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UNS C92200 (CB498K) Navy-M Leaded Bronze

C92200 bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. CB498K is the EN numeric designation for this material. C92200 is the UNS number. Additionally, the EN chemical designation is CuSn6Zn4Pb2. Older literature may refer to this material as ASTM Alloy 2A, but this is now discouraged.

It has a very high ductility among cast bronzes. In addition, it has a fairly high electrical conductivity and a moderately low melting temperature.

The graph bars on the material properties cards below compare C92200 bronze to: cast bronzes (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

Compressive (Crushing) Strength

180 MPa 26 x 103 psi

Elastic (Young's, Tensile) Modulus

110 GPa 16 x 106 psi

Elongation at Break

25 %

Fatigue Strength

76 MPa 11 x 103 psi

Poisson's Ratio

0.34

Rockwell B Hardness

65

Shear Modulus

41 GPa 5.9 x 106 psi

Tensile Strength: Ultimate (UTS)

280 MPa 40 x 103 psi

Tensile Strength: Yield (Proof)

140 MPa 20 x 103 psi

Thermal Properties

Latent Heat of Fusion

190 J/g

Maximum Temperature: Mechanical

170 °C 340 °F

Melting Completion (Liquidus)

990 °C 1810 °F

Melting Onset (Solidus)

830 °C 1520 °F

Solidification (Pattern Maker's) Shrinkage

1.6 %

Specific Heat Capacity

370 J/kg-K 0.089 BTU/lb-°F

Thermal Conductivity

70 W/m-K 40 BTU/h-ft-°F

Thermal Expansion

19 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

14 % IACS

Electrical Conductivity: Equal Weight (Specific)

14 % IACS

Otherwise Unclassified Properties

Base Metal Price

32 % relative

Density

8.7 g/cm3 540 lb/ft3

Embodied Carbon

3.2 kg CO2/kg material

Embodied Energy

52 MJ/kg 22 x 103 BTU/lb

Embodied Water

360 L/kg 43 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

58 MJ/m3

Resilience: Unit (Modulus of Resilience)

87 kJ/m3

Stiffness to Weight: Axial

6.9 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

8.9 points

Strength to Weight: Bending

11 points

Thermal Diffusivity

21 mm2/s

Thermal Shock Resistance

9.9 points

Alloy Composition

Among cast copper alloys, the composition of C92200 bronze is notable for containing a comparatively high amount of lead (Pb) and including sulfur (S). Lead is used to improve machinability and bearing properties, at the cost of toxicity. It also adds pressure tightness to castings. Sulfur is used to improve machinability at the cost of a decrease in electrical conductivity.

Copper (Cu) 86 to 90
Tin (Sn) 5.5 to 6.5
Zinc (Zn) 3.0 to 5.0
Lead (Pb) 1.0 to 2.0
Phosphorus (P) 0 to 1.5
Nickel (Ni) 0 to 1.0
Iron (Fe) 0 to 0.25
Antimony (Sb) 0 to 0.25
Sulfur (S) 0 to 0.050
Silicon (Si) 0 to 0.0050
Aluminum (Al) 0 to 0.0050
Residuals 0 to 0.7

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

Followup Questions

Similar Alloys

Further Reading

ASTM B271: Standard Specification for Copper-Base Alloy Centrifugal Castings

ASTM B505: Standard Specification for Copper Alloy Continuous Castings

Copper: Its Trade, Manufacture, Use, and Environmental Status, Gunter Joseph, 2001

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