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High-chromium alloy mill liners are advanced wear components widely used in ball mills, rod mills, SAG mills, AG mills, and other grinding equipment across mining, cement, metallurgy, quarrying, and solid waste recycling industries. Engineered from high-chromium white cast iron with optimized alloying ratios, these liners are specifically designed to withstand extreme abrasion, compression, and continuous heavy loads in harsh grinding environments. With exceptional hardness, stable microstructure, and outstanding wear performance, high-chromium liners have become the preferred choice for industrial operations seeking long service life, reduced downtime, and lower total cost of ownership.
Manufactured with a chromium content ranging from 10% to 28%, our liners feature M7C3 eutectic carbides (HV 1300–1800) uniformly dispersed within a martensitic matrix, delivering industry-leading wear resistance for large-scale cement and mining operations. Customizable to match mill dimensions and operating conditions, these liners provide tailored wear solutions for a broad spectrum of applications.
With chromium grades from Cr10 to Cr26, the liners achieve a hardness exceeding 58 HRC, offering up to 50% higher wear resistance compared to conventional Cr-Mo alloy liners. The broken network carbide structure minimizes matrix spalling, ensuring consistent performance even under continuous abrasion.
High chromium content—up to 26%—enhances oxidation resistance, enabling stable operation in environments up to 600°C. Low sulfur and phosphorus levels (below 0.1%) provide strong corrosion resistance, making these liners suitable for wet milling applications involving mineral slurries.
Available in grades Cr10 through Cr26, the liners are designed for rod mills, ball mills, AG mills, SAG mills, and TBM machinery. Custom thicknesses ranging from 15 mm to 80 mm are offered, ensuring compatibility with both domestic and imported mill brands.
Material and Manufacturing Excellence
The core advantage of high-chromium alloy liners lies in their unique microstructure. Typically containing 15% to 28% chromium, the alloy forms massive, stable M7C3 carbides uniformly distributed within the matrix, delivering exceptional resistance to abrasive wear. The addition of molybdenum, nickel, and copper further improves hardenability, impact toughness, and corrosion resistance, ensuring the liners maintain high performance without brittle fracture.
Through precise heat treatment—including quenching and tempering—the liners achieve a hardness of 58–65 HRC, far exceeding traditional manganese steel and carbon steel alternatives. This exceptional hardness translates into a service life three to five times longer under highly abrasive conditions, making them ideal for processing hard ores such as iron ore, copper ore, gold ore, granite, and basalt.
Structurally, high-chromium alloy liners adopt segmented and modular designs for ease of installation, disassembly, and replacement. High-precision casting and machining ensure tight dimensional tolerances, providing a perfect fit with mill shells and eliminating abnormal vibration, material leakage, or eccentric wear. Optimized liner surface profiles enhance material flow and grinding efficiency, promoting uniform particle size distribution and higher production output. The strong corrosion resistance of high-chromium alloy also ensures reliable operation in wet grinding environments, effectively resisting oxidation and chemical erosion.
Parameter | Cr12 Grade | Cr26 Grade |
Chromium Content | CR>10 | 23.0-28.0% |
Hardness | >58 HRC | >58 HRC |
Impact Strength | >4 J/cm² | >4 J/cm² |
Carbon Content | 1.5-4.5% | 1.5-4.5% |
Heat Resistance | Up to 550°C | Up to 600°C |
Wear Rate (ASTM G65) | <0.20 g | <0.18 g |
Used as shell liners in large-scale cement ball mills, grinding clinker to fine powder while withstanding 24/7 operation.
Hard Rock Mining
Ideal for SAG mills processing granite, basalt, and diabase, where high abrasion resistance reduces liner replacement frequency.
Custom liners for tunnel boring machines, protecting components from rock abrasion in construction and mining tunneling .
Conclusion
Chromium Alloy Liners offer superior wear resistance but lower impact toughness. Choose chromium liners for abrasive, low-impact applications (cement mills) and Cr-Mo liners for high-impact scenarios (SAG mill discharge sections) .
Yes. Cr26 and Cr30 grades tolerate temperatures up to 600°C, making them suitable for drying-milling combined systems in cement production .
We offer custom dimensions, hole patterns, and chromium grades based on mill drawings. Surface treatments (e.g., chromium carbide overlay) are available for extreme-wear zones .
