# UNS C44400 Admiralty Brass

C44400 brass is a brass formulated for primary forming into wrought products. Cited properties are appropriate for the O61 (annealed) temper. C44400 is the UNS number for this material. Older literature may refer to this material as ASTM Admiralty Metal Type C, but this is now discouraged.

It has a moderately low tensile strength among the wrought brasses in the database.

The graph bars on the material properties cards below compare C44400 brass to: wrought brasses (top), all copper 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

Elastic (Young's, Tensile) Modulus

110 *GPa* 16 *x 10 ^{6} psi*

Poisson's Ratio

0.32

Shear Modulus

41 *GPa* 5.9 *x 10 ^{6} psi*

Tensile Strength: Ultimate (UTS)

350 *MPa* 51 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

120 *MPa* 17 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

180 *J/g*

Maximum Temperature: Mechanical

140 *°C* 290 *°F*

Melting Completion (Liquidus)

940 *°C* 1720 *°F*

Melting Onset (Solidus)

900 *°C* 1650 *°F*

Specific Heat Capacity

380 *J/kg-K* 0.092 *BTU/lb-°F*

Thermal Conductivity

110 *W/m-K* 64 *BTU/h-ft-°F*

Thermal Expansion

20 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

25 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

27 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

26 *% relative*

Density

8.3 *g/cm ^{3}* 520

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

46 *MJ/kg* 20 *x 10 ^{3} BTU/lb*

Embodied Water

330 *L/kg* 39 *gal/lb*

## Common Calculations

Resilience: Unit (Modulus of Resilience)

65 *kJ/m ^{3}*

Stiffness to Weight: Axial

7.2 *points*

Stiffness to Weight: Bending

19 *points*

Strength to Weight: Axial

12 *points*

Strength to Weight: Bending

13 *points*

Thermal Diffusivity

35 *mm ^{2}/s*

Thermal Shock Resistance

12 *points*

## Alloy Composition

Among wrought copper alloys, the composition of C44400 brass is notable for including antimony (Sb). Antimony is used to improve certain types of corrosion resistance.

Cu | 70 to 73 | |

Zn | 25.2 to 29.1 | |

Sn | 0.9 to 1.2 | |

Sb | 0.020 to 0.1 | |

Pb | 0 to 0.070 | |

Fe | 0 to 0.060 | |

res. | 0 to 0.4 |

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

## Followup Questions

## Similar Alloys

## Further Reading

ASTM B111: Standard Specification for Copper and Copper-Alloy Seamless Condenser Tubes and Ferrule Stock

ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001

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