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ASTM A148 Grade 135-125 or 930-860 (D51250) Cast Steel

ASTM A148 grade 135-125 is a type of ASTM A148 cast steel. Cited properties are appropriate for the normalized and tempered condition. ASTM A148 Grade 135-125 is the ASTM designation for this material. D51250 is the UNS number.

The graph bars on the material properties cards below compare ASTM A148 grade 135-125 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


Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

10 %

Fatigue Strength

590 MPa 86 x 103 psi

Poisson's Ratio


Reduction in Area

25 %

Shear Modulus

73 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

1060 MPa 150 x 103 psi

Tensile Strength: Yield (Proof)

960 MPa 140 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


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)

110 MJ/m3

Resilience: Unit (Modulus of Resilience)

2470 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

38 points

Strength to Weight: Bending

29 points

Thermal Diffusivity

10 mm2/s

Thermal Shock Resistance

31 points

Alloy Composition

Iron (Fe) 96.1 to 98.2
Manganese (Mn) 0.6 to 1.0
Chromium (Cr) 0.4 to 0.8
Nickel (Ni) 0.4 to 0.8
Carbon (C) 0.25 to 0.35
Silicon (Si) 0 to 0.6
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