# 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 10 ^{6} psi*

Elongation at Break

5.6 *%*

Poisson's Ratio

0.26

Shear Modulus

84 *GPa* 12 *x 10 ^{6} psi*

Tensile Strength: Ultimate (UTS)

620 *MPa* 89 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

390 *MPa* 57 *x 10 ^{3} 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*

Density

8.0 *g/cm ^{3}* 500

*lb/ft*

^{3}Embodied Carbon

9.2 *kg CO _{2}/kg material*

Embodied Energy

130 *MJ/kg* 58 *x 10 ^{3} BTU/lb*

Embodied Water

350 *L/kg* 42 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

30 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

370 *kJ/m ^{3}*

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

Cr | 47 to 52 | |

Ni | 43.3 to 51.6 | |

Nb | 1.4 to 1.7 | |

Fe | 0 to 1.0 | |

Si | 0 to 0.5 | |

Ti | 0 to 0.5 | |

Mn | 0 to 0.3 | |

Al | 0 to 0.25 | |

N | 0 to 0.16 | |

C | 0 to 0.1 | |

P | 0 to 0.020 | |

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