What Is Cu-FRHC
Cu-FRHC, material number CW005A, is a fire-refined high-conductivity copper grade used for general electrical purposes. It is covered by the EN 13600 to EN 13605 series for seamless tubes, rod, bar, wire, plate, sheet, strip, and profiles for electrical applications, and EN 1976 for cast unwrought products. The classification is copper with minimum 99.9 percent copper content and a maximum oxygen content of 0.04 percent.
Chemical Composition
The composition limits are copper minimum 99.9 percent, oxygen maximum 0.04 percent, and other elements total maximum 0.04 percent. Copper including silver is below 0.015 percent for the silver allowance, and oxygen up to 0.06 percent is permitted in some supply conditions. The controlled oxygen content balances conductivity with processability.
Mechanical Properties
Mechanical properties are defined by material condition based on minimum tensile strength. In the R200 condition the tensile strength is 200 MPa with 0.2 percent proof strength of 120 MPa and elongation of 35 percent. In the R250 condition the tensile strength is 250 MPa with proof strength of 180 to 200 MPa and elongation of 12 to 15 percent. In the R350 condition the tensile strength is 350 MPa with proof strength of 320 MPa and elongation of 5 percent. Hardness ranges from 35 to 65 HV in the H035 condition, 65 to 90 HB in H065, and 100 HB in H100.
Electrical Properties
The volume resistivity of Cu-FRHC is 0.01724 to 0.01786 ohm square millimeters per meter, corresponding to a minimum electrical conductivity of about 96 percent IACS. This high conductivity makes the grade suitable for busbars, conductors, and other electrical components.
Casting and Conditions
The grade can be produced by sand casting, permanent mould casting, centrifugal casting, continuous casting, or pressure die casting. The R designation indicates conditions defined by minimum tensile strength with mandatory elongation requirements, and H indicates conditions defined by minimum hardness.
Applications
Cu-FRHC is used for electrical conductors, busbars, transformer windings, switchgear components, and general electrical engineering products where high conductivity and reliable mechanical properties are required.
Frequently Asked Questions
Q: What does FRHC stand for?
A: Fire-refined high conductivity.
Q: What is the copper content of CW005A?
A: Minimum 99.9 percent.
Q: What is the oxygen limit?
A: Maximum 0.04 percent.
Q: What is the volume resistivity?
A: 0.01724 to 0.01786 ohm square millimeters per meter.
Q: What conditions are available?
A: R200, R250, and R350 with H035, H065, and H100 hardness conditions.
Q: What standards cover Cu-FRHC?
A: The EN 13600 to 13605 series and EN 1976.
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