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
1 C15000 Zirconium Copper 99.80 min - - - - Wi - - - - 0.10-0.20 -
2 C18150 Chromium-Zirconium Copper BAL. - - - - - 0.5-1.5 - - - 0.02-0.20 -
C18200 Chromium Copper BAL. - - - - - 0.6-1.2 0.10 max - 0.05 max - -
3 C17500 Cobalt-Beryllium Copper BAL. 0.10 max - - 2.4-2.7 - - 0.20 max 0.4-0.7 - - 0.20 max
C17510 Nickel-Beryllium Copper BAL. 0.10 max - -   1.4-2.2 - 0.20 max 0.2-0.6 - - 0.20 max
C17540 Nickel-Cobalt-Beryllium copper BAL. 0.20 max - - 0.8-1.3 0.8-1.3 - 0.20 max 0.4-0.7 - - -
C18000 Nickel-Silicon-Chromium Copper BAL. 0.15 max - - - 1.8-3.0 0.1-0.8 0.4-0.8 - - - -
4 C17200 Beryllium Copper BAL. - - -

Ni + Co = 0.20 min 

Ni + Co + Fe = 0.6 max

 - 0.20 max 1.8-2.0 0.02 max - 0.20 max
Group B - Refractory Metal Composites and Refractory Metals
10 NA² Copper Tungsten 43-47 - BAL. - - - - - - - - -
11 ASTM  B702 C1D Copper Tungsten 23-27 - BAL. - - - - - - - - -
12 ASTM B702 C1E Copper Tungsten 18-22 - BAL. - - - - - - - - -
13 NA² Tungsten - - 99.9 min - - - - - - - - -
14 ASTM B387 Alloy 360 or 361 Molybdenum - - (Mo) 99.9 min - - - - - - - - -
Group C - Specialty Materials
20 C15760 Dispersion Strengthened Copper 98.77 0.01 max - - - - - - - 0.01 max - 0.58-0.62 as Al₂O₃
21 C15715 Dispersion Strengthened Copper 98.77 0.01 max - - - - - - - 0.01 max - 0.3 as Al₂O₃ 
22 C15725 Dispersion Strengthened Copper 98.77 0.01 max - - - - - - - 0.01 max - 0.5 as Al₂O₃

Notes:

1. Including Ag

2. Not assigned

References:

  • American Welding Society Publication J1.3
  • ASTM