For SAG, AG, ball and rod mill liner systems and selected impact crusher parts under moderate impact. Material families and parts are matched to the application; the grade and properties depend on drawings, operating conditions, section thickness and heat treatment records.
Alloying and heat treatment give chrome-moly steel good hardenability, helping to achieve a consistent microstructure and hardness profile in thick castings. Martensitic wear steel places greater emphasis on high hardness and wear resistance under controlled impact. Both may suit some of the same parts, but their grades, hardness requirements and heat treatments are not interchangeable.
Liners at different positions in the same mill face different conditions. Review the role of each candidate material in the liner system before checking drawings, part numbers and grades.
Check mill diameter, speed, ball charge, ore size, installation position and maximum casting section.
A material used for SAG liners is not automatically a substitute: grinding media, speed, geometry and impact levels differ.
Large feed, tramp metal and severe impact require a separate assessment; martensitic steel is not a universal choice for blow bars.
Use this table to prepare an inquiry so engineers can assess candidate material families and manufacturing methods.
| Installation Position / Part | Main Loads and Failure Modes | Required Material Properties | Required Information |
|---|---|---|---|
| Shell Liners and Lifters | Grinding ball and ore impacts, sliding and rolling wear, and cyclic bending. | Hardenability through thick sections, impact resistance, consistent wear resistance and casting integrity. | Liner drawings, section thickness, hole positions, lifter angle, mill conditions and failure photographs. |
| Feed and Discharge End Liners | Ore impact, slurry erosion, edge wear and installation stresses. | Toughness, erosion resistance, crack resistance around holes and uniform heat treatment. | Installation drawings, feed and discharge direction, thickness, fastening method and current material. |
| Discharge Grate | Slurry erosion, slot wear, bending and local stress concentrations. | A balance of wear and fracture resistance, with a stable microstructure around slots and section transitions. | Slot width, open area, minimum section thickness, support arrangement and blockage or fracture records. |
| Pulp Lifters and Discharge Cones | High-velocity slurry erosion, particle wear, and fatigue at bolt holes and connections. | Erosion resistance, toughness around holes, dimensional stability and maintainability. | Flow direction, solids concentration, speed, connection dimensions and wear distribution. |
| Impact Crusher Blow Bars / Impact Liners | High-speed impact, bending, abrasion and tramp metal risk. | Martensitic wear resistance combined with toughness for controlled impact conditions. | Feed size, material hardness, rotor speed, tramp metal history and mounting arrangement. |
The same alloy name does not ensure the same finished properties. Acceptance must cover the combined effects of material, heat treatment, defect control and dimensions.
Check drawings, technical specifications, heat chemistry and material traceability; a marketing name does not replace an engineering grade.
Record austenitising, quenching and tempering. For thick sections, focus on cooling capability and microstructural uniformity.
Check hardness distribution, mechanical properties, microstructure and UT/MT as agreed; define inspection coverage according to part risk.
Check profile, hole spacing, contact surfaces, weight and templates. Liner systems also require checks of adjacent parts and installation clearances.
Follow the equipment and part links to check known OEM drawing numbers, spare part numbers, applicable models and inquiry requirements.
Other Alloy Steel Applications: Gears, pinions, girth gears, main shafts, sprockets and fasteners may also use alloy steel, but their primary role is load carrying or power transmission. Select these materials separately for load, fatigue, carburising or quenching and tempering, and fit requirements, rather than treating them as chrome-moly mill liner applications.
Please provide the equipment model, part number or drawing, installation position, current material, maximum section thickness, handled material, failure photographs, quantity and target service life.
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Equipment and part identification, drawing review, material selection and manufacturing feasibility assessment.
Match requirements with suitable manufacturers in China and coordinate the exchange of technical information.
Drawing confirmation, material and process control, production tracking, inspection and acceptance coordination.
Coordinate manufacturing, quality confirmation, packaging and delivery of complete finished parts.
Provide the existing model, drawings, drawing or part numbers, materials or operating conditions so we can identify the appropriate technical review and supply route.
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