller leveler conditions the strip and the 42CrMo roller shafts resist scale-related wear during forming, so HR coil runs reliably.
Q2. Does HR thickness variation cause weld problems?
The staged forming plus constant-tension accumulator keeps the weld gap stable across the coil, minimizing the intermittent weld defects that HR thickness variation causes.
Q3. Do I need different rollers for hot rolled strip?
Roller gaps and leveling pressure are set for HR strip; tell us your material so we configure the tooling accordingly rather than using cold rolled settings.
Q4. Is hot rolled tube surface as clean as cold rolled?
No, HR tube keeps a hot rolled surface, so it suits structural and coated applications rather than bright-finish requirements.
Q5. Is hot rolled tube cheaper to produce?
Yes, HR strip costs less than cold rolled, and the ZY16 handles its scale and thickness variation, so you get lower input cost per ton of tube.
Q6. What is the typical roller life on HR strip?
Roller life depends on volume, but HR scale wears rollers faster than CR strip; the 42CrMo shafts help keep alignment stable and extend service life.
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