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Copper Chromium Zirconium C18150, RWMA Class 2, AWS J1.3


Copper Chromium Zirconium has the addition of Zirconium to chromium copper to improve creep resistance at high operating temperatures and reduces sticking of electrodes to the work during spot welding of galvanized/coated materials. C18150 is specified mainly for electrode applications. Chromium Zirconium is an RWMA Class 2 material and is stronger than the RWMA Class 1 materials.


Typical usages of RWMA Class 2 Copper Alloy: C18150 is recommended for spot and seam, welding cold and hot rolled steels, coated materials, current-carrying shafts and arms, back-up bars for both resistance and arc welding, and electrical current carrying structural parts.





Back-up Electrodes


Caps & Shanks

Casting Wheels

Centrifugal Casting Molds

Circuit Breaker Parts

Collector Connector

Collector Housing

Connector Bar


Connection Lead Bar

Continuous Casting Molds

Cross Wire Welding Electrodes & Components

Damper Ring/Finger

Dies & Fixtures

Electrode Holders and Adaptors

Electrical & Mechanical Power Components

Flash & Butt Welding Dies

Flexible Connector

Heat Flux Components

Injection Blow Molds & Dies

Lead Conductor Bar

Motor End Rings

Neutral Bus Bar

Non-Sparking Applications

Nut & Stud Welding Electrodes

Power Generation Products

Power Semiconductor Bases

Resistance Welding Electrodes

Rotor Coil Bars

Seam Weld Wheels

Series Loop Segment


Slip Rings

Slot Wedge

Snap Rings

Special Nipple

Terminal Box Connectors

Threaded Electrodes

Transmission Devices

Water Clip

Welding Arms

Welding Connectors

Welding Platens


Item Name: Copper Chromium Zirconium Alloy C18150
RWMA (Resistance Welding Manufacturing Alliance) Class: Class 2
Principal Element: Cu, Cr, Zr
Minimum Hardness Rockwell (up to 1" dia.): HRB 75
Minimum Electrical Conductivity (% IACS): 75
Metal Stock Availability: Stocked in mill form or precision cut to your specifications.
Shape: Bar
Length for Round, Hexagon, Square, Octagon, Rectangle, Special Shapes: All sizes in standard lengths up to 12 ft
Special Sizes
Diameter for Round, Hexagon, Square, Octagon, Rectangle, Special Shapes: 1/8 to 15 1/8 in
Special Sizes
Thickness for Plate: 1/8 to 10 in
Special Sizes
ISO Certification: 9001:2015 (Registration # 10002745 QM15 Valid until 2021-08-21)
Reports: Certification of Compliance
Chemical Analysis
Final Inspection
Material Test Reports
Mechanical and Physical Testing: Elongation
Grain Size
Nondestructive Testing: Chemical Analysis
Liquid Penetrant

NOTE: C18150 Copper Chromium Zirconium and C15000 Copper Zirconium are both good replacements for C16200 Copper Cadmium. C18150 Copper Chromium Zirconium is a good replacement because of its precipitation hardened copper alloy that provides high strength at elevated temperatures with good conductivity. C15000 strength properties are developed through cold working  (similar to C16200) whereas C18150 strength properties are developed primarily from heat treating (precipitation hardening), which is an advantage for large parts.