C18200 Chromium

CDA/UNS C-18200

C18200 Chromium Copper is a general purpose resistance welding electrode material recommended for spot and seam welding of most materials. It is suitable for spot welding electrodes, projection welding electrodes, seam welding wheels, shafts and bearings, flash welding electrodes and current-carrying structural members. It is also available as high strength and high electrical conductivity castings for use as welding plattens and secondary circuit structural members. This material derives its properties from a combination of chemistry, heat treatment and cold work. Class 2 material should be used in the heat treated condtition.

MINIMUM PHYSICAL PROPERTIES FOR RWMA CLASS 2 COPPER

Group A Copper Base Alloys Hardness Rockwell Conductivity % I.A.C.S. Yield Strength KSI (typical) Ultimate  Tensile Strenth  (typical) Elongation % *(typical)
Size Range in MM Class 2 Class 2 Class 2 Class 2 Class 2
Diameter - Round Stock (cold worked)
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, Recatangle and Hexagonal Bar Stock (cold worked)
Up to 1" Up to 25 70 HRB 75% 45 65 13%
Over 1" Over 25 65 HRB 75% 40 55 13%
             
Thickness - Forgings 
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%

Castings
all all 55 HRB 70% 20 45 12%

TYPICAL USES

Consumer
Pencil-type and light soldering guns, tips and rod extensions

Electrical
Switch contacts, electric motor and generator components, contacts, wire, high temperature semi condutor basses, parts for electronic devices, cable connectors, thermal condutors requiring greater strength than plain copper, arcing and bridging parts, circuit breaker parts, electron tube grid side rods.

Industrial
Resistance welding machine electrodes, spot welding tips, seam welding wheels, electrode holders, flash welding electrodes, plastic mold components, current carrying shafts and arms, wear plates on heavy equipment, heat sinks, structural parts.

ADDITIONAL INFORMATION

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CHEMICAL COMPOSITION

(%max., unless shown as range or min.)

 

Min.Max

Cu Cr Fe Pb Si
Rem. .6-1.2 .10 .05 .10

Nominal 

Cu Cr Fe Pb Si
99.1 .9  -  -  -
 

OTHER DESIGNATIONS

CMW 3, Mallory 3, C-2, CL-2, Electroloy XX, H-2, #130, Tuffaloy 77,  Tuff 77, Weldaloy 20, Cr-Cu

 

C18200 Chromium MSDS