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.
| Fe | 62.6 to 71.9 | |
| Cr | 21 to 23.5 | |
| Ni | 4.5 to 6.5 | |
| Mo | 2.5 to 3.5 | |
| Mn | 0 to 1.5 | |
| Si | 0 to 1.0 | |
| Cu | 0 to 1.0 | |
| N | 0.1 to 0.3 | |
| P | 0 to 0.040 | |
| C | 0 to 0.030 | |
| 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