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High Manganese Steel Liners

Mill Liners

Our high chrome mill liners provide durable mill protection while supporting efficient media retention, material classification and discharge.

Key Specifications

Product Type: Grate liner
Material: High-chromium wear-resistant alloy
Hardness: Up to HRC 58–65 depending on alloy grade
Structure: Segmented arc design with screening slots and mounting holes

Applications

Wet Ball Mills
Dry Ball Mills
Inter-Compartment Sections
Mill Discharge Sections
Grinding Media Retention & Material Classification

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Product Description

Product Overview

This product is a high-chromium alloy liner (grate liner) featuring an arc-shaped, segmented modular structure. It is equipped with elongated screening slots and mounting bolt holes. Designed for use in the inter-compartment, discharge, and screening sections of wet or dry ball mills—and working in conjunction with grinding balls or cylpebs—it performs three key functions: material classification, retention of grinding media, and discharge of qualified fine powder.

Specification

Item	DESIGNATION	Chemicalcomposition(%)														Mechanical Propertiesof Products	Microstructure
Item	DESIGNATION			C	Si	Mn	Cr	Mo	Ni	Cu	S	P	ak（j/cm2）	HRC	ab(Wpa)		Microstructure
1	ZG30O5MnRE	0.25–0.35	0.3–1.0	0.3–1.0	4.5–5.5	0.7–1.0			≤0.045	≤0.045	≥25	≥45		M+B+C
2	ZG40O5MnRE	0.35–0.45	0.3–1.0	0.3–1.0	4.5–5.5	0.7–1.0			≤0.045	≤0.045	≥20	≥48		M+B+C
3	ZG45O3MnMnRE	0.40–0.50	0.3–0.8	0.6–1.2	2.0–3.2	0.3–0.5	0.5–1.0		≤0.04	≤0.04	≥20	≥50		M+C
4	ZG90O6MnMn	0.85–0.95	0.4–0.8	0.4–0.8	5–8	0.2–0.4			≤0.04	≤0.04	>7	>50		M+C
5	ZGMn3	1.1–1.4	0.3–1.0	1.1–1.4					≤0.06	≤0.09	>147	Hb≤229	637	A+C
6	ZGMn3O2	1.1–1.4	0.3–1.0	1.1–1.4	1.5–2.5	0–0.5			≤0.06	≤0.08	>80	≤240		A+C
7	ZGMn7O2	1.1–1.4	0.3–1.0	1.6–1.9	1.0–2.0		10.2–0.4		≤0.06	≤0.08	>50	≤260		A+C
8	ZG20O26N5	≤0.20	≤0.20	≤0.20	24–28	≤0.50	4–6		≤0.04	≤0.04	Hb≤229		590	A+F
9	ZG20O26N42	0.2–0.5	≤0.20	≤0.20	24–28	≤0.50	11–14		≤0.04	≤0.04			490	A+F
10	ZG40O25N20	0.35–0.45	≤0.20	≤0.20	23–27	≤0.50	19–22		≤0.04	≤0.04			440	A+F
11	KmTBQ15Mn2	2–2.8	≤0.10	0.5–1.0	13–18	0.2–2.5	0–1.0		≤0.06	≤0.10		≥53		M+A+C
12	KmTBQ20Mn2	2–3.0	≤0.10	0.5–1.0	18–22	1.5–2.5	0–1.5		≤0.06	≤0.10	≥3	≥58		M+A+C
13	KmTBQ26	2–3.0	≤0.10	0.5–1.0	23–28	0–1.0	0–1.5		≤0.06	≤0.10		≥55		M+A+C
A – austenitic B – bainite C – carbide F – ferrite M – martensite

Key Structural Advantages

Arc-Shaped Modular Design

Conforms to the curvature of the mill shell; individual segments are of manageable weight, allowing for installation and replacement without dismantling the entire shell, which saves time and effort during maintenance. Individual damaged segments can be replaced separately rather than the entire set, significantly reducing spare part costs and downtime.

Optimized Elongated Screening Slots

Precise control of slot width ensures only fine powder meeting specifications passes through, while retaining grinding balls, cylpebs, and coarse particles. Slot edges feature a radiused transition to prevent material jamming or clogging, ensuring smooth material flow, improving mill throughput efficiency, and reducing issues such as mill choking or overfilling.

Multi-Point Bolt Mounting Layout

Evenly distributed mounting holes ensure load dispersion, preventing loosening or edge lifting during operation and avoiding liner detachment that could damage the shell. Compatible with standard mill dimensions; hole spacing, curvature, and slot width can be customized to specific mill models.

Contoured Wear-Resistant Working Surface

The surface features a thickened wear-resistant layer that also acts as a material buffer, reducing direct impact and wear from grinding balls or cylpebs, thereby combining screening functionality with wear protection.

Material Physical Properties

High-Chromium Wear-Resistant Alloy

Cast from standard high-chromium iron, achieving a hardness of HRC 58–65. It offers superior wear and impact resistance—extending service life by 2 to 3 times compared to standard high-manganese steel liners—making it ideal for high-abrasion applications involving hard ores, cement clinker, and steel slag.

High Toughness and Fracture Resistance

Undergoes integral quenching and tempering heat treatment after casting to relieve casting stresses; withstands high-frequency impacts from steel balls and material abrasion; resists cracking and edge chipping even under low-temperature, high-impact conditions, resulting in an extremely low failure rate.

Resistance to Acidic and Alkaline Slurry Corrosion

Chromium content forms a dense, oxidation-resistant passivation layer, preventing rust and delamination in acidic or alkaline wet-processing slurries; slot widths remain stable over long-term use without widening due to corrosion, ensuring consistent classification accuracy.

High-Density, Solid Castings

Produced via metal-mold casting, the structure is free from internal defects such as gas pockets, sand holes, or porosity; uniform overall strength eliminates issues with localized rapid wear or perforation.

Manufacturing Advantages

Fully Customizable Production

Compatible with ball mills of various diameters; arc curvature, liner thickness, grate slot width, and bolt hole specifications can be freely adjusted. Supports multiple material formulations—including high-chrome, medium-chrome, and high-manganese steel—to suit coarse grinding, fine grinding, and discharge stages.

Precision Casting

Cast as a single, integrated unit; grate slots are uniform and burr-free. Ensures a tight fit against the mill shell, eliminating material leakage and preventing grinding media from migrating between chambers or leaking out.

Precision-Machined Mounting Holes

Bolt holes are precision-bored for a secure fit. No on-site re-drilling is required, significantly shortening equipment maintenance downtime.

Operational Advantages: Cost Reduction & Efficiency Gains

Extended Service Life; Reduced Spare Part Procurement

Wear resistance far exceeds that of standard high-manganese steel liners, more than doubling the replacement interval and drastically cutting procurement and warehousing costs.

Consistent Screening; Increased Mill Productivity

Resistant to clogging with stable classification performance; prevents production drops caused by mill chamber blockages. Produces uniformly sized discharge material, reducing the load on downstream separation equipment.

Protection for Mill Shell and Components

The solid liner acts as a barrier, preventing steel balls and ore from directly impacting the mill shell and protecting against wear-induced perforation. Effectively contains steel balls, preventing them from entering discharge pipes or classifiers and causing jams or equipment damage.