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UNS C66700 Manganese Brass

C66700 brass is a brass formulated for primary forming into wrought products. It has a moderately high melting temperature and a moderately low thermal conductivity among wrought brasses.

The properties of C66700 brass include nine common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare C66700 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 106 psi

Elongation at Break

2.0 to 58 %

Poisson's Ratio

0.31

Rockwell B Hardness

57 to 93

Rockwell Superficial 30T Hardness

30 to 90

Shear Modulus

41 GPa 6.0 x 106 psi

Shear Strength

250 to 530 MPa 36 to 77 x 103 psi

Tensile Strength: Ultimate (UTS)

340 to 690 MPa 49 to 100 x 103 psi

Tensile Strength: Yield (Proof)

100 to 640 MPa 15 to 93 x 103 psi

Thermal Properties

Latent Heat of Fusion

180 J/g

Maximum Temperature: Mechanical

140 °C 290 °F

Melting Completion (Liquidus)

1090 °C 2000 °F

Melting Onset (Solidus)

1050 °C 1920 °F

Specific Heat Capacity

390 J/kg-K 0.092 BTU/lb-°F

Thermal Conductivity

97 W/m-K 56 BTU/h-ft-°F

Thermal Expansion

20 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

17 % IACS

Electrical Conductivity: Equal Weight (Specific)

19 % IACS

Otherwise Unclassified Properties

Base Metal Price

25 % relative

Density

8.2 g/cm3 510 lb/ft3

Embodied Carbon

2.7 kg CO2/kg material

Embodied Energy

45 MJ/kg 19 x 103 BTU/lb

Embodied Water

320 L/kg 38 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

13 to 150 MJ/m3

Resilience: Unit (Modulus of Resilience)

49 to 1900 kJ/m3

Stiffness to Weight: Axial

7.3 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

11 to 23 points

Strength to Weight: Bending

13 to 21 points

Thermal Diffusivity

30 mm2/s

Thermal Shock Resistance

11 to 23 points

Alloy Composition

Among wrought copper alloys, the composition of C66700 brass is notable for including manganese (Mn). Manganese is used to improve strength without a proportional reduction in ductility.

Copper (Cu) 68.5 to 71.5
Zinc (Zn) 26.3 to 30.7
Manganese (Mn) 0.8 to 1.5
Iron (Fe) 0 to 0.1
Lead (Pb) 0 to 0.070
Residuals 0 to 0.5

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

Followup Questions

Similar Alloys

Further Reading

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993