ASTM A536 Grade 65-45-12: Ferritic Ductile Iron with Maximum Ductility
ASTM A536 · Published: 2026-06-03 · Updated: July 2026
ASTM A536 Grade 65-45-12 is a ferritic ductile iron optimized for maximum ductility — the 12% minimum elongation makes it suitable for components requiring impact resistance and machinability. It is used for automotive steering knuckles,...
ASTM A536 Grade 65-45-12 is a ferritic ductile iron optimized for maximum ductility — the 12% minimum elongation makes it suitable for components requiring impact resistance and machinability. It is used for automotive steering knuckles, suspension control arms, gear housings, and valve bodies where casting complexity and moderate strength are required.
Quick Facts
| Category | Cast Iron |
| Standard | ASTM A536 |
| Density | 7.10 g/cm³ |
| Yield Strength | 310 MPa (45 ksi) |
| Tensile Strength | 448 MPa (65 ksi) |
Global Equivalents & Cross-Reference
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Frequently Asked Questions
What's the difference between ductile iron and gray cast iron?
Ductile iron contains magnesium that causes graphite to form as spheroids (nodules) rather than flakes. This spheroidal graphite shape eliminates the stress-concentrating effect of flakes, giving ductile iron approximately 2-3× the tensile strength and 10× the ductility of gray iron. Ductile iron bridges the gap between gray iron and cast steel.
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