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ASTM A436 Type 5 (F41006) Cast Iron

ASTM A436 type 5 is a type of austenitic grey cast iron. Cited properties are appropriate for the stress relieved condition. ASTM A436 Type 5 is the ASTM designation for this material. F41006 is the UNS number. Additionally, the AFNOR (French) designation is FGL Ni35.

It has the lowest strength and highest ductility compared to the other variants of austenitic grey cast iron.

The graph bars on the material properties cards below compare ASTM A436 type 5 to: cast irons (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Brinell Hardness


Elastic (Young's, Tensile) Modulus

180 GPa 27 x 106 psi

Elongation at Break

20 %

Poisson's Ratio


Shear Modulus

70 GPa 10 x 106 psi

Tensile Strength: Ultimate (UTS)

150 MPa 22 x 103 psi

Tensile Strength: Yield (Proof)

84 MPa 12 x 103 psi

Thermal Properties

Latent Heat of Fusion

280 J/g

Melting Completion (Liquidus)

1390 °C 2540 °F

Melting Onset (Solidus)

1350 °C 2460 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Expansion

13 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

24 % relative


8.1 g/cm3 500 lb/ft3

Embodied Carbon

4.7 kg CO2/kg material

Embodied Energy

65 MJ/kg 28 x 103 BTU/lb

Embodied Water

110 L/kg 13 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

26 MJ/m3

Resilience: Unit (Modulus of Resilience)

19 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

23 points

Strength to Weight: Axial

5.3 points

Strength to Weight: Bending

7.9 points

Thermal Shock Resistance

4.5 points

Alloy Composition

Iron (Fe)Fe 57.4 to 64.5
Nickel (Ni)Ni 34 to 36
Silicon (Si)Si 1.0 to 2.0
Carbon (C)C 0 to 2.4
Manganese (Mn)Mn 0.5 to 1.5
Copper (Cu)Cu 0 to 0.5
Sulfur (S)S 0 to 0.12
Chromium (Cr)Cr 0 to 0.1

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM A436: Standard Specification for Austenitic Gray Iron Castings

Cast Iron: Physical and Engineering Properties, Harold T. Angus, 1976

Ferrous Materials: Steel and Cast Iron, Hans Berns and Werner Theisen, 2008

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015