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Copper Beryllium C17200, RWMA Class 4

Other Designations: ASTM B196, AWS J1.3, ASTM B196, AMS 4533, SAE J461, CuBe2.1247, Alloy 25,  Mold-Mor® 3, Mold-Mor® 4


Copper Beryllium is the highest strength copper alloy and is specified when the mechanical strength is the limiting design feature for a copper alloy. It is a heat treatable copper alloy having the unusual very combination of high hardness and strength and lower electrical conductivity than AWS J1.3/ RWMA Class 4 materials. Specify Cadi MOLD-MOR® 3 or 4 for mold applications.


Chemical Compositions of RWMA Materials   Group A - Copper Base Alloys
RWMA Class UNS Number Description Cu¹ Fe W Cd Co Ni Cr Si Be Pb Zr Al
4 C17200 Beryllium Copper Balance - - - Ni + Co = 0.20% min.  - 0.20% max. 1.8-2.0% 0.02% max. - 0.20% max.
Ni + Co + Fe = 0.6% max.



Typical usages of C172  RWMA Class 4 copper alloy: C17200 is recommended for flash and upset welding dies, projection welding and seam welding bushings, and other applications requiring harder copper alloys.


Fabrication Properties of C17200 Alloy:  

  • Machining - C17200 copper alloy has a machinability rate of 20%.
  • Welding - Butt welding, seam welding, spot welding, coated metal arc welding, gas-shielded arc welding, brazing and soldering are recommended for C17200 copper alloys. Oxyacetylene welding is not recommended for C17200.
  • Forging - For C17200 occurs at a temperature of 649 to 816 degrees Celsius.
  • Hot working - C17200 copper alloys have good hot working capabilities.
  • Cold working - C17200 copper alloys have excellent cold working properties.
  • Annealing - Is the process of heating metal or glass and allowing it to cool slowly. This process removes internal stresses and strengthens it. C17200 copper alloys are annealed at temperatures from 774 to 802 degrees Celsius

 Other fabrication properties include drawing, drilling, blanking, forming and bending, tapping, and turning. 




Back-up Electrodes


Caps & Shanks

Casting Wheels & Dam Blocks

Continuous Casting Molds

Cross Wire Welding Electrodes & Components

Dies & Fixtures

Electrode Holders and Adaptors

Electrical & Mechanical Power Components

Flash & Butt Welding Dies

Injection Blow Molds & Dies

Joining Components

Nut & Stud Welding Electrodes

Permanent Molds


Plunger Tips

Resistance Welding Electrodes

Seam Weld Wheels


Spot Welding Electrodes

Threaded Electrodes

Wear Plates

Welding Arms

Welding Blocks

Welding Connectors

Welding Platens




Item Name: Copper Beryllium Alloy C17200,  ASTM B196
RWMA (Resistance Welding Manufacturing Alliance) Class: Class 4
Principal Element: Cu, Be
Minimum Hardness Rockwell (up to 1" dia.): HRC 33
Minimum Electrical Conductivity (% IACS): 20
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 8 in
Special Sizes
Thickness for Plate: 1/2 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
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      
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