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.
| Fe | 72.9 to 82 | |
| Cr | 18 to 21 | |
| Ni | 0 to 2.0 | |
| Si | 0 to 1.5 | |
| Cu | 0 to 1.2 | |
| Mn | 0 to 1.0 | |
| C | 0 to 0.3 | |
| P | 0 to 0.040 | |
| 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