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ACI-ASTM CB30 (J91803) Cast Stainless Steel

ACI-ASTM CB30 steel is a ferritic stainless steel formulated for casting. Cited properties are appropriate for the heat treated (HT) condition. CB30 is the designation in both the ACI and ASTM systems for this material. J91803 is the UNS number.

The graph bars on the material properties cards below compare ACI-ASTM CB30 steel to: cast ferritic 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

210

Elastic (Young's, Tensile) Modulus

200 GPa 29 x 106 psi

Poisson's Ratio

0.28

Shear Modulus

77 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

500 MPa 73 x 103 psi

Tensile Strength: Yield (Proof)

230 MPa 34 x 103 psi

Thermal Properties

Latent Heat of Fusion

290 J/g

Maximum Temperature: Corrosion

420 °C 790 °F

Maximum Temperature: Mechanical

940 °C 1720 °F

Melting Completion (Liquidus)

1430 °C 2600 °F

Melting Onset (Solidus)

1380 °C 2520 °F

Specific Heat Capacity

480 J/kg-K 0.12 BTU/lb-°F

Thermal Conductivity

21 W/m-K 12 BTU/h-ft-°F

Thermal Expansion

11 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.5 % IACS

Electrical Conductivity: Equal Weight (Specific)

3.0 % IACS

Otherwise Unclassified Properties

Base Metal Price

10 % relative

Density

7.7 g/cm3 480 lb/ft3

Embodied Carbon

2.3 kg CO2/kg material

Embodied Energy

33 MJ/kg 14 x 103 BTU/lb

Embodied Water

130 L/kg 16 gal/lb

Common Calculations

PREN (Pitting Resistance)

20

Resilience: Unit (Modulus of Resilience)

140 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

5.6 mm2/s

Thermal Shock Resistance

17 points

Alloy Composition

Among cast stainless steels, the composition of ACI-ASTM CB30 steel is notable for including copper (Cu). Copper is primarily used to improve resistance to acids.

Iron (Fe) 72.9 to 82
Chromium (Cr) 18 to 21
Nickel (Ni) 0 to 2.0
Silicon (Si) 0 to 1.5
Copper (Cu) 0 to 1.2
Manganese (Mn) 0 to 1.0
Carbon (C) 0 to 0.3
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

Metallic Materials: Physical, Mechanical, and Corrosion Properties, Philip A. Schweitzer, 2003

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