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HPA Cobalt Alloy 6B (Co-Cr-W) (UNS R30016) Co 59.0, Cr 30.0, W 3.5, Ni 2.5, Mn 1.4, C 1.0

Excellent hot strength, which is fully returned when cooled to room temperature again. Replacement for castings due to better ductility, and dependability for sealing surfaces. Seizing, galling and non-lubricated wear can be minimized by using this alloy. Metal seizing is when one metal piece building heat against another "weld" together. Galling is when these welded areas break off and forms abrasive debris which creates additional abrasion problems, and can lead to other types of corrosion.

Turbine engine nozzle fuel injectors, steam turbine (last vane) to prevent water erosion as the steam condenses. Pump applications such as motor shafts, bushings, sleeves and stems.
Unit of Measure

Specifications

Type

 N/A Sheet

Size

 N/A 0.093 in

Alloy

 N/A 6B

Physical

Density

 N/A 0.330 lb/in³

Specific Heat

 N/A 0.100 Btu/lb ºF

Electrical Resistivity

 N/A 574 ohm/cir-mil-ft

Melting Range

 N/A 2310 to 2470 ºF

Thermal Expansion Coefficient at 32 to 390 Degree Fahrenheit (ºF)

 N/A 7.8 x 10-6 in/in/ºF

Mechanical

Mechanical Type

 N/A Annealed

Tensile Strength

 N/A 145 ksi

Yield Strength

 N/A 90 ksi

Elongation

 N/A 7 to 12 %

Hardness

 N/A C33 - 43

Nominal Chemistry

Nickel (Ni)

 N/A 2.5

Iron (Fe)

 N/A Balanced

Chromium (Cr)

 N/A 30

Cobalt (Co)

 N/A 59

Tungsten (W)

 N/A 3.5

Manganese (Mn)

 N/A 1.4

Carbon (C)

 N/A 1

General Resistance

General Resistance

 N/A Temperature Oxidation Wear Galling

Unified Numbering System (UNS)

 N/A R30016

Sheet/Plate USA

 N/A AMS 5894

Bar/Rod USA

 N/A AMS 5894

Fitting USA

 N/A NA

Forging USA

 N/A AMS 5894

Applications

N/A Steam turbine erosion shields, Chain saw guide bars, High temperature bearings, Furnace fan blades, Valve stems, Food processing equipment, Needle valves, Centrifuge liners, Hot extrusion dies, Forming dies, Nozzles, Extruder screws & many other Misc. wear surfaces.

Applications for alloy 6B include half sleeves and half bushings in screw conveyors, tile making machines, rock crushing rollers and cement and steel mill equipment. Alloy 6B is well suited for valve parts, pump plungers.

Wrought alloy 6B offers the ductility, fatigue resistance and toughness of a hot worked microstructure, with the heat corrosion and wear resistance of cobalt based alloy. High Performance Alloys, Inc. inventories bar, sheet, and plate. Bar is stocked from 3/8" through 6" diameter. Bar can be supplied in random lengths or cut to order. Sheet and plate are offered as whole plates, can be abrasive cut, or processed further using water jet services.

Additional Information

Additional Information

 N/A Cobalt 6B is cobalt based chromium, tungsten alloy for wear environments where seizing, galling and abrasion are present. 6B is resistant to seizing and galling and with its low coefficient of friction, allows sliding contact with other metals without damage by metal pick up in many cases. Seizing and galling can be minimized in applications without lubrication or where lubrication is impractical. Metal seizing is similar to one metal piece building heat against another and they become "welded" together. Galling is when these "weld" areas break off and form abrasive debris which creates additional abrasion problems.

Alloy 6B has outstanding resistance to most types of wear. Its wear resistance is inherent and not the result of cold working, heat treating or any other method. This inherent property reduces the amount of heat treating and post machining. 6B has outstanding resistance to cavitation erosion. Steam turbine erosion shields from 6B have protected the blades of turbines for years of continuous service. 6B has good impact and thermal shock resistance resists heat and oxidation, retains high hardness even at red heat (then cooled, recovers full original hardness) and has resistance to a variety of corrosive media. 6B is useful where both wear and corrosion resistance is needed.