A near-alpha alloy, primarily used for high strength and toughness, with good creep resistance up to 1000°F. Forging and machining characteristics similar to those of Ti 6Al-4V. Applications include compressor components, hot airframe skin, and engine afterburner structures. The weldability of Ti 6-2-4-2 is fair, using AMS 4952 weld wire. Several different treatments are available.

Sheet & Strip under 0.1875" thickness: Duplex anneal: 1650 ± 25°F), 30± 3 minutes, air cool, followed by 1450± 25°F 15± 2 minutes, air cool.

Triplex anneal: 1650°F ½ hour, air cool, followed by 1450°F ¼ hour, air cool, 1100°F 2 hours air cool.

Plate 0.1875 inch thickness and over: Duplex anneal: 650± 25°F 60± 5 minutes, air cool, followed by 1100±25°F 8 hours ± 15 minutes, air cool. Triplex anneal: 1650°F ½ hour, air cool, followed by 1450°F ¼, air cool, 1100°F 2 hours air cool.

Bar and Forgings: Duplex anneal: Solution anneal 25 - 50°F below. Beta transus 1 hour, air cool or faster, 1100°F 8 hours air cool.
Chemistry

	Al	Sn	Zr	Mo	C	N	H	O	Si	Fe	Y	Others, Each	Others, Total	Ti
MIN	5.5	1.8	3.6	1.8	--	--	--	--	0.06			--	--	--
MAX	6.5	2.2	4.4	2.2	0.05	0.05	0.015	0.12	0.1	0.25	0.005	0.1	0.3	Balance

Specifications
AMS 4919, AMS 4975, AMS 4976, AMS 4979, AMS T-9047
EN 3.71450
MIL-F-81556
MIL-F-82142, MIL-T-9046
MIL-T-9047
UNS R54620
Werkstoff 3.7145
Inventory
6Al-2Sn-4Zr-2Mo Forged Billet, 6Al-2Sn-4Zr-2Mo Plate, 6Al-2Sn-4Zr-2Mo Round Bar, 6Al-2Sn-4Zr-2Mo Sheet
Common Trade Names
6-2-4-2 Titanium, 6-2-4-2
Features
• Machinability similar to austenitic stainless steels
• Easily welded if proper precautions are taken to prevent oxygen, nitrogen and hydrogen contaminations
• Long term stability for temperatures up to 800°F
Applications
• Compressor discs, blades
• Airframe structure, skin
• Engine afterburner components
• Hush kits
Physical Properties
Density: 0.160 lb/in3
Beta Transus: 1825±25°F
Thermal Conductivity: 4.00 Btu • hr/ft2 • hr°F
Coefficient of Thermal Expansion: 32-212°F 4.3 x10-6 in/in°F
Modulus of Elasticity: 16.5x106 psi
Mechanical Properties
Minimum Tensile Properties, AMS 4919, Duplex Annealed

Thickness, in	0.025 ≤ 0.062	> 0.062 ≤ 1.000	> 1.000 ≤ 3.000
Tensile Strength, ksi	135,000	135,000	135,000
0.2% offset Yield Strength, ksi	125,000	125,000	125,000
Elongation, %	8	10	10

Bend Factors, Duplex Annealed, AMS 4919

Nominal Thickness, in	≤ 0.070	> 0.070 < 0.1875
Factor, 105° Bend	9	10