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UNS C19500 Iron-Cobalt-Tin Copper

C19500 copper is a lightly alloyed grade of copper, formulated for primary forming into wrought products. It has the highest melting temperature and a moderately low thermal conductivity among wrought coppers.

The properties of C19500 copper include seven 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 C19500 copper to: wrought coppers (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

120 GPa 17 x 106 psi

Elongation at Break

2.3 to 38 %

Poisson's Ratio


Rockwell B Hardness

71 to 86

Rockwell Superficial 30T Hardness

66 to 76

Shear Modulus

44 GPa 6.3 x 106 psi

Shear Strength

260 to 360 MPa 37 to 53 x 103 psi

Tensile Strength: Ultimate (UTS)

380 to 640 MPa 55 to 93 x 103 psi

Tensile Strength: Yield (Proof)

120 to 600 MPa 17 to 87 x 103 psi

Thermal Properties

Latent Heat of Fusion

210 J/g

Maximum Temperature: Mechanical

200 °C 390 °F

Melting Completion (Liquidus)

1090 °C 2000 °F

Melting Onset (Solidus)

1090 °C 1990 °F

Specific Heat Capacity

390 J/kg-K 0.092 BTU/lb-°F

Thermal Conductivity

200 W/m-K 120 BTU/h-ft-°F

Thermal Expansion

17 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

50 to 56 % IACS

Electrical Conductivity: Equal Weight (Specific)

50 to 57 % IACS

Otherwise Unclassified Properties

Base Metal Price

31 % relative


8.9 g/cm3 560 lb/ft3

Embodied Carbon

2.7 kg CO2/kg material

Embodied Energy

42 MJ/kg 18 x 103 BTU/lb

Embodied Water

310 L/kg 37 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

14 to 110 MJ/m3

Resilience: Unit (Modulus of Resilience)

59 to 1530 kJ/m3

Stiffness to Weight: Axial

7.3 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

12 to 20 points

Strength to Weight: Bending

13 to 18 points

Thermal Diffusivity

58 mm2/s

Thermal Shock Resistance

13 to 23 points

Alloy Composition

Among wrought copper alloys, the composition of C19500 copper is notable for including cobalt (Co) and aluminum (Al). Cobalt is used to improve strength. Aluminum is used to add strength and oxidation resistance.

Copper (Cu)Cu 94.9 to 98.6
Iron (Fe)Fe 1.0 to 2.0
Cobalt (Co)Co 0.3 to 1.3
Tin (Sn)Sn 0.1 to 1.0
Phosphorus (P)P 0.010 to 0.35
Zinc (Zn)Zn 0 to 0.2
Aluminum (Al)Al 0 to 0.020
Lead (Pb)Pb 0 to 0.020
Residualsres. 0 to 0.2

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

Followup Questions

Similar Alloys

Further Reading

ASTM B465: Standard Specification for Copper-Iron Alloy Plate, Sheet, Strip, and Rolled Bar