# Grade 705C Cast Zirconium

Grade 705C zirconium is a zirconium alloy. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. It has a moderately low ductility and a moderately high tensile strength among zirconium alloys.

The graph bars on the material properties cards below compare grade 705C zirconium to: zirconium 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

Brinell Hardness

200

Elastic (Young's, Tensile) Modulus

98 *GPa* 14 *x 10 ^{6} psi*

Elongation at Break

13 *%*

Poisson's Ratio

0.34

Rockwell B Hardness

87

Shear Modulus

36 *GPa* 5.3 *x 10 ^{6} psi*

Tensile Strength: Ultimate (UTS)

540 *MPa* 78 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

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

## Thermal Properties

Latent Heat of Fusion

250 *J/g*

Specific Heat Capacity

270 *J/kg-K* 0.064 *BTU/lb-°F*

Thermal Conductivity

18 *W/m-K* 10 *BTU/h-ft-°F*

Thermal Expansion

5.7 *µm/m-K*

## Otherwise Unclassified Properties

Density

6.7 *g/cm ^{3}* 420

*lb/ft*

^{3}Embodied Water

450 *L/kg* 54 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

66 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

790 *kJ/m ^{3}*

Stiffness to Weight: Axial

8.1 *points*

Stiffness to Weight: Bending

23 *points*

Strength to Weight: Axial

22 *points*

Strength to Weight: Bending

22 *points*

Thermal Diffusivity

9.9 *mm ^{2}/s*

Thermal Shock Resistance

69 *points*

## Alloy Composition

Zr | 91.9 to 98 | |

Nb | 2.0 to 3.0 | |

Hf | 0 to 4.5 | |

Fe | 0 to 0.3 | |

O | 0 to 0.3 | |

C | 0 to 0.1 | |

N | 0 to 0.030 | |

P | 0 to 0.010 | |

H | 0 to 0.0050 |

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

## Followup Questions

## Similar Alloys

## Further Reading

ASTM B752: Standard Specification for Castings, Zirconium-Base, Corrosion Resistant, for General Application