Alloy 6B (UNS R30016)

Alloy 6B (UNS R30016) is a cobalt-based alloy with great wear, erosion and abrasion resistance. The wear resistance of alloy 6B is due to the chemical composition and is not a product of heat treatment or other hardening mechanisms. The low coeﬃcient of friction of alloy 6B allows it to resist seizing and galling; proving useful in areas and applications where lubrication is diﬃcult or impractical. Even under constant erosive conditions, alloy 6B has shown exceptional cavitation erosion resistance. Elevated temperature exposure has little eﬀect on this alloy’s hardness, impact strength, and dimensional stability. Alloy 6B also maintains high hardness at elevated temperatures (approaching 2000°F) and will recover its original hardness upon cooling to room temperature. This unique property, coupled with good corrosion resistance to a multitude of media and superior mechanical properties in relation to its outstanding wear resistant characteristics, makes alloy 6B a versatile alloy that can be used in numerous applications where wear, corrosion and elevated temperature are concerns.

Equivalent Grades

Trademark	GB	GOST	ASTM	UNS	DIN	W.Nr.	NF	BS	JIS	SS
Stellite 6B Alloy 6B CoCrW	–	–	R30016	–	–	–	–	–	–	–

Chemical Composition, %

Alloy	C	Si	Mn	P	S	Cr	Ni	Co	Mo	W	Fe
Alloy 6B	0.90-1.40	0.20-2.00	0.50-2.00	≤0.04	≤0.03	28.0-32.0	≤3.00	Bal	≤1.50	3.50-5.50	≤3.0

Typical Physical and Mechanical Properties (RT, Solution annealed)

Density, g/cm3	Melting Point, ℃	Tensile Strength, MPa	Yield Strength, MPa	ELongation, %	Hardness, HB
8.38	1265-1355	1300	700	8	37-43

Available Products and Specifications

Rod, Bar, Wire and Forgings	AMS 5894
Plate, Sheet and Strip	–
Pipe and Tube	–
Welding Product	–
Others	–

Features

Great wear, erosion and abrasion resistance
Good corrosion resistance to a multitude of media

Applications

Alloy 6B is suitable for use in a variety of high wear and erosion applications. The abrasion resistance of this alloy allows it to be used as industrial scraper blades and knives in the food processing, waste water treatment and textile industries. Alloy 6B is used in applications where erosion is an issue such as nozzles, pumps, valves and mixing blades that are moving slurries where cavitation damage is a concern. This alloy has also found use in industrial sliding wear applications such as valves in chemical processing and turbine blade components for steam control in the power industry. Alloy 6B can also be found in bearing assemblies in heat treat furnaces.