Stellite 6

Catalog : Stellite 6

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Description

Stellite 6

 

Co

Cr W C Others Hardness Density Melting Range
 

Base

 

27 – 32

 

4 – 6

 

0.9-1.4

Ni, Fe, Si,

Mn, Mo

36-45 HRC

380-490 HV

8.44 g/cm3

0.305 lb/in3

2340-2570 °F

1285-1410 °C

 

 

Stellite® cobalt base alloys consist of complex carbides in an alloy matrix. They are resistant to wear, galling and corrosion and retain these properties at high temperatures. Their exceptional wear resistance is due mainly to the unique inherent characteristics of the hard carbide phase dispersed in a CoCr alloy matrix.

Stellite® 6 is the most widely used of the wear resistant cobalt based alloys and exhibits good all round performance. It is regarded as the industry standard for general-purpose wear resistance applications, has excellent

resistance to many forms of mechanical and chemical degradation over a wide temperature range, and retains a reasonable level of hardness up to 500°C

Scanning Electron Micrograph of Cast Stellite 6 at 1000x magnification.

 

(930°F). It also has good resistance to impact and cavitation erosion. Stellite® 6 is ideally suited to a variety of hardfacing processes and can be turned with carbide tooling. Examples include valve seats and gates; pump shafts and bearings, erosion shields and rolling couples. It is often used self-mated.

 

Corrosion Resistance

The typical electrode potential in sea water at room temperature is -0.25V (SCE). Like stainless steels, Stellite® 6 corrodes primarily by a pitting mechanism and not by general mass loss in seawater and chloride solutions. Its mass loss in sea water is below 0.05mm per year at 22˚C. More information regarding corrosion resistance can be provided on request.

 

Nominal Thermal Expansion Coefficient (from 20°C/68°F to stated temperature)

100°C (212°F) 200°C (392°F) 300°C (572°F) 400°C (752°F) 500°C (932°F) 600°C (1112°F) 700°C (1292°F) 800°C (1472°F) 900°C (1652°F) 1000°C (1832°F)

µm/m.K

11.35 12.95 13.6 13.9 14.2 14.5 14.7 15.05 15.5

17.5

µ-inch/inch.°F 6.31 7.20 7.56 7.72 7.89 8.06 8.17 8.36 8.61

9.72

 

Nominal Tensile Properties at Room Temperature

Ultimate Tensile Strength Rm Yield Stress Rp(0.2%) Elongation Elastic Modulus

ksi MPa ksi MPa A(%) psi GPa
Castings 123 850 101.5 700 <1 30.3×106

209

Stellite® HS-6 (*) 183.5 1265 109 750 3 – 5 34×106

237

(*) “HS” = HIP-consolidated. Ref: Ashworth et al. Powder Metal. 1999 42[3] p.243-249 and internal tests.

 

Nominal Hot Hardness (DPH) as-cast

20°C (68°F)

100°C (212°F) 200°C (392°F) 300°C (572°F) 400°C (752°F) 500°C (932°F) 600°C (1112°F) 700°C (1292°F) 800°C (1472°F) 900°C (1652°F)
410 390 356 345 334 301 235 155 138

95

 

Thermal and Electrical Properties

Approximate value at Room Temperature

Thermal conductivity

14.82 W/m.K

102.7 Btu-in/hr/ft2/°F

Electrical resistivity 106 µ-ohm.cm

41.7 µ-ohm.inch

 

Product Forms and Cross Reference Specifications

Stellite® 6 is available as welding wire, rod, powder, and electrodes; finished castings and P/M parts. Deloro Stellite also offers hardfacing services. A separate brochure is available for the wrought forms of this alloy, namely Stellite® 6B and Stellite® 6K. Stellite® 6 can be supplied to the following specifications:

Stellite is a registered Trade Name of Deloro Stellite.

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