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C18200 Chromium copper
CuCr, C182. High strength and heat resistant coppers. The general purpose resistance welding electrode material. Also mould inserts and hot stiff parts.
Specification
- UNS
- C18200
- Conductivity
- 80 percent IACS
- Machinability
- 20 (C36000 = 100)
- Specification
- Specification depends on product form, confirm with the supplier. RWMA Class 2.
- Usual temper
- TH04 precipitation hardened and cold worked
Published typical values for the alloy, not a promise from any shop. Where these numbers come from.
How it machines
Machinability rated 20. In the solution treated condition it is gummy like pure copper. Aged, it is harder and abrasive on tooling. The usual routes are machine soft then age, accepting a small dimensional movement, or machine in the hardened temper and accept a slower cycle.
Watch out. Age hardened, so machining before or after heat treatment changes both the cycle time and the final dimensions. Say which dimensions are critical.
Typical parts
- General purpose resistance welding electrodes
- Electrode shanks and holders
- Mould inserts and cooling pins
- Hot stiff structural parts
When not to specify it
Not for conductivity alone, where C11000 is far better. Never order it without a temper, because the hardness that stops a tip mushrooming only exists after heat treatment.
Drawing callout
Replace the bracket with the ASTM specification for your product form. The RFQ builder does this for you and adds edge, finish and plating lines.
Chromium copper, UNS C18200, [ASTM spec for your product form], temper TH04 precipitation hardened and cold worked
Other high strength and heat resistant coppers
Age hardened alloys chosen for strength, hardness or hot performance. Conductivity drops, sometimes a long way, and none of them machine quickly.
- C15000
Zirconium copperResistance welding electrodes for aluminum and coated steel, and parts that must stay conductive while hot. - C18150
Chromium zirconium copperWelding electrodes and holders, high duty contacts, parts that see heat and load together. - C17510
Nickel beryllium copperWelding electrode holders, high conductivity springs, parts needing strength with moderate conductivity. - C17200
Beryllium copperSpring contacts, connectors, non-sparking tools, mould inserts, high fatigue components.