ASTM A571 Type D-2M Class 2 or 4 Cast Iron
ASTM A571 type D-2M class 2 is a type of austenitic nodular cast iron. Cited properties are appropriate for the annealed condition. It has the second highest ductility compared to the other variants of austenitic nodular cast iron.
The graph bars on the material properties cards below compare ASTM A571 type D-2M class 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
140
Elastic (Young's, Tensile) Modulus
180 GPa 26 x 106 psi
Elongation at Break
29 %
Impact Strength: V-Notched Charpy
31 J 23 ft-lb
Poisson's Ratio
0.3
Shear Modulus
70 GPa 10 x 106 psi
Tensile Strength: Ultimate (UTS)
470 MPa 69 x 103 psi
Tensile Strength: Yield (Proof)
190 MPa 28 x 103 psi
Thermal Properties
Latent Heat of Fusion
280 J/g
Melting Completion (Liquidus)
1370 °C 2500 °F
Melting Onset (Solidus)
1330 °C 2420 °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
3.7 kg CO2/kg material
Embodied Energy
51 MJ/kg 22 x 103 BTU/lb
Embodied Water
94 L/kg 11 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
110 MJ/m3
Resilience: Unit (Modulus of Resilience)
100 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
17 points
Strength to Weight: Bending
17 points
Thermal Shock Resistance
14 points
Alloy Composition
| Fe | 65.8 to 71.6 | |
| Ni | 21 to 24 | |
| Mn | 3.8 to 4.5 | |
| C | 2.2 to 2.9 | |
| Si | 1.5 to 2.5 | |
| Cr | 0 to 0.2 | |
| P | 0 to 0.080 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM A571: Standard Specification for Austenitic Ductile Iron Castings for Pressure-Containing Parts Suitable for Low-Temperature Service
Cast Iron: Physical and Engineering Properties, Harold T. Angus, 1976
Microstructure of Steels and Cast Irons, Madeleine Durand-Charre, 2004
Ferrous Materials: Steel and Cast Iron, Hans Berns and Werner Theisen, 2008