ASTM A532 Class II Type D: High-Chromium White Iron for Extreme Abrasion
ASTM A532 · Published: 2026-06-03 · Updated: July 2026
ASTM A532 Class II Type D (20% Cr, 2% Mo) high-chromium white iron achieves 600-700 BHN hardness through a microstructure of M₇C₃ chromium carbides in a martensitic matrix. It is specified for slurry pump impellers, mill liners, chute liners, and...
ASTM A532 Class II Type D (20% Cr, 2% Mo) high-chromium white iron achieves 600-700 BHN hardness through a microstructure of M₇C₃ chromium carbides in a martensitic matrix. It is specified for slurry pump impellers, mill liners, chute liners, and shot blast machine components where abrasive wear is the sole design criterion.
Quick Facts
| Category | Cast Iron |
| Standard | ASTM A532 |
| Density | 7.50 g/cm³ |
| Yield Strength | N/A (brittle) |
| Tensile Strength | 350-500 MPa |
Global Equivalents & Cross-Reference
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Frequently Asked Questions
Can high-chromium white iron be machined?
No — at 600-700 BHN, white iron is harder than most cutting tools. Parts must be cast to near-net shape and finished by grinding only. Design features requiring machining (keyways, threaded holes) must be accommodated through cast-in inserts or by designing around the limitation. This is the fundamental tradeoff for extreme abrasion resistance.
References & International Standards
- ASTM International. Standard Specifications for Steel & Metal Alloys. astm.org
- International Organization for Standardization (ISO). Metallic Materials — Cross-Reference Database. iso.org
- American Iron and Steel Institute (AISI). Steel Grade Designations & Equivalents. steel.org
- European Committee for Standardization (CEN). EN Steel Standards & Numbering System. cencenelec.eu