ASTM Grade 120-90-02 (ISO 800-2, EN-JS 1080) Ductile Cast Iron
ASTM grade 120-90-02 is ductile cast iron in the quenched and tempered condition. 120-90-02 is the ASTM designation for this material. 800-2 is the ISO numeric designation. Additionally, the UNS number is F36200.
It has the highest strength and lowest ductility compared to the other variants of ductile cast iron.
The graph bars on the material properties cards below compare ASTM grade 120-90-02 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
310
Elastic (Young's, Tensile) Modulus
170 GPa 25 x 106 psi
Elongation at Break
2.1 %
Fracture Toughness
14 MPa-m1/2 13 x 103 psi-in1/2
Poisson's Ratio
0.28
Shear Modulus
66 GPa 9.6 x 106 psi
Shear Strength
800 MPa 120 x 103 psi
Tensile Strength: Ultimate (UTS)
920 MPa 130 x 103 psi
Tensile Strength: Yield (Proof)
670 MPa 98 x 103 psi
Thermal Properties
Latent Heat of Fusion
270 J/g
Maximum Temperature: Mechanical
290 °C 550 °F
Melting Completion (Liquidus)
1160 °C 2120 °F
Melting Onset (Solidus)
1120 °C 2050 °F
Specific Heat Capacity
490 J/kg-K 0.12 BTU/lb-°F
Thermal Conductivity
31 W/m-K 18 BTU/h-ft-°F
Thermal Expansion
11 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
7.4 % IACS
Electrical Conductivity: Equal Weight (Specific)
9.2 % IACS
Otherwise Unclassified Properties
Base Metal Price
1.9 % relative
Density
7.2 g/cm3 450 lb/ft3
Embodied Carbon
1.5 kg CO2/kg material
Embodied Energy
21 MJ/kg 8.9 x 103 BTU/lb
Embodied Water
43 L/kg 5.1 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
17 MJ/m3
Resilience: Unit (Modulus of Resilience)
1330 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
26 points
Strength to Weight: Axial
35 points
Strength to Weight: Bending
29 points
Thermal Diffusivity
8.9 mm2/s
Thermal Shock Resistance
35 points
Alloy Composition
| Fe | 93.7 to 95.5 | |
| C | 3.0 to 3.5 | |
| Si | 1.5 to 2.8 | |
| P | 0 to 0.080 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
ISO 1083: Spheroidal Graphite Cast Irons - Classification
ASTM A536: Standard Specification for Ductile Iron Castings
ASTM A395: Standard Specification for Ferritic Ductile Iron Pressure-Retaining Castings for Use at Elevated Temperatures
Cast Iron: Physical and Engineering Properties, Harold T. Angus, 1976
Properties and Selection: Irons, Steels and High Performance Alloys, ASM Handbook vol. 1, ASM International, 1993
Ferrous Materials: Steel and Cast Iron, Hans Berns and Werner Theisen, 2008