A532 Class II Casting Parts — High-Chromium White Iron Wear Castings for Mining and Heavy Industry

SMI supplies casting parts manufactured to ASTM A532 Class II specification — high-chromium white iron castings for wear-critical applications in mining, aggregate processing, cement production and heavy material handling. ASTM A532 Class II is a recognised international standard for abrasion-resistant cast irons, specifying high-chromium white iron compositions typically in the 15–25% chromium range, with hardness values that make it the material of choice for the most demanding wear environments in heavy industry.

SMI does not produce the A532 material itself — we manufacture precision castings to this specification, applying controlled casting practice, heat treatment and dimensional inspection to produce parts that meet the mechanical and geometric requirements of each application. Custom dimensions, configurations and surface treatments are available.

Material — ASTM A532 Class II High-Chromium White Iron

ASTM A532 is the standard specification for abrasion-resistant cast irons. Class II within this standard covers high-chromium white iron compositions, characterised by:

• Chromium content typically in the 15–25% range — forming hard chromium carbides in the microstructure that provide the primary wear resistance mechanism
• Very high hardness — typically 600–800 HV depending on composition and heat treatment
• Excellent abrasion resistance under high-stress grinding and impact-abrasion conditions
• Good corrosion resistance relative to other wear-resistant materials, relevant in wet processing environments
• Suitable for heat treatment to optimise the balance of hardness and toughness for the specific application

The European equivalent designation is the DIN GX260Cr27 family — high-chromium cast irons with chromium content around 27% and hardness typically ≥500 HB. SMI has manufacturing experience with both ASTM and DIN specification high-chromium white iron castings, and can produce to customer-specified standards where required.

Applications

Crusher Wear Parts

High-chromium white iron is the standard material specification for wear-critical components in gyratory, cone and jaw crushers — including crusher liners, mantles, concaves and blow bars. The combination of high hardness and chromium carbide microstructure resists the abrasive wear generated by rock and ore crushing at high compressive loads.

Grinding Mill Liners

Ball mill and SAG mill liners in mining and cement operations are among the highest-wear components in mineral processing. A532 Class II castings provide the abrasion resistance required for extended liner service life in high-throughput grinding applications.

Material Handling Wear Parts

Slurry pump wet-end components — impellers, volute liners, throatbushes — operate in highly abrasive slurry environments where high-chromium white iron provides significantly longer service life than standard cast iron or carbon steel alternatives. Chute liners, deflector plates and impact wear surfaces in bulk material handling systems are further applications.

Heavy-Duty Industrial Components

Additional applications include roller press rolls and wear segments, excavator wear parts, and other high-load, high-impact components where the abrasion resistance of high-chromium white iron is the determining material selection criterion.

Manufacturing

SMI casting parts to ASTM A532 Class II specification are produced under controlled manufacturing conditions covering:

• Material composition control — charge calculation and melt chemistry verification to meet A532 Class II compositional requirements
• Casting practice — pattern design, gating and risering configured for the specific part geometry to minimise shrinkage, porosity and inclusion defects
• Heat treatment — destabilisation and sub-critical heat treatment to optimise the hardness and toughness balance for the intended service conditions
• Dimensional inspection — full dimensional check against drawing or customer specification before despatch
• Hardness verification — Brinell hardness testing to confirm heat treatment result

Specifications

Global Supply

SMI A532 Class II casting parts are in active service across mining, aggregate and cement operations in multiple continents, including supply to some of the world’s largest mining and mineral processing groups. All supply relationships are subject to confidentiality agreements. Reference accounts are available to qualified buyers under appropriate confidentiality terms.

Mine Components — Specialist Crusher Wear Parts and Mining Equipment

For detailed technical information on crusher wear parts, grinding mill liners and material handling wear components — including full product specifications, dimensional data and application engineering support — please visit SMI’s dedicated mining components platform:

minecomponents.com →

Related Products

• Crusher Wear Parts — minecomponents.com
• Contact SMI — Wear Casting Enquiry

Request a Quotation

To enquire about A532 Class II casting parts for your application, please provide the following:

• Part name and function — crusher liner, mill liner, pump component, other
• Current material specification — existing drawing or material standard
• Dimensions and weight — drawing preferred; sketch with key dimensions acceptable
• Annual consumption volume
• Industry and equipment type
• Current service life and target improvement

SMI will respond with a written technical assessment and commercial proposal. Contact SMI — A532 Class II Casting Parts Enquiry →