Alloy Physical Properties

Physical Properties Class 1 & 2 Physical Properties Class 3 & 4 Chemical Composition Copper Alloys Overview RWMA General Use and Description of RWMA Group A Copper Alloys

Minimum Physical Properties for Copper Alloys Class 3 & 4

GROUP A COPPER BASE ALLOYS *		HARDNESS ROCKWELL (HRB/HRC) **		CONDUCTIVITY % I.A.C.S. ***		ULTIMATE TENSILE STRENGTH ksi		YIELD STRENGTH ksi 0.2% OFFSET		ELONGATION % IN 2” OR 4 DIAMETERS
SIZE RANGE		CLASS		CLASS		CLASS		CLASS		CLASS
IN	MM	CLASS 3 C18000 C17510	CLASS 4 C17200	CLASS 3 C18000 C17510	CLASS 4 C17200	CLASS 3 C18000 C17510	CLASS 4 C17200	CLASS 3 C18000 C17510	CLASS 4 C17200	CLASS 3 C18000 C17510	CLASS 4 C17200
DIAMETER—ROUND ROD STOCK (WROUGHT)
UP TO 1”	UP TO 25	90 HRB	33 HRC	45%	20%	95	165	75	130	9%	2.0%
OVER 1” TO 2"	OVER 25 TO 51	90 HRB	33 HRC	45%	20%	92	165	75	130	9%	2.0%
OVER 2” TO 3"	OVER 51 TO 76	90 HRB	33 HRC	45%	20%	88	165	75	130	9%	2.0%
OVER 3” TO 3-1/2"	OVER 76 TO 89	90 HRB	33 HRC	45%	20%	88	165	75	130	9%	2.0%
OVER 3-1/2” TO 4"	OVER 89 TO 102	90 HRB	33 HRC	45%	20%	88	165	75	130	9%	2.0%
OVER 4” TO 4-1/2"	OVER 120 TO 114	90 HRB	33 HRC	45%	20%	88	165	75	130	9%	2.0%
THICKNESS - SQUARE, RECTANGULAR AND HEXAGONAL BAR STOCK (WROUGHT)
UP TO 1"	UP TO 25	90 HRB	33 HRC	45%	20%	95	165	75	130	9%	2.0%
OVER 1"	OVER 25	90 HRB	33 HRC	45%	20%	90	165	75	130	9%	2.0%
ANNEALED MATERIAL ****
ROUNDS		20 HRB	45 HRB	20% - 45%	15%-28%	--	--	--	--	--	--
THICKNESS—FORGINGS
UP TO 1”	UP TO 25	90 HRB	--	45%	--	94	--	50	--	9%	--
OVER 1” TO 2"	OVER 25 TO 51	90 HRB	--	45%	--	90	--	50	--	9%	--
OVER 2”	OVER 51	90 HRB	--	45%	--	88	--	50	--	9%	--
CASTINGS
ALL	ALL	90 HRB	33 HRC	45%	20%	75	150	45	120	5%	1.0%

RWMA Table 1.8.4
Data extracted from RWMA Bulletin 16 Table 1.8.4
Note: Acceptance based on Hardness and Conductivity, Tensile Strength, Yield Strength data is available for reference
* All materials are in the fully heat treated condition unless otherwise specified.
** Rod and bar to be tested at mid radius in accordance with ASTM test method E18.
*** Conductivity = 1/.0058 (Resistivity) where: Conductivity is expressed in the units % IACS and resistivity is expressed in the units mWcm.
**** Must meet the properties for RWMA heat treated material after age hardening.


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