Stellite 6B

Cobalt Alloy AMS 5894

Material Data Sheet

Stellite 6B is an extensively hot worked alloy within a group of cobalt-chromium ‘super-alloys’ consisting of complex carbides in an alloy matrix predominantly designed for high wear resistance and superior chemical and corrosion performance in hostile environments. The combination of Cobalt and Chromium also results in an extremely high melting point making it perfect for a range of intriguing applications from extreme cutting tools to hot section alloy coatings in gas turbines.

Stellite alloys are non-magnetic and typically associated with high corrosion resistance and as with many alloys, they are adaptable and can be refined for a range of specific applications. Due to their incredibly hard material properties, Stellite 6B is inherently difficult and often expensive to machine, therefore some very precise casting and grinding methods are often employed.

Chemical Composition
Element Content %
Cobalt, Co 67.0
Chromium, Cr 32.0
Tungsten, W 5.5
Carbon, C 1.4
Iron, Fe 0.03
Nickel, Ni 0.03
Mangangese, Mn 0.02
Silicon, Si 0.02
Molybdenum, Mo 0.015
Physical Properties
Properties Metric Imperial
Density 8.387 g/cc 0.3030 lb/in³
Melting Point 1265 – 1354 °C 2309 – 2469 °F
Mechanical Properties
Properties Metric Imperial
Hardness, Brinell   102 102
Hardness, Knoop  414 414
Hardness, Rockwell A  71 71
Hardness, Rockwell C 41 41
Hardness, Vickers 396 396
Tensile Strength, Ultimate 976 MPa 142000 psi
Tensile Strength, Yield 638 MPa 92500 psi
Elongation at Break 6% 6%
Modulus of Elasticity 214 GPa 31000 ksi
Charpy Impact 8.00 J 5.90 ft-lb
Applications
  • Hardfacing Applications
  • Saw Teeth
  • Acid-Resistant Machine Parts
  • Poppet Valves
  • Valve Seats
  • Cutting Tools
  • Car Engines
  • Machine Gun And Rifle Barrels
  • Prosthetic Devices