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ACI-ASTM CD4MCuN (ASTM A890 Grade 1B, J93372) Cast Stainless Steel

ACI-ASTM CD4MCuN steel is a duplex stainless steel formulated for casting. Cited properties are appropriate for the normalized and tempered condition. CD4MCuN is the designation in both the ACI and ASTM systems for this material. ASTM A890 Grade 1B is the ASTM designation. And J93372 is the UNS number.

It has a moderately low ductility and a moderately high tensile strength among cast duplex stainless steels.

The graph bars on the material properties cards below compare ACI-ASTM CD4MCuN 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

18 %

Fatigue Strength

340 MPa 50 x 103 psi

Poisson's Ratio

0.27

Shear Modulus

79 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

770 MPa 110 x 103 psi

Tensile Strength: Yield (Proof)

550 MPa 80 x 103 psi

Thermal Properties

Latent Heat of Fusion

300 J/g

Maximum Temperature: Corrosion

450 °C 840 °F

Maximum Temperature: Mechanical

1100 °C 2010 °F

Melting Completion (Liquidus)

1420 °C 2600 °F

Melting Onset (Solidus)

1380 °C 2520 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

17 W/m-K 9.6 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

3.5 kg CO2/kg material

Embodied Energy

49 MJ/kg 21 x 103 BTU/lb

Embodied Water

180 L/kg 21 gal/lb

Common Calculations

PREN (Pitting Resistance)

35

Resilience: Ultimate (Unit Rupture Work)

130 MJ/m3

Resilience: Unit (Modulus of Resilience)

760 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

28 points

Strength to Weight: Bending

24 points

Thermal Diffusivity

4.5 mm2/s

Thermal Shock Resistance

21 points

Alloy Composition

Among cast stainless steels, the composition of ACI-ASTM CD4MCuN steel is notable for containing a comparatively high amount of chromium (Cr) and including copper (Cu). Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance. Copper is primarily used to improve resistance to acids.

Iron (Fe) 59.5 to 66.3
Chromium (Cr) 24.5 to 26.5
Nickel (Ni) 4.7 to 6.0
Copper (Cu) 2.7 to 3.3
Molybdenum (Mo) 1.7 to 2.3
Manganese (Mn) 0 to 1.0
Silicon (Si) 0 to 1.0
Nitrogen (N) 0.1 to 0.25
Carbon (C) 0 to 0.040
Phosphorus (P) 0 to 0.040
Sulfur (S) 0 to 0.040

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 of Stainless Steels, Erich Folkhard et al., 2012

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

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