C18150 Class 2 Chromium-Zirconium Copper
Class 2
C18150 Chromium-Zirconium Copper is a high-strength, high-conductivity copper alloy utilized in spot welding and various demanding electrical applications. Classified as RWMA Class 2, it combines conductivity, wear resistance, and heat tolerance, making it suitable for cap-style electrodes, electrode holders, back-up tooling, and high-current electrical components.
NSRW supplies C18150 in bars, rods, rounds, electrodes, and custom shapes, whether you need stock material or fully machined tooling for structural parts, wear plates, or light soldering guns.
Our team can help you get exactly what your application requires. Contact NSRW for C18150 copper supply, custom electrodes, or tooling solutions.
Benefits of Using C18150 Copper
- Extended electrode service life: High wear resistance helps maintain electrode geometry, reducing the frequency of replacements in continuous production environments.
- Improved performance with galvanized steels: Minimizes electrode sticking, decreasing downtime for cleaning or dressing and maintaining weld consistency.
- Efficient heat dissipation: High thermal conductivity transfers heat away from the weld zone, reducing the risk of workpiece distortion.
- Lower operating temperatures for tooling: Reduced heat buildup preserves electrode integrity and prolongs service life.
- Stable at elevated temperatures: Retains strength and electrical conductivity during extended high-temperature operations.
Chemical Composition & Properties
Chemical Composition
| Copper (Cu)
(incl. Ag) |
Chromium (Cr) | Zirconium (Zr) |
| Rem. | .5 – 1.5 | .05 – .25 |
RWMA Class 2 Copper Minimum Physical Properties
Diameter – Round Stock (Cold Worked)
| Size Range in MM | Size Range in MM | Hardness Rockwell | Conductivity % I.A.C.S. | Yield Strength KSI (typical) | Ultimate Tensile Strength (typical) | Elongation % *(typical) |
| Up to 1″ | Up to 22 | 75 HRB | 75% | 55 | 65 | 13% |
| Over 1″ to 2″ | Over 25 to 51 | 70 HRB | 75% | 55 | 59 | 13% |
| Over 2″ to 3″ | Over 51 to 76 | 65 HRB | 75% | 55 | 55 | 13% |
Thickness – Square, Rectangle, and Hexagonal Bar Stock (Cold Worked)
| Size Range in MM | Size Range in MM | Hardness Rockwell | Conductivity % I.A.C.S. | Yield Strength KSI (typical) | Ultimate Tensile Strength (typical) | Elongation % *(typical) |
| Up to 1″ | Up to 25 | 70 HRB | 75% | 45 | 65 | 13% |
| Over 1″ | Over 25 | 65 HRB | 75% | 40 | 55 | 13% |
Thickness – Forgings
| Size Range in MM | Size Range in MM | Hardness Rockwell | Conductivity % I.A.C.S. | Yield Strength KSI (typical) | Ultimate Tensile Strength (typical) | Elongation % *(typical) |
| Up to 1″ | Up to 25 | 65 HRB | 75% | 45 | 55 | 13% |
| Over 1″ to 2″ | Over 25 to 51 | 65 HRB | 75% | 45 | 55 | 13% |
| Over 2″ | Over 51 | 65 HRB | 75% | 40 | 55 | 13% |
Supply Options from NSRW
NSRW supplies C18150 in:
- Bars, rounds, and plates
- Custom-machined electrodes and tooling
- Electrode tips and industrial welding components
With years of experience under our belt, you can trust our experts to assist you with material selection, fabrication, and design optimization in order to ensure the best performance for your application.
Request a quote or speak with our welding specialists today about your next project.
Related Copper Alloys
Looking for other RWMA copper alloys? Explore our other options below:
- C15000 Copper-Zirconium (Class 1)
- C18200 Chromium Copper (Class 2)
- C18000 Copper-Nickel-Silicon-Chromium
Need C18150 Copper for Resistance Welding?
NSRW is a trusted RWMA Class 2 copper alloy supplier for resistance welding and electrical and industrial applications. Contact our team today for material availability, technical advice, or a custom quote.
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