SAG mill liners take the same impact energy as the balls but over a much larger area, so the alloy has to balance work-hardening toughness with abrasion resistance. Grindium casts shell liners, feed end liners, discharge end liners and lifter bars in Mn13Cr2, Mn18Cr2, Cr-Mo and high chrome Cr26, from 30 kg to 6 t per piece.
Liners are pattern-made from your mill drawing or from a worn liner sample. We check the bolt hole pattern, the lifter profile and the gap between plates before casting, so the set fits the first time without on-site grinding.
Material selection
Material
Hardness
Impact
Best for
Mn13Cr2
HB 180-220 (work hardens to 450+)
Very high
Feed end and high-impact zones
Mn18Cr2
HB 180-220 (work hardens to 500+)
Very high
Large SAG mills, coarse ore
Cr-Mo steel
HB 300-380
Medium
Shell liners in abrasive ore
High chrome Cr26
HRC 58-62
Medium
Discharge grates, low-impact abrasion
Composite (steel + ceramic)
HRC 60+ at wear face
High
Long-life shell liner sets
What we cast
Shell liners with lifter bars, wave or step profile
Feed end liners and head liners
Discharge end liners and grate plates
Trunnion liners and pulp lifters
Bolts, washers and seal rings as a set
Tolerance and inspection
Dimensional check against drawing, bolt holes +/-1.5 mm
Ultrasonic inspection on thick sections above 80 mm
Hardness tested on every piece, recorded per heat number
Pattern kept for repeat orders – no re-tooling cost on the second set
Packing and delivery
Item
Packing
Typical lead time
Shell liner set
Steel frame crate, 20-25 t per 40 ft
35-45 days
End liners
Plywood crate, 20 t per 20 ft
30-40 days
Grate plates
Plywood crate, 24 t per 40 ft
30-40 days
Send the mill model, drawing PDF or a photo of the worn liner and we will quote a full set with bolts. Request a liner quotation.
