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UNS C19700 Iron-Bearing Copper

C19700 copper is a lightly alloyed grade of copper, formulated for primary forming into wrought products. It can have a moderately low ductility among the wrought coppers in the database.

The properties of C19700 copper include five 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 C19700 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

2.4 to 13 %

Poisson's Ratio


Rockwell B Hardness

67 to 75

Rockwell Superficial 30T Hardness

65 to 72

Shear Modulus

43 GPa 6.3 x 106 psi

Shear Strength

240 to 300 MPa 35 to 44 x 103 psi

Tensile Strength: Ultimate (UTS)

400 to 530 MPa 58 to 77 x 103 psi

Tensile Strength: Yield (Proof)

330 to 520 MPa 47 to 75 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)

1040 °C 1900 °F

Specific Heat Capacity

390 J/kg-K 0.093 BTU/lb-°F

Thermal Conductivity

250 W/m-K 140 BTU/h-ft-°F

Thermal Expansion

17 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

86 to 88 % IACS

Electrical Conductivity: Equal Weight (Specific)

87 to 89 % IACS

Otherwise Unclassified Properties

Base Metal Price

30 % relative


8.9 g/cm3 560 lb/ft3

Embodied Carbon

2.6 kg CO2/kg material

Embodied Energy

41 MJ/kg 18 x 103 BTU/lb

Embodied Water

310 L/kg 37 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

12 to 49 MJ/m3

Resilience: Unit (Modulus of Resilience)

460 to 1160 kJ/m3

Stiffness to Weight: Axial

7.2 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

12 to 16 points

Strength to Weight: Bending

14 to 16 points

Thermal Diffusivity

73 mm2/s

Thermal Shock Resistance

14 to 19 points

Alloy Composition

Among wrought copper alloys, the composition of C19700 copper is notable for including magnesium (Mg) and cobalt (Co). Magnesium is used to improve strain hardenability. This increases strength but reduces the ability to form the alloy into complex shapes. Cobalt is used to improve strength.

Copper (Cu)Cu 97.4 to 99.59
Iron (Fe)Fe 0.3 to 1.2
Phosphorus (P)P 0.1 to 0.4
Magnesium (Mg)Mg 0.010 to 0.2
Tin (Sn)Sn 0 to 0.2
Zinc (Zn)Zn 0 to 0.2
Manganese (Mn)Mn 0 to 0.050
Nickel (Ni)Ni 0 to 0.050
Cobalt (Co)Co 0 to 0.050
Lead (Pb)Pb 0 to 0.050
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

Copper Alloys: Preparation, Properties and Applications, Michael Naboka and Jennifer Giordano (editors), 2013