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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.

Iron (Fe) 81.4 to 85.8
Chromium (Cr) 11 to 12.5
Molybdenum (Mo) 0.9 to 1.3
Tungsten (W) 0.9 to 1.3
Manganese (Mn) 0.5 to 1.0
Nickel (Ni) 0.5 to 1.0
Silicon (Si) 0 to 1.0
Vanadium (V) 0.2 to 0.3
Carbon (C) 0.2 to 0.28
Phosphorus (P) 0 to 0.030
Sulfur (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