Cobalt Alloy 6b / Stellite 6b (AMS 5894)

Technical Data Sheet

Chemical Composition Limits
Weight % C Mn Si P S Cr Ni Co Mo W Fe
Cobalt Alloy 6b 0.90-1.40 0.50-2.00 0.20-2.00 0.04 max 0.03 max 28.00-32.00 3.00 max bal 1.50 max 3.50-5.50 3.0 max

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.

Typical Mechanical Properties (minimums)

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 33-43
Properties shown are for sheet and plate up to 1.0" thick and for round bar up to 3.5" diameter.
*Reduction in area is not applicable to sheet or plate under 0.5" thick

Cobalt Alloy 6b / Stellite 6b is available in round bar, wire, sheet and plate. For all stock availability contact Sales.

AMS 5894 - bar, sheet and plate
UNS R30016

At Aircraft Materials all stock items can be shipped out within 24 hours, usually within the same day. Even cutting orders for bar or sheet can be processed and dispatched the same day, and for time-critical situations such as AOGs, we have a dedicated AOG service desk ready to help (

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Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.

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