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ACI-ASTM CD3MN (ASTM A890 Grade 4A, J92205) Cast Stainless Steel

ACI-ASTM CD3MN steel is a duplex stainless steel formulated for casting. Cited properties are appropriate for the normalized and tempered condition. CD3MN is the designation in both the ACI and ASTM systems for this material. ASTM A890 Grade 4A is the ASTM designation. And J92205 is the UNS number.

The graph bars on the material properties cards below compare ACI-ASTM CD3MN steel to: cast duplex 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

Elastic (Young's, Tensile) Modulus

200 GPa 29 x 106 psi

Elongation at Break

29 %

Fatigue Strength

340 MPa 50 x 103 psi

Poisson's Ratio

0.27

Shear Modulus

79 GPa 12 x 106 psi

Tensile Strength: Ultimate (UTS)

710 MPa 100 x 103 psi

Tensile Strength: Yield (Proof)

460 MPa 67 x 103 psi

Thermal Properties

Latent Heat of Fusion

300 J/g

Maximum Temperature: Corrosion

430 °C 810 °F

Maximum Temperature: Mechanical

1060 °C 1950 °F

Melting Completion (Liquidus)

1450 °C 2630 °F

Melting Onset (Solidus)

1400 °C 2550 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

16 W/m-K 9.2 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.2 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.5 % IACS

Otherwise Unclassified Properties

Base Metal Price

18 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

3.6 kg CO2/kg material

Embodied Energy

50 MJ/kg 21 x 103 BTU/lb

Embodied Water

160 L/kg 19 gal/lb

Common Calculations

PREN (Pitting Resistance)

35

Resilience: Ultimate (Unit Rupture Work)

180 MJ/m3

Resilience: Unit (Modulus of Resilience)

530 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

25 points

Strength to Weight: Bending

23 points

Thermal Diffusivity

4.3 mm2/s

Thermal Shock Resistance

20 points

Alloy Composition

Among cast stainless steels, the composition of ACI-ASTM CD3MN steel is notable for including copper (Cu) and containing a comparatively high amount of chromium (Cr). Copper is primarily used to improve resistance to acids. Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance.

Iron (Fe) 62.6 to 71.9
Chromium (Cr) 21 to 23.5
Nickel (Ni) 4.5 to 6.5
Molybdenum (Mo) 2.5 to 3.5
Manganese (Mn) 0 to 1.5
Silicon (Si) 0 to 1.0
Copper (Cu) 0 to 1.0
Nitrogen (N) 0.1 to 0.3
Phosphorus (P) 0 to 0.040
Carbon (C) 0 to 0.030
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 A890: Standard Specification for Castings, Iron-Chromium-Nickel-Molybdenum Corrosion-Resistant, Duplex (Austenitic/Ferritic) for General Application

Duplex Stainless Steels, Iris Alvarez-Armas and Suzanne Degallaix-Moreuil (editors), 2009

Duplex Stainless Steels: Microstructure, Properties and Applications, Robert N. Gunn (editor), 1997

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

Corrosion of Stainless Steels, A. John Sedriks, 1996

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

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