ASTM A536 80-55-06 Ductile Iron

ASTM A536 / 80-55-06. A536 80-55-06 is a higher-strength pearlitic ductile iron (~550 MPa / 80 ksi) used for gears, crankshafts and heavily loaded machinery parts.

Chemical composition (nominal wt %)

Element%
Carbon (C)3.5–3.8
Silicon (Si)2.2–2.7
Manganese (Mn)≤0.5
Magnesium (Mg)0.03–0.05

Mechanical properties

PropertyValue
Tensile strength552 MPa (80 ksi) min
Yield strength379 MPa (55 ksi) min
Elongation6% min
Hardness187–255 HB

Density: 7.1 g/cm³  ·  Heat treatment: As-cast or normalized to develop a pearlitic matrix for higher strength.

Cross-standard equivalents

StandardEquivalent grade
EN / ISOEN-GJS-550-5
GBQT550-5
JISFCD550
DIN (old)GGG55

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

Typical applications

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FAQ

What is A536 80-55-06 used for?

It is a higher-strength pearlitic ductile iron for gears, crankshafts and heavily loaded machinery where strength and wear resistance matter more than maximum ductility.