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ASTM A217 Grade C12A Cast Cr-Mo-V Steel

ASTM A217 grade C12A is a type of ASTM A217 cast steel. Cited properties are appropriate for the normalized and tempered condition. The graph bars on the material properties cards below compare ASTM A217 grade C12A 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

200

Elastic (Young's, Tensile) Modulus

190 GPa 28 x 106 psi

Elongation at Break

21 %

Fatigue Strength

320 MPa 47 x 103 psi

Poisson's Ratio

0.28

Reduction in Area

50 %

Shear Modulus

75 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

670 MPa 98 x 103 psi

Tensile Strength: Yield (Proof)

460 MPa 67 x 103 psi

Thermal Properties

Latent Heat of Fusion

270 J/g

Maximum Temperature: Mechanical

600 °C 1100 °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

26 W/m-K 15 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

8.9 % IACS

Electrical Conductivity: Equal Weight (Specific)

10 % IACS

Otherwise Unclassified Properties

Base Metal Price

7.0 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

2.1 kg CO2/kg material

Embodied Energy

28 MJ/kg 12 x 103 BTU/lb

Embodied Water

87 L/kg 10 gal/lb

Common Calculations

PREN (Pitting Resistance)

13

Resilience: Ultimate (Unit Rupture Work)

120 MJ/m3

Resilience: Unit (Modulus of Resilience)

560 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

24 points

Strength to Weight: Bending

22 points

Thermal Diffusivity

6.9 mm2/s

Thermal Shock Resistance

19 points

Alloy Composition

Iron (Fe) 87.6 to 90.5
Chromium (Cr) 8.0 to 9.5
Molybdenum (Mo) 0.85 to 1.1
Manganese (Mn) 0.3 to 0.6
Silicon (Si) 0.2 to 0.5
Nickel (Ni) 0 to 0.4
Carbon (C) 0.080 to 0.12
Niobium (Nb) 0.060 to 0.1
Nitrogen (N) 0.030 to 0.070
Phosphorus (P) 0 to 0.030
Sulfur (S) 0 to 0.010

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

Followup Questions

Similar Alloys

Further Reading

ASTM A217: Standard Specification for Steel Castings, Martensitic Stainless and Alloy, for Pressure-Containing Parts, Suitable for High-Temperature Service

Pressure Vessels: External Pressure Technology, 2nd ed., Carl T. F. Ross, 2011

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