ASTM A436 Type 2 (L-NiCr 20 2, F41002) Cast Iron
ASTM A436 type 2 is a type of austenitic grey cast iron. Cited properties are appropriate for the stress relieved condition. ASTM A436 Type 2 is the ASTM designation for this material. F41002 is the UNS number. Additionally, the British Standard (BS) designation is F2. And the AFNOR (French) designation is FGL Ni20 Cr2.
The graph bars on the material properties cards below compare ASTM A436 type 2 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
150
Elastic (Young's, Tensile) Modulus
180 GPa 27 x 106 psi
Elongation at Break
9.4 %
Poisson's Ratio
0.29
Shear Modulus
71 GPa 10 x 106 psi
Tensile Strength: Ultimate (UTS)
190 MPa 28 x 103 psi
Tensile Strength: Yield (Proof)
100 MPa 15 x 103 psi
Thermal Properties
Latent Heat of Fusion
290 J/g
Melting Completion (Liquidus)
1400 °C 2540 °F
Melting Onset (Solidus)
1350 °C 2470 °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
15 % relative
Density
7.8 g/cm3 490 lb/ft3
Embodied Carbon
3.4 kg CO2/kg material
Embodied Energy
47 MJ/kg 20 x 103 BTU/lb
Embodied Water
93 L/kg 11 gal/lb
Common Calculations
PREN (Pitting Resistance)
2.0
Resilience: Ultimate (Unit Rupture Work)
15 MJ/m3
Resilience: Unit (Modulus of Resilience)
29 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
6.8 points
Strength to Weight: Bending
9.4 points
Thermal Shock Resistance
5.5 points
Alloy Composition
| Fe | 67.6 to 79 | |
| Ni | 18 to 22 | |
| Cr | 1.5 to 2.5 | |
| Si | 1.0 to 2.8 | |
| C | 0 to 3.0 | |
| Mn | 0.5 to 1.5 | |
| Cu | 0 to 0.5 | |
| S | 0 to 0.12 |
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
ISO 2892: Austenitic Cast Irons - Classification
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