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ACI-ASTM CG6MMN (J93790) Cast Stainless Steel

ACI-ASTM CG6MMN steel is an austenitic stainless steel formulated for casting. Cited properties are appropriate for the heat treated (HT) condition. CG6MMN is the designation in both the ACI and ASTM systems for this material. J93790 is the UNS number.

It has a very high tensile strength among the cast austenitic stainless steels in the database.

The graph bars on the material properties cards below compare ACI-ASTM CG6MMN 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

200 GPa 29 x 106 psi

Elongation at Break

34 %

Fatigue Strength

260 MPa 38 x 103 psi

Poisson's Ratio

0.28

Shear Modulus

79 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

670 MPa 97 x 103 psi

Tensile Strength: Yield (Proof)

320 MPa 47 x 103 psi

Thermal Properties

Latent Heat of Fusion

300 J/g

Maximum Temperature: Corrosion

460 °C 860 °F

Maximum Temperature: Mechanical

1080 °C 1970 °F

Melting Completion (Liquidus)

1420 °C 2590 °F

Melting Onset (Solidus)

1380 °C 2510 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Expansion

17 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

22 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

4.8 kg CO2/kg material

Embodied Energy

68 MJ/kg 29 x 103 BTU/lb

Embodied Water

180 L/kg 22 gal/lb

Common Calculations

PREN (Pitting Resistance)

34

Resilience: Ultimate (Unit Rupture Work)

190 MJ/m3

Resilience: Unit (Modulus of Resilience)

260 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 Shock Resistance

14 points

Alloy Composition

Among cast stainless steels, the composition of ACI-ASTM CG6MMN steel is notable for including vanadium (V) and containing a comparatively high amount of manganese (Mn). Vanadium has a strong hardening effect, but this effect is particularly sensitive to the type of tempering. Manganese is used to improve ductility at elevated temperatures. It also permits a higher nitrogen content than would otherwise be possible.

Iron (Fe) 51.9 to 62.1
Chromium (Cr) 20.5 to 23.5
Nickel (Ni) 11.5 to 13.5
Manganese (Mn) 4.0 to 6.0
Molybdenum (Mo) 1.5 to 3.0
Silicon (Si) 0 to 1.0
Nitrogen (N) 0.2 to 0.4
Niobium (Nb) 0.1 to 0.3
Vanadium (V) 0.1 to 0.3
Carbon (C) 0 to 0.060
Phosphorus (P) 0 to 0.040
Sulfur (S) 0 to 0.030

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 of Stainless Steels, Erich Folkhard et al., 2012

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