ASTM A536 100-70-03 Ductile Iron

ASTM A536 / 100-70-03. A536 100-70-03 is the highest-strength common ductile iron grade (~690 MPa / 100 ksi), used for heavy-duty, wear-resistant gears and dies.

Chemical composition (nominal wt %)

Element%
Carbon (C)3.5–3.8
Silicon (Si)2.2–2.7
Manganese (Mn)≤0.6
Magnesium (Mg)0.03–0.05

Mechanical properties

PropertyValue
Tensile strength689 MPa (100 ksi) min
Yield strength483 MPa (70 ksi) min
Elongation3% min
Hardness217–302 HB

Density: 7.15 g/cm³  ·  Heat treatment: Normalized or quench-and-tempered for maximum strength and hardness.

Cross-standard equivalents

StandardEquivalent grade
EN / ISOEN-GJS-700-2
GBQT700-2
JISFCD700
DIN (old)GGG70

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

Typical applications

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FAQ

What is the strongest grade of ductile iron?

Among common ASTM A536 grades, 100-70-03 and 120-90-02 are the strongest (≥100 ksi tensile), trading ductility for strength and hardness in heavy-duty wear applications.