COPPER CHROMIUM
Copper Chromium C18200, RWMA Class 2, AWS J1.3
Copper Chromium is the primary copper alloy used for resistance spot and seam welding. This alloy achieves good hardness and electrical conductivity through a combination of heat treatment and cold work. It is widely utilized for electrodes, holders, adaptors, as well as numerous electrical applications where resistance to deformation at high temperature is required or when higher mechanical properties than C11000 are required.
Chemical Compositions of RWMA Materials Group A - Copper Base Alloys |
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RWMA Class |
UNS Number |
Description |
Cu |
Cr |
2 |
C18200 |
Chromium Copper |
Balance |
0.6 - 1.2% |
Cu: Copper
Cr: Chromium
Typical usages of RWMA Class 2 copper alloy: C18200 is recommended 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 and more see below.
GENERAL USES OF C18200 |
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Back-up Electrodes |
Bushings |
Caps & Shanks |
Casting Wheels |
Centrifugal Casting Molds |
Circuit Breaker Parts |
Collector Connector |
Collector Housing |
Connector Bar |
Connectors |
Connection Lead Bar |
Cross Wire Welding Electrodes & Components |
Damper Ring/Finger |
Dies & Fixtures |
Electrode Holders and Adaptors |
Electrical & Mechanical Power Components |
End Rings & Rotor Bar |
Flash & Butt Welding Dies |
Flexible Connector |
Injection Blow Molds & Dies |
Lead Conductor Bar |
Neutral Bus Bar |
Nut & Stud Welding Electrodes |
Power Generation Products |
Power Semiconductor Bases |
Resistance Welding Electrodes |
Rotor Coil Bars |
Seam Weld Wheels |
Series Loop Segment |
Shafts |
Slip Rings |
Slot Wedge |
Snap Rings |
Special Nipple |
Spot Welding Electrodes |
Terminal Box Connectors |
Threaded Electrodes |
Transmission Devices |
Water Clip |
Welding Arms |
Welding Connectors |
Welding Platens |
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Item Name: | Copper Chromium Alloy C18200 |
RWMA (Resistance Welding Manufacturing Alliance) Class: | Class 2 |
Principal Element: | Cu, Cr |
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 Hexagon Octagon Plate Rectangle Round Special Square |
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 |
Click here for information on Rolled and Forged Plate
Quality Assurance
Quality Policy: Cadi Company Inc. is dedicated to world-class excellence. Our commitment is to continually achieve the highest standards required to meet our customer’s needs. Cadi is committed to a policy of continuous improvement within all areas of the organization through customer communication, by means of quality planning and review, as well as employee training and participation to achieve the Cadi commitment goal of 100% in quality, effectiveness, and customer satisfaction.
Quality Objectives: Cadi Company, Inc. is committed to the development and implementation of the ISO Quality Management System. We pledge that through the efforts of all our employees working together as a team, we will continually strive to be a leader (in our markets) in satisfying our customers’ needs with regard to service, performance, and competitive pricing. Cadi shall maintain global and domestic sources to provide quality products as required by our customers. Cadi will provide our customers with the highest level of satisfaction by achieving the goal of 100% in the areas of product quality and on-time delivery performance.
Cadi Company is committed to providing goods and services that meet or exceed our customer’s requirements and expectations. It is our firm belief that this dedication to the highest standards is the cornerstone of our existence.
- We have the equipment and processes to guarantee the quality of the products we manufacture.
- We continually upgrade our equipment and have ongoing training company-wide.
- Each order undergoes stringent Quality Assurance Processes to assure accuracy and precision to the client’s specifications and is verified throughout the manufacturing cycle with scheduled quality assurance audits.
- All material is subject to detailed physical tests where microstructures, tensile, yield strength, U.T. testing, eddy current conductivity, elongation, and hardness are measured and reported.
- Climate-controlled inspection facility.
- We have a Metallurgical Engineer on-site for any technical questions.
To ensure Cadi follows rigorous quality and procedural protocols we are ISO 9001:2015 Certified and have been for over 18 years.
ISO Certification: | 9001:2015 (Registration # 10002745 QM15 Valid until 2027-08-21) |
Reports: | Certification of Compliance Chemical Analysis Final Inspection Material Test Reports |
Mechanical and Physical Testing: | Elongation Grain Size Hardness Tensile Yield |
Nondestructive Testing: | Chemical Analysis Conductivity Liquid Penetrant Ultrasonic X-Ray |
Alloy Applications Cross Reference Chart | C15000 | C18150 | C18000 | C18200 | C17510 | C17200 | C15760 |
Axial Conductors | X | - | - | - | - | - | - |
Back-up Electrodes | X | X | X | X | X | X | X |
Bushings | X | X | X | X | X | - | - |
Caps & Shank | X | X | X | X | X | X | X |
Casting Wheels | X | X | - | X | - | - | - |
Casting Wheels and Dam Blocks | - | - | X | - | X | X | - |
Centrifugal Casting Mold | X | X | X | X | - | - | - |
Circuit Breaker Parts | X | X | - | X | - | - | X |
Collector Connector | X | X | - | X | - | - | - |
Collector Housing | X | X | - | X | - | - | - |
Connector Bar | X | X | - | X | - | - | - |
Connectors | X | X | X | X | X | - | X |
Connection Lead Bar | X | X | - | X | - | - | - |
Continuous Casting Molds | X | X | X | X | X | X | - |
Cross Wire Welding Electrodes & Components | X | X | X | X | X | X | X |
Damper Ring/Finger | X | X | X | X | - | - | - |
Dies & Fixtures | X | X | X | X | X | X | - |
Die Casting Pistons | - | - | X | - | X | X | - |
Die Casting Plunger Tips | - | - | X | - | X | X | - |
Electrode Holders & Adaptors | X | X | X | X | X | X | - |
Electrical & Mechanical Power Components | X | X | X | X | X | X | X |
Flash & Butt Welding Dies | X | X | X | X | X | X | X |
Flexible Connector | X | X | - | X | - | - | - |
Heat Flux Components | X | X | X | X | X | - | X |
Injection Blow Molds & Dies | - | X | X | X | X | X | - |
Joining Components | X | - | X | - | X | X | X |
Lead Conductor Bar | X | X | - | X | - | - | - |
Motor End Rings | X | X | X | X | X | - | - |
Neutral Bus Bar | X | X | - | X | - | - | - |
Non-Sparking Applications | - | X | X | X | X | X | - |
Nut & Stud Welding Electrodes | X | X | X | X | X | X | - |
Performance Engine Components | - | - | X | - | X | X | - |
Permanent Molds | - | - | X | - | X | X | X |
Power Generation Products | X | X | X | X | - | - | - |
Power Semiconductor Bases | X | X | - | X | - | - | - |
Resistance Welding Electrodes | X | X | X | X | X | X | - |
Rotor Coil Bar | X | X | - | X | - | - | - |
Seam Weld Wheels | X | X | X | X | X | X | - |
Series Loop Segment | X | X | - | X | - | - | - |
Shafts | X | X | X | X | X | X | - |
Slip Rings | X | X | - | X | - | - | - |
Slot Wedge | X | X | X | X | - | - | - |
Snap Rings | X | X | - | X | - | - | - |
Special Nipple | X | X | - | X | - | - | - |
Sputtering Target Backing Plate | X | X | X | ||||
Terminal Box Connectors | X | X | - | X | - | - | - |
Threaded Electrodes | X | X | X | X | X | X | - |
Transmission Devices | X | X | - | X | - | - | X |
Water Clip | X | X | - | X | - | - | - |
Wear Plates | - | - | - | - | - | X | - |
Welding Arms | X | X | X | X | X | X | - |
Welding Blocks | X | - | X | - | X | X | - |
Welding Connectors | X | X | X | X | X | X | - |
Welding Platens | X | X | X | X | X | X | - |
What is C182 Copper? Also known as chromium copper it offers excellent conductivity, weldability, and workability. This material excels with cold working, and it can be hot worked but it should be annealed again afterward and rapidly quenched.
What is Chromium Copper? Chromium copper alloys are high copper alloys that contain 0.6 to 1.2% chromium, and the balance is high quality copper. The chromium copper alloys are used for their high strength, corrosion resistance and electrical conductivity. Great for spot and seam welding.
Other References for C18200: RWMA Class 2, Class 2 Copper Alloy, UNS C18200, CDA C18200, Chromium Copper Rod, C18200 Copper Supplier, CuCr Alloy, C182 Copper and Mallory 3.