Chemical Compositions

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	-	-	-	-	-	-	-	-	-	0.10-0.20	-
2	C18150	Chromium-Zirconium Copper	BAL.	-	-	-	-	-	0.5-1.5	-	-	-	0.02-0.20	-
2	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		-	0.20 max	1.8-2.0	0.02 max	-	0.20 max

							Ni + Co + Fe = 0.6 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