ASTM Grade 70-50-05 (ISO 500-7, EN-JS 1050) Ductile Cast Iron
ASTM grade 70-50-05 is ductile cast iron in the as-fabricated (no temper or treatment) condition. 70-50-05 is the ASTM designation for this material. 500-7 is the ISO numeric designation. The graph bars on the material properties cards below compare ASTM grade 70-50-05 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
200
Elastic (Young's, Tensile) Modulus
180 GPa 26 x 106 psi
Elongation at Break
6.1 %
Fracture Toughness
25 MPa-m1/2 23 x 103 psi-in1/2
Poisson's Ratio
0.29
Shear Modulus
70 GPa 10 x 106 psi
Shear Strength
450 MPa 65 x 103 psi
Tensile Strength: Ultimate (UTS)
530 MPa 78 x 103 psi
Tensile Strength: Yield (Proof)
370 MPa 53 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
35 W/m-K 20 BTU/h-ft-°F
Thermal Expansion
11 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
7.4 % IACS
Electrical Conductivity: Equal Weight (Specific)
9.4 % IACS
Otherwise Unclassified Properties
Base Metal Price
1.9 % relative
Density
7.1 g/cm3 440 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)
29 MJ/m3
Resilience: Unit (Modulus of Resilience)
380 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
26 points
Strength to Weight: Axial
21 points
Strength to Weight: Bending
21 points
Thermal Diffusivity
10 mm2/s
Thermal Shock Resistance
19 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