694 (CM-64)

694 (CM-64)

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

 CrNiMoCoW+MoVBCFeMnSu
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 B50A842BGE B50TF55
MSRR.9500-226
MTS 1087A
PWA 694

Inventory

694 Welding Products

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 21

* 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 440 355 320 310 220