ASTM A536 65-45-12 Ductile Iron: Nodular Cast Iron
ASTM A536 · Updated: 2026-05-25
ASTM A536 Grade 65-45-12 is a ferritic ductile (nodular) cast iron featuring spheroidal graphite nodules in a predominantly ferrite matrix, delivering 65 ksi (448 MPa) minimum tensile, 45 ksi (310 MPa) yield, and 12% minimum elongation. Magnesium treatment during casting produces the spheroidal graphite—eliminating the stress-concentrating flakes of gray iron and providing ductility approaching steel at lower cost. Widely used for automotive suspension components, pump housings, valve bodies, and pipe fittings. Machines readily, dampens vibration better than steel, and can be austempered (ADI) for enhanced strength.
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
| Alternative Standard / Grade | Action |
|---|---|
| EN-GJS-450-10 | Compare |
| ISO 1083 450-10 | Compare |
| FCD450 | Compare |
| GGG-45 | Compare |
| JS 450-10 | Compare |
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Frequently Asked Questions
How does ductile iron differ from gray cast iron?
Ductile iron's spheroidal graphite gives it 2-3× tensile strength, 5-10× ductility, and significantly better impact resistance than gray iron's flake graphite. Gray iron excels at vibration damping and thermal conductivity; ductile iron excels where toughness and tensile strength are required. Engine blocks use gray iron; suspension control arms use ductile iron.