Beryllium Copper Alloy C17510

General Characteristics
C17500/C17510 offer a combination of high electrical and thermal conductivity with good strength compared to most copper based alloys. C17500 alloy is the mirror image of alloy C17510 in terms of its properties and characteristics. The alloys differ in that C17500 specifies a cobalt alloying addition (2.40-2.70 %) and alloy 17510 specifies a nickel alloying addition (1.40-2.20 %), but their performance are the same. Typical uses: fuse clips, fasteners, springs, switch and relay parts, electrical conductors and welding equipment.
Typical Chemical Composition

Weight % Be Ni Fe Cu Other

minimum 0.40 1.40 — 98.00 —

maximum 0.70 2.20 0.10 0.50

Weight %	Be	Ni	Fe	Cu	Other
minimum	0.40	1.40	—	98.00	—
maximum	0.70	2.20	0.10	0.50

Characteristics		English	Metric
Nominal density (68°F/20°C)		0.316 lbs/in³	8.75 g/cm³
Specific heat (212 °F/100°C)		0.10 BTU/lb – °F	420 J/KG- °K
Melting range		1900-1980 °F	1040-1080 °C
Coefficient of thermal expansion	68°F – 392°F 20°C – 200°C	9.8 micro in/in- °F	17.6 micro m/m- °K
Electrical resistivity	20°C / 68°F	29-86 nΩ ∙ m

Temper	Tensile					Hardness	Electrical Conductivity
	Ultimate		Yield		Elongation in 50 mm (2 in.)	Rockwell B	%IACS
	KSI	MPa	KSI	MPa	%		%IACS
TB00 – Solution Heat Treated	35-55	69-140	20-30	140-205	20-35	28-50	20-30
H04 – Hard	70-85	485-585	55-80	380-550	3-10	70-80	20-30
TF00 – Precipitation Hardened (AT)	100-120	690-825	80-100	550-690	10-20	92-100	45-60
TH04 – Hard and Precipitation Heat Treated (HT)	110-130	760-895	100-120	690-825	8-15	98-102	50-60
HTR – Proprietary mill hardening for maximum strength.	120-150	825-1035	110-140	760-965	1-4	98-103	45-60
HTC – Proprietary mill hardening for maximum strength.	75-85	515-585	50-75	345-515	8-15	79-88	60 min