XinRuiJi High-Chromium Mill Liners Extended Service Life from 90 to 212 Days in a 600 t/d Cement Mill

A Southeast Asian cement group was replacing chamber liners on a Φ3.8×13 m ball mill every 90 days. Downtime cost per changeout: ~38 hours. They asked XinRuiJi for a liner that could survive abrasive clinker + high-impact feed end without cracking.

Engineering route

XinRuiJi’s foundry (Wuxi Witdge base) reviewed the wear map: feed-end impact zone vs. middle grinding zone vs. discharge scrub zone. One-material-fits-all was rejected.

· Feed end: 26% Cr cast iron with higher toughness, controlled eutectic carbide network

· Middle/Discharge: 28–30% Cr, lower Si, optimized heat treatment for martensitic matrix

· Mold: shell mold for lifting/lifter profiles; lost foam for curved end liners to avoid draft-angle trimming

· Melting: induction furnace, degassed, slag-free pour, pour temp window ±15 °C

· Inspection: hardness map (HRC 58–62), UT for soundness, bolt-hole position FAI

Outcome

First campaign lasted 212 days​ (vs. 90). Liner weight was reduced 6% by rib redesign, keeping mill load stable. The client expanded the order to a second mill and later to a mine SAG feed chute.

XinRuiJi’s liner program is built on the same 2500 t/y foundry that ships 70%+ of output to US/Japan/Germany, so the same ASTM/EN traceability applies to a $3k liner set and a $40k grate package.

Why it works for overseas buyers

· Alloy certificate + dimension report in English

· Trial batch 1–2 pcs accepted for reverse-engineering old worn liner

· Wooden crate 900×400×100 mm standard, Shanghai FOB