MetalsWhat is C18150 copper and what is it used for? Beryllium-free chromium-zirconium copper
C18150 copper is chromium-zirconium copper, beryllium-free. In this guide we explain what C18150 copper is, its composition, its properties, what it is used for and the sizes we stock.
What is C18150 copper?
C18150 copper (copper-chromium-zirconium, CuCrZr) combines very high electrical and thermal conductivity with good mechanical strength and excellent resistance to softening. Hardenable by heat treatment, it is an RWMA Class 2 material, beryllium-free; the zirconium improves creep resistance and reduces electrode sticking in resistance welding.
Chemical composition of C18150 copper
This is the typical composition of C18150 copper (UNS C18150 / RWMA Class 2 / EN CW106C / DIN 2.1293 standard):
| Element | Contents | What for? |
|---|---|---|
| Chromium (Cr) | 0.50 – 1.50 % | Chromium: increases strength and hardness through precipitation |
| Zirconium (Zr) | 0.02 – 0.20 % | Zirconium: creep resistance and resistance to softening |
| Copper (Cu) | Balance | Base metal |
C18150 properties and treatment
C18150 (copper-chromium-zirconium) combines very high conductivity with good mechanical strength and excellent resistance to softening. It is hardenable by heat treatment and an RWMA Class 2, beryllium-free material. Zirconium improves creep resistance and reduces electrode sticking, which is why it is highly valued in resistance welding.
What is it for? Applications of C18150
C18150 copper is mainly used in:
- Resistance welding electrodes
- Welding wheels and tips
- Nozzles and tips
- Electrode holders and arms
- Back-up bars
- Continuous casting molds
- Contacts and switching
- Heavy-duty bus bars
- High-temperature components
Forms and sizes we carry
At NAT MAC we stock C18150 copper in these forms and sizes:
| Package size | Sizes |
|---|---|
| Round bars | 1/4" – 8" (6.35 – 203.2 mm) |
| Plates | 1/4" – 4" (6.35 – 101.6 mm) |
If you need a particular size, tell us which one and we will gladly source it for you.
C18150 equivalents and standards
C18150 copper is also identified by these standards: UNS C18150 / RWMA Class 2 / EN CW106C / DIN 2.1293. You can see how to read them in our article on metal standards.
In summary
- C18150 is chromium-zirconium copper, beryllium-free (RWMA Class 2)
- Very high conductivity + good strength; zirconium reduces electrode sticking
- Ideal for resistance welding and casting molds
- We carry it in round bars, plates, cut to size
Why buy your C18150 copper at NAT MAC?
We have more than 54 years of experience as an industrial supplier and ISO 9001 certified quality. We carry copper and its alloys, and we help you choose the right grade for your application.
- Quality C18150 copper, fully backed and traceable
- Material cut to the size you need
- Advice on choosing the right copper for your conductivity and strength needs
- Electrolytic copper and high-performance alloys
- On-time deliveries and competitive prices
Tell us what you'll make and what you need (conductivity, strength or weldability), and we'll recommend the right copper and form. Request your free quote.
Sources: data sheet from our NAT MAC catalog (composition, sizes and applications) and public references from the copper industry. Values are for reference and may vary by standard, temper and heat.
