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50Cr-50Ni-Cb (R20501) Casting Alloy

50Cr-50Ni-Cb alloy is a chromium alloy. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. It has a very high heat capacity among alloys in the same category. In addition, it has a fairly high tensile strength and a fairly low density.

The graph bars on the material properties cards below compare 50Cr-50Ni-Cb alloy to: chromium alloys (top), all alloys in the same category (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

Elastic (Young's, Tensile) Modulus

210 GPa 31 x 106 psi

Elongation at Break

5.6 %

Poisson's Ratio


Shear Modulus

84 GPa 12 x 106 psi

Tensile Strength: Ultimate (UTS)

620 MPa 89 x 103 psi

Tensile Strength: Yield (Proof)

390 MPa 57 x 103 psi

Thermal Properties

Latent Heat of Fusion

350 J/g

Specific Heat Capacity

480 J/kg-K 0.12 BTU/lb-°F

Thermal Expansion

15 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

60 % relative


8.0 g/cm3 500 lb/ft3

Embodied Carbon

9.2 kg CO2/kg material

Embodied Energy

130 MJ/kg 58 x 103 BTU/lb

Embodied Water

350 L/kg 42 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

30 MJ/m3

Resilience: Unit (Modulus of Resilience)

370 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

21 points

Strength to Weight: Bending

20 points

Thermal Shock Resistance

14 points

Alloy Composition

Chromium (Cr)Cr 47 to 52
Nickel (Ni)Ni 43.3 to 51.6
Niobium (Nb)Nb 1.4 to 1.7
Iron (Fe)Fe 0 to 1.0
Silicon (Si)Si 0 to 0.5
Titanium (Ti)Ti 0 to 0.5
Manganese (Mn)Mn 0 to 0.3
Aluminum (Al)Al 0 to 0.25
Nitrogen (N)N 0 to 0.16
Carbon (C)C 0 to 0.1
Phosphorus (P)P 0 to 0.020
Sulfur (S)S 0 to 0.020

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM A560: Standard Specification for Castings, Chromium-Nickel Alloy

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015