Premature Roll Wear and Dimensional Drift
Roll and shaft wear is the hidden cost of tube production: as shafts wear, the pass opens up and OD, roundness and weld quality drift until the mill must stop for re-roll. Mills with soft shaft material face frequent, expensive re-tooling and inconsistent output.
Why Roll Shafts Wear Out Quickly
Ordinary shaft steel deforms and wears under continuous rolling pressure and heat, especially on the high-load forming and sizing stands. Once the pass profile shifts, every tube drifts out of tolerance, and frequent roll changes raise downtime and tooling cost.
The ZY20 Durable Tube Mill Solution
Forming and sizing stands use 42CrMo roll shaft material, quenched, tempered and high-frequency hardened, for high wear resistance and a stable pass profile.
Overload-protected horizontal stands protect rolls and the drive train under abnormal load, reducing the risk of shaft and roll damage.
Side-pull quick-change frames simplify roll replacement when it is eventually needed, cutting maintenance downtime.
Technical Specifications of the ZY20 Tube Mill
| Parameter | Specification |
|---|
| Tube outside diameter | φ10–26 mm |
| Wall thickness | 0.4–1.5 mm |
| Rated production speed | up to 90 m/min |
| Raw material | HR / CR low-carbon steel, galvanized steel |
| HF welder power | 100 kW solid-state |
| Forming stands | 5 rough + 3 finish |
| Sizing stands | 6 horizontal + 6 vertical |
| Leveling rolls | 7-roll precision leveler |
| Cut length / precision | 4–8 m, ±3 mm |
| Coolant flow | ≥10 t/h spray + overflow pool |
| Roll shaft material | 42CrMo quenched & tempered + HF hardened |
Complete Continuous Production Process
Every ZY20 runs one continuous flow from coil to finished cut tube. An uncoiler feeds strip through a 7-roll precision leveler that removes coil-set, then double-radius forming shapes it in 5 rough and 3 finish stands without edge wave. A 100 kW solid-state HF welder fuses the seam under squeeze pressure with a dedicated seam guide, and an automatic outside-burr unit clears the bead immediately. ≥10 t/h spray plus overflow-pool cooling locks the shape, the 6-horizontal + 6-vertical sizing train sets the diameter, and a 4-roll Turk head straightens the tube before the microcomputer flying saw cuts 4–8m lengths to ±3mm. Overload-protected stands and 42CrMo hardened shafts keep the whole line stable over long runs.
Where the ZY20 Durable Tube Mill Is Applied
Continuous, high-volume tube production where roll shaft life and dimensional stability directly determine output quality and operating cost.
How to Select a Durable Tube Mill
Ask for the roll shaft material and heat treatment — the ZY20 uses 42CrMo with quenching and high-frequency hardening. Check overload protection and quick-change design to keep maintenance short.
Installation, Support and After-Sales
The ZY20 ships as a turnkey package with layout and foundation drawings so you can prepare the site before delivery. Engineer-led on-site installation and commissioning bring the line to rated output, with operator training to hand over a running mill. A one-year warranty with spare-parts support protects the investment, and because the line accepts HR, CR and galvanized coil, you can adapt to changing material costs and market demand without re-tooling.
Frequently Asked Questions About the ZY20 Durable Tube Mill
What material are the roll shafts?
42CrMo, quenched, tempered and high-frequency hardened for wear resistance.
How are rolls protected from overload?
Horizontal forming stands carry overload protection to shield rolls and the drive train.
How are rolls replaced?
Side-pull quick-change frames let operators swap rolls without dismantling adjacent stands.
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