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ASTM A436 Type 2b (L-NiCr 20 3, F41003) Cast Iron

ASTM A436 type 2b is a type of austenitic grey cast iron. Cited properties are appropriate for the stress relieved condition. ASTM A436 Type 2b is the ASTM designation for this material. F41003 is the UNS number. Additionally, the AFNOR (French) designation is FGL Ni20 Cr3.

The graph bars on the material properties cards below compare ASTM A436 type 2b 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

210

Elastic (Young's, Tensile) Modulus

180 GPa 27 x 10⁶ psi

Elongation at Break

8.5 %

Poisson's Ratio

0.29

Shear Modulus

72 GPa 10 x 10⁶ psi

Tensile Strength: Ultimate (UTS)

230 MPa 34 x 10³ psi

Tensile Strength: Yield (Proof)

120 MPa 18 x 10³ psi

Thermal Properties

Latent Heat of Fusion

290 J/g

Melting Completion (Liquidus)

1390 °C 2540 °F

Melting Onset (Solidus)

1350 °C 2460 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Expansion

14 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

16 % relative

Density

7.8 g/cm³ 490 lb/ft³

Embodied Carbon

3.5 kg CO₂/kg material

Embodied Energy

49 MJ/kg 21 x 10³ BTU/lb

Embodied Water

100 L/kg 12 gal/lb

Common Calculations

PREN (Pitting Resistance)

4.5

Resilience: Ultimate (Unit Rupture Work)

17 MJ/m³

Resilience: Unit (Modulus of Resilience)

41 kJ/m³

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

8.2 points

Strength to Weight: Bending

11 points

Thermal Shock Resistance

6.5 points

Alloy Composition

Iron (Fe)Fe		64.1 to 77.5
Nickel (Ni)Ni		18 to 22
Chromium (Cr)Cr		3.0 to 6.0
Silicon (Si)Si		1.0 to 2.8
Carbon (C)C		0 to 3.0
Manganese (Mn)Mn		0.5 to 1.5
Copper (Cu)Cu		0 to 0.5
Sulfur (S)S		0 to 0.12