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ASTM A148 Grade 105-85 or 725-585 (D50850) Cast Steel

ASTM A148 grade 105-85 is a type of ASTM A148 cast steel. Cited properties are appropriate for the normalized condition. ASTM A148 Grade 105-85 is the ASTM designation for this material. D50850 is the UNS number.

The graph bars on the material properties cards below compare ASTM A148 grade 105-85 to: cast alloy steels (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

250

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

19 %

Fatigue Strength

450 MPa 65 x 103 psi

Poisson's Ratio

0.29

Reduction in Area

39 %

Shear Modulus

73 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

830 MPa 120 x 103 psi

Tensile Strength: Yield (Proof)

660 MPa 95 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

420 °C 780 °F

Melting Completion (Liquidus)

1460 °C 2660 °F

Melting Onset (Solidus)

1420 °C 2580 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

39 W/m-K 22 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.4 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.5 % IACS

Otherwise Unclassified Properties

Base Metal Price

2.7 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

1.5 kg CO2/kg material

Embodied Energy

20 MJ/kg 8.8 x 103 BTU/lb

Embodied Water

50 L/kg 6.0 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

150 MJ/m3

Resilience: Unit (Modulus of Resilience)

1140 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

29 points

Strength to Weight: Bending

25 points

Thermal Diffusivity

10 mm2/s

Thermal Shock Resistance

24 points

Alloy Composition

Iron (Fe) 96.2 to 98.3
Manganese (Mn) 0.6 to 0.9
Chromium (Cr) 0.4 to 0.8
Nickel (Ni) 0.4 to 0.8
Silicon (Si) 0 to 0.6
Carbon (C) 0.2 to 0.3
Molybdenum (Mo) 0.15 to 0.3
Sulfur (S) 0 to 0.060
Phosphorus (P) 0 to 0.050

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM A148: Standard Specification for Steel Castings, High Strength, for Structural Purposes

Properties and Selection: Irons, Steels and High Performance Alloys, ASM Handbook vol. 1, ASM International, 1993

Manufacture and Uses of Alloy Steels, Henry D. Hibbard, 2005

Ferrous Materials: Steel and Cast Iron, Hans Berns and Werner Theisen, 2008

Steels: Processing, Structure, and Performance, 2nd ed., George Krauss, 2015