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ACI-ASTM CA40 (SCS2A, J91153) Cast Stainless Steel

ACI-ASTM CA40 is a martensitic stainless steel. It is typically furnished in the normalized and tempered condition. CA40 is the ACI-ASTM designation for this material. J91153 is the UNS number.

Mechanical Properties

Graph bars compare ACI-ASTM CA40 to other materials. From top to bottom: martensitic stainless steel, iron alloys, and the entire database.

Brinell Hardness

310

Elastic (Young's, Tensile) Modulus

200 GPa 29 x 106 psi

Elongation at Break

10 %

Modulus of Resilience (Unit Resilience)

1850 kJ/m3

Poisson's Ratio

0.28

Strength to Weight Ratio

120 kN-m/kg

Tensile Strength: Ultimate (UTS)

920 MPa 130 x 103 psi

Tensile Strength: Yield (Proof)

860 MPa 120 x 103 psi

Unit Rupture Work (Ultimate Resilience)

90 MJ/m3

Thermal Properties

Melting Onset (Solidus)

1500 °C 2730 °F

Specific Heat Capacity

450 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

25 W/m-K 14 BTU/h-ft-°F

Thermal Diffusivity

7.1 m2/s

Thermal Expansion

10 µm/m-K

Other Material Properties

Base Metal Price

12 % relative

Density

7.7 g/cm3 480 lb/ft3

Electrical Conductivity: Equal Volume

3.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

3.5 % IACS

Electrical Resistivity Order of Magnitude

-6.0 10x Ω-m

Embodied Carbon

2.0 kg CO2/kg material

Embodied Energy

28 MJ/kg 12 x 103 BTU/lb

Embodied Water

100 L/kg 12 gal/lb

PREN (Pitting Resistance)

14

Alloy Composition

Iron (Fe) 81.5 to 88.3
Chromium (Cr) 11.5 to 14
Silicon (Si) 0 to 1.5
Manganese (Mn) 0 to 1.0
Nickel (Ni) 0 to 1.0
Carbon (C) 0.2 to 0.4
Molybdenum (Mo) 0 to 0.5
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 A743: Standard Specification for Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application