Alloy 694, also referred to as Coast Metal 64, is a cobalt-chromium-tungsten alloy providing high strength and stability at temperatures up to 2100°F. Deposits of alloy 694 have outstanding resistance to wear, erosion, creep, thermal fatigue and oxidation. The principal application is for hard-facing turbine blade interlock surfaces. Wire diameters 0.035", 0.045" and 0.062" are available in straight cut lengths or layer wound spools. This alloy is also available in shaped squares, flats and diamonds sized per customer requirements.
Chemistry
|
|
Cr
|
Ni
|
Mo
|
Co
|
W+Mo
|
Va
|
B
|
C
|
Fe
|
Mn
|
Su
|
|
MIN
|
26
|
4.0
|
-
|
-
|
18.0
|
0.75
|
0.005
|
0.7
|
-
|
-
|
-
|
|
MAX
|
30.0
|
6.0
|
0.5
|
Balance
|
21.0
|
1.25
|
0.1
|
1.0
|
3.0
|
1.0
|
1.0
|
Specifications
DMR 34.070
GE B50AB42B, GE B50TF55
MSRR.9500-226, MTS 1087A, PWA 694
Inventory
694 Weld Wire
Common Trade Names
CM-64, Coast Metal 64, Alloy 694
Features
• Hot erosive wear resistance
• Oxidation resistance to 2100°F
• Thermal shock, creep strength
Applications
• Hardfacing gas turbine blade shroud interlock surfaces and other wear location areas
Physical Properties
Density: 0.327 lb/in3
Melting Range: 7.7 in/in°F x 106
|
Temperature, °F
|
400
|
1000
|
1200
|
1400
|
1600
|
1800
|
|
Coefficient* of Thermal Expansion,
in/in°F x 10-6
|
7.0
|
7.8
|
8.1
|
8.4
|
8.9
|
9.7
|
|
Thermal Conductivity
Btu • ft/ft2 • hr • °F
|
7.3
|
10.4
|
11.6
|
12.7
|
13.9
|
-
|
|
Modulus of Elasticity Dynamic,
psi x 106
|
30
|
27
|
26
|
24
|
23
|
121
|
* 70°F to indicated temperature.
Mechanical Properties
Representative Tensile Properties
|
Temperature, °F
|
1800
|
|
Ultimate Tensile Strength, ksi
|
48
|
Typical Hardness
|
Temperature, °F
|
70
|
800
|
1000
|
1200
|
1400
|
|
Hot Hardness, DPH
|
440
|
355
|
20
|
210
|
220
|
