ASTM A536 60-40-18 Ductile Iron

ASTM A536 / 60-40-18. A536 60-40-18 is a ferritic ductile iron with the highest ductility in common use (~18% elongation), chosen for pressure-retaining and impact-loaded parts.

Chemical composition (nominal wt %)

Element%
Carbon (C)3.5–3.9
Silicon (Si)2.5–2.8
Manganese (Mn)≤0.3
Magnesium (Mg)0.03–0.05

Mechanical properties

PropertyValue
Tensile strength414 MPa (60 ksi) min
Yield strength276 MPa (40 ksi) min
Elongation18% min
Hardness143–187 HB

Density: 7.1 g/cm³  ·  Heat treatment: Annealed (ferritic) for maximum ductility and impact toughness.

Cross-standard equivalents

StandardEquivalent grade
EN / ISOEN-GJS-400-18
GBQT400-18
JISFCD400
DIN (old)GGG40

Equivalents by nominal class — confirm exact chemistry & spec for critical parts.

Typical applications

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FAQ

What is the difference between A536 60-40-18 and 65-45-12?

60-40-18 is a softer, ferritic grade with higher elongation (18%) for ductility and impact resistance; 65-45-12 is slightly stronger (65 ksi) with 12% elongation for general structural use. Choose 60-40-18 for pressure/impact, 65-45-12 for general bodies.