AG Mill Liners
Autogenous mill liners cast in high-manganese grades that survive the full ore impact — no grinding media to cushion the charge.
What a ag liner has to survive
In an autogenous mill the ore is its own grinding medium. Nothing cushions the impact, no steel balls spread the load, and the largest rocks in the feed land directly on the liners. This is the duty that punishes hardness-first material choices: a liner that resists abrasion but cannot absorb shock will crack long before it wears out.
Where the wear actually comes from
Shell
Direct impact from large ore fragments with abrasive sliding. Cracking and spalling are more common than even wear.
Feed end
The heaviest impact point in the mill. Toughness is the governing property.
Discharge end
Abrasion and erosion where the pulp accelerates out through the grate.
Lifter bars
Highest local impact; profile shape directly affects the grinding action.
Recommended material by position
In practice the right answer is usually a mix within the same mill. This table is a starting point — your drawing and your wear history decide the final call.
| Position | Dominant wear mechanism | Recommended material |
|---|---|---|
| Shell liners | Heavy ore impact + abrasion | Mn18 / Mn18Cr2 |
| Feed-end head | Maximum impact energy | Mn13 / Mn18 |
| Discharge-end head | Erosion + abrasion | Mn18Cr2 |
| Grate plates | Pulp erosion | Cr-Mo / Mn18Cr2 |
| Lifter bars | Impact, profile-critical | Mn18 |
The complete AG liner package
Typical manufacturing envelope
- Mill diameter3.0 – 11.0 m
- Liner thickness50 – 180 mm
- Single piece weight100 – 3,000 kg
- MaterialsMn13, Mn18, Mn18Cr2, Cr-Mo
- Casting toleranceISO 8062 D1 / GB-T 6414
- Hardness range170 – 250 HB as cast
If your liner falls outside the ranges above, send the drawing anyway — we will tell you honestly whether we can cast it and how.
Send your drawing — we do the rest
What we need from you
Send the drawing and we can quote. If any of the items below are missing we will tell you what is required before the pattern is cut — the earlier the question is asked, the cheaper the answer.
- 2D drawing (DWG or PDF) or a 3D model (STEP / IGES)
- Material grade and required hardness, if specified
- Quantity per position and whether a full set or part set
- Bolt hole pattern, bolt size and grade
- Mill make, model and diameter (helps us sanity-check the drawing)
- Current liner life, if you are replacing an existing set
From drawing to documented casting
Drawing review
We check the drawing for castability, confirm the material and flag anything that would cause a problem at the foundry — before a pattern is made.
Pattern and moulding
Pattern built to your drawing with the correct shrinkage allowance for the specified grade.
Melting, casting, heat treatment
Chemistry verified by spectrometer before pouring; heat treatment logged with furnace records.
Inspection and despatch
Dimensions verified against the drawing, documentation compiled, castings crated for shipment.
Common questions
Should AG mill liners always be manganese?
Mostly, especially at the feed end and on lifter bars, where impact governs. In the discharge zone or where abrasion clearly dominates, a Cr-Mo grade can be the better economic choice. We will say so if the drawing suggests it.
Can you change the lifter profile?
We can cast a modified profile to your drawing or review a revised profile with you. Note that we manufacture to drawing — profile selection remains your call, and we will flag any castability issues before cutting the pattern.
How are large AG liners shipped?
On steel pallets or in crates with lifting points marked, blocked to prevent movement in the container. Loading photographs are sent before sealing.
Can I visit the foundry before ordering?
Yes, and we would rather you did. Tell us when you plan to travel and we will arrange the visit in Dangyang, Hubei — including inspection records for orders already in production.
Send us your drawing — get a quote within 24 hours
Upload DWG, PDF or STEP files. Our engineers review every drawing and come back with a technical reply and a firm quotation — no obligation.