ASTM A897 Grade 5 (ASTM 230-185-01 or 1600-1300-01) Cast Iron
ASTM A897 grade 5 is austempered cast iron in the heat treated (HT) condition. It has the highest strength and lowest ductility compared to the other variants of austempered cast iron. The graph bars on the material properties cards below compare ASTM A897 grade 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
490
Elastic (Young's, Tensile) Modulus
180 GPa 26 x 106 psi
Elongation at Break
1.1 %
Poisson's Ratio
0.29
Shear Modulus
69 GPa 10 x 106 psi
Tensile Strength: Ultimate (UTS)
1800 MPa 260 x 103 psi
Tensile Strength: Yield (Proof)
1460 MPa 210 x 103 psi
Thermal Properties
Latent Heat of Fusion
280 J/g
Melting Completion (Liquidus)
1380 °C 2520 °F
Melting Onset (Solidus)
1340 °C 2450 °F
Specific Heat Capacity
490 J/kg-K 0.12 BTU/lb-°F
Thermal Conductivity
42 W/m-K 24 BTU/h-ft-°F
Thermal Expansion
13 µm/m-K
Otherwise Unclassified Properties
Base Metal Price
2.9 % relative
Density
7.5 g/cm3 470 lb/ft3
Embodied Carbon
1.8 kg CO2/kg material
Embodied Energy
25 MJ/kg 11 x 103 BTU/lb
Embodied Water
48 L/kg 5.7 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
19 MJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
66 points
Strength to Weight: Bending
44 points
Thermal Diffusivity
11 mm2/s
Thermal Shock Resistance
53 points
Alloy Composition
| Fe | 89.6 to 94 | |
| C | 3.4 to 3.8 | |
| Si | 2.3 to 2.7 | |
| Ni | 0 to 2.0 | |
| Cu | 0 to 0.8 | |
| Mn | 0.3 to 0.4 | |
| Mo | 0 to 0.3 | |
| Cr | 0 to 0.1 | |
| V | 0 to 0.1 | |
| Al | 0 to 0.050 | |
| P | 0 to 0.040 | |
| Mg | 0 to 0.040 | |
| Se | 0 to 0.030 | |
| S | 0 to 0.020 | |
| Sn | 0 to 0.020 | |
| As | 0 to 0.020 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
ASTM A897: Standard Specification for Austempered Ductile 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