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ACI-ASTM CK3MCuN (1.4593, J93254) Cast Stainless Steel

ACI-ASTM CK3MCuN steel is an austenitic stainless steel formulated for casting. Cited properties are appropriate for the heat treated (HT) condition. CK3MCuN is the designation in both the ACI and ASTM systems for this material. 1.4593 is the EN numeric designation. And J93254 is the UNS number.

It has a moderately low thermal conductivity among cast austenitic stainless steels. In addition, it has a fairly high tensile strength and a moderately high ductility.

The graph bars on the material properties cards below compare ACI-ASTM CK3MCuN steel to: cast austenitic stainless 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

180

Elastic (Young's, Tensile) Modulus

200 GPa 30 x 106 psi

Elongation at Break

39 %

Fatigue Strength

250 MPa 36 x 103 psi

Poisson's Ratio

0.28

Shear Modulus

80 GPa 12 x 106 psi

Tensile Strength: Ultimate (UTS)

620 MPa 89 x 103 psi

Tensile Strength: Yield (Proof)

290 MPa 42 x 103 psi

Thermal Properties

Latent Heat of Fusion

300 J/g

Maximum Temperature: Corrosion

420 °C 800 °F

Maximum Temperature: Mechanical

1090 °C 2000 °F

Melting Completion (Liquidus)

1460 °C 2670 °F

Melting Onset (Solidus)

1350 °C 2460 °F

Specific Heat Capacity

460 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

12 W/m-K 6.9 BTU/h-ft-°F

Thermal Expansion

16 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

1.9 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.1 % IACS

Otherwise Unclassified Properties

Base Metal Price

29 % relative

Density

8.0 g/cm3 500 lb/ft3

Embodied Carbon

5.6 kg CO2/kg material

Embodied Energy

76 MJ/kg 33 x 103 BTU/lb

Embodied Water

190 L/kg 23 gal/lb

Common Calculations

PREN (Pitting Resistance)

45

Resilience: Ultimate (Unit Rupture Work)

200 MJ/m3

Resilience: Unit (Modulus of Resilience)

210 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

21 points

Strength to Weight: Bending

20 points

Thermal Diffusivity

3.2 mm2/s

Thermal Shock Resistance

14 points

Alloy Composition

Among cast stainless steels, the composition of ACI-ASTM CK3MCuN steel is notable for containing a comparatively high amount of molybdenum (Mo) and including copper (Cu). Molybdenum is used to facilitate tempering. In addition, it offers modest bonuses to a wide range of material properties. Copper is primarily used to improve resistance to acids.

Iron (Fe) 49.5 to 56.3
Chromium (Cr) 19.5 to 20.5
Nickel (Ni) 17.5 to 19.5
Molybdenum (Mo) 6.0 to 7.0
Copper (Cu) 0.5 to 1.0
Manganese (Mn) 0 to 1.2
Silicon (Si) 0 to 1.0
Nitrogen (N) 0.18 to 0.24
Phosphorus (P) 0 to 0.045
Carbon (C) 0 to 0.025
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 A743: Standard Specification for Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application

Corrosion of Austenitic Stainless Steels: Mechanism, Mitigation and Monitoring, H. S. Khatak and B. Raj (editors), 2002

Austenitic Stainless Steels: Microstructure and Mechanical Properties, P. Marshall, 1984

ASM Specialty Handbook: Stainless Steels, J. R. Davis (editor), 1994

Advances in Stainless Steels, Baldev Raj et al. (editors), 2010

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015