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ASTM A897 Grade 3 (ASTM 175-125-4 or 1200-850-04, ISO 1200-3, EN-JS 1120) Cast Iron

ASTM A897 grade 3 is austempered cast iron in the heat treated (HT) condition. 175-125-4 is the ASTM designation for this material. 1200-3 is the ISO numeric designation. The graph bars on the material properties cards below compare ASTM A897 grade 3 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

390

Compressive (Crushing) Strength

1900 MPa 280 x 103 psi

Elastic (Young's, Tensile) Modulus

180 GPa 26 x 106 psi

Elongation at Break

4.2 %

Fracture Toughness

54 MPa-m1/2 49 x 103 psi-in1/2

Poisson's Ratio

0.29

Shear Modulus

63 GPa 9.1 x 106 psi

Shear Strength

1080 MPa 160 x 103 psi

Tensile Strength: Ultimate (UTS)

1320 MPa 190 x 103 psi

Tensile Strength: Yield (Proof)

940 MPa 140 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)

51 MJ/m3

Resilience: Unit (Modulus of Resilience)

2470 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

49 points

Strength to Weight: Bending

36 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

39 points

Alloy Composition

Iron (Fe)Fe 89.6 to 94
Carbon (C)C 3.4 to 3.8
Silicon (Si)Si 2.3 to 2.7
Nickel (Ni)Ni 0 to 2.0
Copper (Cu)Cu 0 to 0.8
Manganese (Mn)Mn 0.3 to 0.4
Molybdenum (Mo)Mo 0 to 0.3
Chromium (Cr)Cr 0 to 0.1
Vanadium (V)V 0 to 0.1
Aluminum (Al)Al 0 to 0.050
Phosphorus (P)P 0 to 0.040
Magnesium (Mg)Mg 0 to 0.040
Selenium (Se)Se 0 to 0.030
Sulfur (S)S 0 to 0.020
Tin (Sn)Sn 0 to 0.020
Arsenic (As)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