Copper Alloys Overview

RWMA Class	Alloy Grade	Composition	Minimum Hardness Rockwell	Minimum Electrical Conductivity
Class	UNS Number	Principal Elements	Up to 1” Dia	%IACS Min.
Class 1	C15000	Cu, Zr	HRB 65	80
Class 2	C18200	Cu, Cr	HRB 75	75
Class 2	C18150	Cu, Cr ,Zr	HRB 75	75
Class 3	C17510	Cu, Ni, Be	HRB 90	45
Class 3	C18000	Cu, Ni, Si, Cr	HRB 90	45
Class 4	C17200	Cu, Be	HRC 33	20
Class 10	10.74450	Cu, W	HRB 72	45
Class 11	11.74400	Cu, W	HRB 94	40
Class 12	12.74350	Cu, W	HRB 98	35
Class 13	13.74300	W	HRA 69	30
Class 14	14.42300	Mo	HRB 85	30
Class 20	C15760	Cu, Al oxide	HRB 75	75