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ACI-ASTM CA6N (J91650) Cast Stainless Steel

ACI-ASTM CA6N steel is a martensitic stainless steel formulated for casting. Cited properties are appropriate for the heat treated (HT) condition. CA6N is the designation in both the ACI and ASTM systems for this material. J91650 is the UNS number.

It has a fairly high tensile strength among the cast martensitic stainless steels in the database.

The graph bars on the material properties cards below compare ACI-ASTM CA6N steel to: cast martensitic 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

190 GPa 28 x 106 psi

Elongation at Break

17 %

Fatigue Strength

640 MPa 93 x 103 psi

Poisson's Ratio

0.28

Reduction in Area

57 %

Shear Modulus

75 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

1080 MPa 160 x 103 psi

Tensile Strength: Yield (Proof)

1060 MPa 150 x 103 psi

Thermal Properties

Latent Heat of Fusion

280 J/g

Maximum Temperature: Corrosion

390 °C 730 °F

Maximum Temperature: Mechanical

740 °C 1370 °F

Melting Completion (Liquidus)

1440 °C 2620 °F

Melting Onset (Solidus)

1400 °C 2550 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

23 W/m-K 13 BTU/h-ft-°F

Thermal Expansion

9.9 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.6 % IACS

Electrical Conductivity: Equal Weight (Specific)

3.0 % IACS

Otherwise Unclassified Properties

Base Metal Price

11 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

2.5 kg CO2/kg material

Embodied Energy

35 MJ/kg 15 x 103 BTU/lb

Embodied Water

110 L/kg 13 gal/lb

Common Calculations

PREN (Pitting Resistance)

12

Resilience: Ultimate (Unit Rupture Work)

180 MJ/m3

Resilience: Unit (Modulus of Resilience)

2900 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

38 points

Strength to Weight: Bending

30 points

Thermal Diffusivity

6.1 mm2/s

Thermal Shock Resistance

40 points

Alloy Composition

Among cast stainless steels, the composition of ACI-ASTM CA6N steel is notable for containing a comparatively high amount of nickel (Ni). 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) 77.9 to 83.5
Chromium (Cr) 10.5 to 12.5
Nickel (Ni) 6.0 to 8.0
Silicon (Si) 0 to 1.0
Manganese (Mn) 0 to 0.5
Carbon (C) 0 to 0.060
Phosphorus (P) 0 to 0.020
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 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