Alloy C263 is an aluminum-titanium age hardening nickel base superalloy welding wire. Gas tungsten arc welding is normally carried out using argon shielding gas. Argon +5% hydrogen has been used. Alloy C263 base metal is normally welded in the annealed condition 2100° F, rapid cool). After welding, the assembly may be aged 8 hours at 1470° F, air cool. Repair welding of alloy C263 components may be done in the age hardened condition.
Chemistry

	Cr	Ni	Mo	Co	Al	Ti	Al+Ti	B	C	Fe	Mn	Si	P	S	Ag	Bi	Pb	Cu
MIN	19	-	5.6	19.0	0.3	1.9	2.4	-	0.01	-	-	-	-	-	-	-	-	-
MAX	21.00	Balance	6.10	21.00	0.60	2.40	2.80	0.005	0.08	0.70	0.60	0.40	0.015	0.007	0.0005	0.0001	0.002	0.20

Specifications
AMS 5872, AMS 5872E, AMS 5886, AMS 5966
EN 2.4650
GE B50A771, GE B50A783
RR 9500/16
UNS N07263
Werkstoff 2.4650
Inventory
C263 Plate, C263 Round Bar, C263 Sheet, C263 Weld Wire
Common Trade Names
Cobalt 263, Nimonic® Alloy C263
Features
• High strength as age-hardened
Applications
• Welding 263 base metal
• Welding GTD222 investment castings
Physical Properties
Density: 0.302 lb/in3
Melting Range: 2372-2471° F

Temperature, ° F	400	800	1000	1200	1400	1600	1800
Coefficient* of Thermal Expansion, in/in° F x 10-6	6.7	7.4	7.7	8.1	8.7	9.6	10.2

* 70° F to indicated temperature.
Nimonic®