# Grade 704C Cast Zirconium

Grade 704C zirconium is a zirconium alloy. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. It has the lowest ductility among the zirconium alloys in the database.

The graph bars on the material properties cards below compare grade 704C 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

210

Elastic (Young's, Tensile) Modulus

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

Elongation at Break

11 *%*

Poisson's Ratio

0.34

Rockwell B Hardness

85

Shear Modulus

36 *GPa* 5.2 *x 10 ^{6} psi*

Tensile Strength: Ultimate (UTS)

470 *MPa* 68 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

310 *MPa* 45 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

240 *J/g*

Specific Heat Capacity

270 *J/kg-K* 0.064 *BTU/lb-°F*

Thermal Conductivity

21 *W/m-K* 12 *BTU/h-ft-°F*

Thermal Expansion

5.9 *µm/m-K*

## Otherwise Unclassified Properties

Density

6.7 *g/cm ^{3}* 420

*lb/ft*

^{3}Embodied Water

460 *L/kg* 55 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

48 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

490 *kJ/m ^{3}*

Stiffness to Weight: Axial

8.1 *points*

Stiffness to Weight: Bending

23 *points*

Strength to Weight: Axial

20 *points*

Strength to Weight: Bending

20 *points*

Thermal Diffusivity

12 *mm ^{2}/s*

Thermal Shock Resistance

58 *points*

## Alloy Composition

Zr | 92.9 to 99 | |

Hf | 0 to 4.5 | |

Sn | 1.0 to 2.0 | |

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