ACI-ASTM CA28MWV (J91422) Cast Stainless Steel
ACI-ASTM CA28MWV steel is a martensitic stainless steel formulated for casting. Cited properties are appropriate for the heat treated (HT) condition. CA28MWV is the designation in both the ACI and ASTM systems for this material. J91422 is the UNS number.
It has the highest electrical conductivity among cast martensitic stainless steels. In addition, it has the highest embodied energy and a fairly low ductility.
The graph bars on the material properties cards below compare ACI-ASTM CA28MWV 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
Brinell Hardness
330
Elastic (Young's, Tensile) Modulus
200 GPa 28 x 106 psi
Elongation at Break
11 %
Fatigue Strength
470 MPa 69 x 103 psi
Poisson's Ratio
0.28
Reduction in Area
27 %
Shear Modulus
76 GPa 11 x 106 psi
Tensile Strength: Ultimate (UTS)
1080 MPa 160 x 103 psi
Tensile Strength: Yield (Proof)
870 MPa 130 x 103 psi
Thermal Properties
Latent Heat of Fusion
270 J/g
Maximum Temperature: Corrosion
380 °C 720 °F
Maximum Temperature: Mechanical
740 °C 1360 °F
Melting Completion (Liquidus)
1470 °C 2680 °F
Melting Onset (Solidus)
1430 °C 2600 °F
Specific Heat Capacity
470 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
25 W/m-K 14 BTU/h-ft-°F
Thermal Expansion
10 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
4.6 % IACS
Electrical Conductivity: Equal Weight (Specific)
5.3 % IACS
Otherwise Unclassified Properties
Base Metal Price
11 % relative
Density
7.9 g/cm3 490 lb/ft3
Embodied Carbon
3.1 kg CO2/kg material
Embodied Energy
44 MJ/kg 19 x 103 BTU/lb
Embodied Water
100 L/kg 12 gal/lb
Common Calculations
PREN (Pitting Resistance)
17
Resilience: Ultimate (Unit Rupture Work)
110 MJ/m3
Resilience: Unit (Modulus of Resilience)
1920 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
6.6 mm2/s
Thermal Shock Resistance
40 points
Alloy Composition
Among cast stainless steels, the composition of ACI-ASTM CA28MWV steel is notable for including vanadium (V) and tungsten (W). Vanadium has a strong hardening effect, but this effect is particularly sensitive to the type of tempering. Tungsten interacts with other alloying elements to a greater extent than usual, which makes it hard to broadly characterize its effects.
| Fe | 81.4 to 85.8 | |
| Cr | 11 to 12.5 | |
| Mo | 0.9 to 1.3 | |
| W | 0.9 to 1.3 | |
| Mn | 0.5 to 1.0 | |
| Ni | 0.5 to 1.0 | |
| Si | 0 to 1.0 | |
| V | 0.2 to 0.3 | |
| C | 0.2 to 0.28 | |
| P | 0 to 0.030 | |
| S | 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
Properties and Selection: Irons, Steels and High Performance Alloys, ASM Handbook vol. 1, ASM International, 1993
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