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ACI-ASTM CF3 (SCS19, SCS19A, J92500) Cast Stainless Steel

ACI-ASTM CF3 steel is an austenitic stainless steel formulated for casting. Cited properties are appropriate for the heat treated (HT) condition. CF3 is the designation in both the ACI and ASTM systems for this material. J92500 is the UNS number.

It has the highest ductility among cast austenitic stainless steels. In addition, it has a fairly low base cost and a moderately high thermal conductivity.

The graph bars on the material properties cards below compare ACI-ASTM CF3 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

140

Elastic (Young's, Tensile) Modulus

200 GPa 29 x 106 psi

Elongation at Break

60 %

Fatigue Strength

270 MPa 39 x 103 psi

Poisson's Ratio

0.28

Shear Modulus

77 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

510 MPa 73 x 103 psi

Tensile Strength: Yield (Proof)

250 MPa 36 x 103 psi

Thermal Properties

Latent Heat of Fusion

300 J/g

Maximum Temperature: Corrosion

420 °C 790 °F

Maximum Temperature: Mechanical

960 °C 1770 °F

Melting Completion (Liquidus)

1420 °C 2590 °F

Melting Onset (Solidus)

1450 °C 2640 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

16 W/m-K 9.3 BTU/h-ft-°F

Thermal Expansion

16 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.3 % IACS

Otherwise Unclassified Properties

Base Metal Price

16 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

3.2 kg CO2/kg material

Embodied Energy

45 MJ/kg 19 x 103 BTU/lb

Embodied Water

150 L/kg 18 gal/lb

Common Calculations

PREN (Pitting Resistance)

20

Resilience: Ultimate (Unit Rupture Work)

250 MJ/m3

Resilience: Unit (Modulus of Resilience)

160 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

18 points

Strength to Weight: Bending

18 points

Thermal Diffusivity

4.3 mm2/s

Thermal Shock Resistance

11 points

Alloy Composition

Among cast stainless steels, the composition of ACI-ASTM CF3 steel is notable for containing comparatively high amounts of nickel (Ni) and chromium (Cr). Nickel is primarily used to achieve a specific microstructure. In addition, it has a beneficial effect on mechanical properties and certain types of corrosion. Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance.

Iron (Fe) 62.9 to 75
Chromium (Cr) 17 to 21
Nickel (Ni) 8.0 to 12
Silicon (Si) 0 to 2.0
Manganese (Mn) 0 to 1.5
Molybdenum (Mo) 0 to 0.5
Phosphorus (P) 0 to 0.040
Sulfur (S) 0 to 0.040
Carbon (C) 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

Properties and Selection: Irons, Steels and High Performance Alloys, ASM Handbook vol. 1, ASM International, 1993

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

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