ASTM Grade 125-80-10 or 850-550-10 (ISO 800-10, EN-JS 1100) Cast Iron
ASTM grade 125-80-10 is austempered cast iron in the heat treated (HT) condition. 125-80-10 is the ASTM designation for this material. 800-10 is the ISO numeric designation. It has the second lowest strength and second highest ductility compared to the other variants of austempered cast iron.
The graph bars on the material properties cards below compare ASTM grade 125-80-10 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
290
Compressive (Crushing) Strength
1300 MPa 190 x 103 psi
Elastic (Young's, Tensile) Modulus
180 GPa 26 x 106 psi
Elongation at Break
11 %
Fracture Toughness
62 MPa-m1/2 56 x 103 psi-in1/2
Poisson's Ratio
0.29
Shear Modulus
65 GPa 9.4 x 106 psi
Shear Strength
720 MPa 100 x 103 psi
Tensile Strength: Ultimate (UTS)
920 MPa 130 x 103 psi
Tensile Strength: Yield (Proof)
590 MPa 86 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)
85 MJ/m3
Resilience: Unit (Modulus of Resilience)
980 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
34 points
Strength to Weight: Bending
28 points
Thermal Diffusivity
11 mm2/s
Thermal Shock Resistance
27 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
ISO 17804: Founding - Ausferritic Spheroidal Graphite Cast Irons - Classification
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