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Stellite 6b/Cobalt Alloy 6b/UNS R30016
Cobalt alloy 6b / Stellite 6b is a cobalt-based, chromium-tungsten alloy used extensively in wear environments where its low friction coefficient minimises the risk of seizing and galling, even in applications where lubrication is not practical. Stellite 6b is supplied in the solution treated condition (to AMS 5894) and its wear resistant properties inherent in this state limit the amount of heat treating and post machining. Typical applications for Alloy 6b include chain saw guide blades, furnace fan blades, high temperature bearings, valve stems, food processing equipment and steel mill equipment.
Cobalt Alloy Stellite 6b Applications
▪ Chain saw guide bars
▪ Furnace fan blades
▪ Steam turbine erosion shields
▪ High temperature bearings
▪ Food processing equipment
▪ Centrifuge liners
▪ Valve stems
▪ Needle valves
▪ Nozzles
▪ Hot extrusion dies
▪ Extruder screws
▪ Forming dies
▪ Pump plungers
▪ Valve parts
Cobalt Alloy Stellite 6b Specifications
| Grade |
AMS |
UNS |
| stellite 6b |
AMS 5894 |
R30016 |
Cobalt Alloy Stellite 6b Chemical Composition
| Cobalt, Co |
65 |
| Chromium, Cr |
28-32 |
| Tungsten, W |
3.50-5.50 |
| Iron, Fe |
3 |
| Nickel, Ni |
3 |
| Manganese, Mn |
2 |
| Molybdenum, Mo |
1.50 |
| Carbon, C |
0.90-1.40 |
Cobalt Alloy Stellite 6b Mechanical Properties
| Properties |
Metric |
Imperial |
| Tensile strength |
1000 MPa |
145000 psi |
| Yield strength |
621 MPa |
90100 psi |
| Elongation at break |
12% |
12% |
| Hardness, Brinell (estimated from Rockwell C) |
346 |
346 |
| Hardness, Knoop (estimated from Rockwell C) |
413 |
413 |
| Hardness, Rockwell A (estimated from Rockwell C) |
69.5 |
69.5 |
| Hardness, Rockwell C |
36-40 |
36-40 |
| Hardness, Vickers (estimated from Rockwell C) |
362 |
362 |
Cobalt Alloy Stellite 6b Chemical Composition
| Material |
Form |
Tensile Strength ksi |
Yield Strength ksi |
Elongation in 4D |
Reduction of Area |
Hardness (HRC) |
| Alloy 6b |
Bar (AMS 5894) |
130 |
70 |
5 |
7 |
33-43 |
| Alloy 6b |
Sheet / Plate (AMS 5894) |
130 |
70 |
5 |
7 |
33- |
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