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ACI-ASTM CK35MN Cast Stainless Steel

ACI-ASTM CK35MN steel is an austenitic stainless steel formulated for casting. Cited properties are appropriate for the heat treated (HT) condition.

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 CK35MN 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

190

Elastic (Young's, Tensile) Modulus

210 GPa 30 x 106 psi

Elongation at Break

40 %

Fatigue Strength

270 MPa 39 x 103 psi

Poisson's Ratio

0.28

Shear Modulus

81 GPa 12 x 106 psi

Tensile Strength: Ultimate (UTS)

650 MPa 94 x 103 psi

Tensile Strength: Yield (Proof)

310 MPa 45 x 103 psi

Thermal Properties

Latent Heat of Fusion

310 J/g

Maximum Temperature: Corrosion

440 °C 820 °F

Maximum Temperature: Mechanical

1100 °C 2010 °F

Melting Completion (Liquidus)

1460 °C 2650 °F

Melting Onset (Solidus)

1410 °C 2570 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

12 W/m-K 7.2 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

31 % relative

Density

8.0 g/cm3 500 lb/ft3

Embodied Carbon

5.9 kg CO2/kg material

Embodied Energy

81 MJ/kg 35 x 103 BTU/lb

Embodied Water

210 L/kg 25 gal/lb

Common Calculations

PREN (Pitting Resistance)

48

Resilience: Ultimate (Unit Rupture Work)

210 MJ/m3

Resilience: Unit (Modulus of Resilience)

240 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

22 points

Strength to Weight: Bending

21 points

Thermal Diffusivity

3.3 mm2/s

Thermal Shock Resistance

14 points

Alloy Composition

Among cast stainless steels, the composition of ACI-ASTM CK35MN steel is notable for containing comparatively high amounts of molybdenum (Mo) and nickel (Ni). Molybdenum is used to facilitate tempering. In addition, it offers modest bonuses to a wide range of material properties. Nickel is primarily used to achieve a specific microstructure. In addition, it has a beneficial effect on mechanical properties and certain types of corrosion.

Iron (Fe) 43.4 to 51.8
Chromium (Cr) 22 to 24
Nickel (Ni) 20 to 22
Molybdenum (Mo) 6.0 to 6.8
Manganese (Mn) 0 to 2.0
Silicon (Si) 0 to 1.0
Nitrogen (N) 0.21 to 0.32
Copper (Cu) 0 to 0.4
Carbon (C) 0 to 0.035
Phosphorus (P) 0 to 0.035
Sulfur (S) 0 to 0.020

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

Welding Metallurgy and Weldability of Stainless Steels, John C. Lippold and Damian J. Kotecki, 2005

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