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Cobalt Alloy 6B - UNS R30006 Sheet

Cobalt Alloy 6B - UNS R30006 Sheet, Cobalt Alloy 6B, UNS R30006 Sheet, Alloy 6B, Cobalt 6B, HPA Cobalt Alloy 6B.

What is Cobalt Alloy 6B?

Cobalt alloy 6b, also known as Stellite 6b, is a chromium-tungsten alloy based on cobalt that is widely used in wear conditions. Its low friction coefficient prevents the probability of galling and seizing even in situations where lubrication is impractical. The quantity of heat treatment and post-machining is limited by the wear-resistant qualities of Stellite 6b, which are supplied in the solution-treated condition (to AMS 5894).

Cobalt Alloy 6B - UNS R30006 Sheet is a cobalt-base alloy with excellent corrosion resistance to severe conditions and high temperatures. This nickel cobalt alloy provides outstanding resistance to most types of wear. Stellite 6b® provides inherent wear resistance, it is not the result of heat-treatment, plating, nitriding, or other methods used to produce a superficial hardness on metal parts.

Super alloys have good creep and oxidation resistance, and can function at very high temperatures and severe mechanical stress. Their strength can be increased by solid-solution hardening, precipitation hardening, and work hardening. They are available in different forms, and comprise a wide range of elements in a variety of combinations so as to achieve the desired result. There are three groups of super alloys, namely cobalt-based, nickel-based, and iron-based alloys. All these alloys can function at temperatures above 540°C (1000°F).

Cobalt Alloy 6B - UNS R30006 Sheet is extremely suitable in environments where a high combination of strength, high modulus values and good corrosion resistance are required.


A range of high wear and erosion applications are suited for Cobalt alloy 6B. This alloy's resistance to abrasion makes it suitable for use in industrial knives and scraper blades for the textile, waste water treatment, and food processing sectors. Applications where erosion is a problem, such as nozzles, pumps, valves, and mixing blades moving slurries where cavitation damage is a worry, are where alloy 6B is employed. This alloy has also been used in sliding wear applications in the industrial sector, including valves in the chemical processing industry and turbine blade parts for steam control in the power sector. In heat treat furnaces, bearing assemblies made of alloy 6B are also common.


  • Resists erosive wear
  • Good impact & thermal shock resistance
  • Resists heat & oxidation
  • Abrasion & corrosion resistant
  • Resists seizing & galling
  • Good strength
  • Meets UNS R30006 specifications


  • Doctor blades
  • Valve parts
  • Pump plungers
  • Knives
  • Bearings

Specifications of Cobalt Alloy 6b

  • UNS : R30006
  • Specifications : AMS 5894

Chemical Composition of Cobalt Aloy 6b

Chemical Analysis


.90- 1.40


2.0 max


2.0 max


28.0- 32.0


3.0 max


1.50 max




3.0 max


3.50- 5.50

Physical Properties of Cobalt Alloy 6b

Properties Metric Imperial
Density 8.39 g/cm³ 0.303 lb/in³

Mechanical Properties of Cobalt Alloy 6b

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

Calico Metal Alloys LLP export products to countries like UAE, Bahrain, Italy, Indonesia, Malaysia, United States, Mexico, Chine, Brazil, Peru, Nigeria, Kuwait, Jordan, Dubai, Thailand (Bangkok), Venezuela, Iran, Germany, UK, Canada, Russia, Turkey, Australia, New Zealand, Sri Lanka, Vietnam, South Africa, Kazakhstan & Saudi Arabia.

HASTELLOY, HAYNES and C-22 are registered trade names of Haynes International, Inc., MONEL & INCONEL are registered trade names of INCO family of companies., NITRONIC is a registered trade name of Armco Inc., CARPENTER & 20Cb-3 are registered trade names of Carpenter Technology Corporation., FERRALIUM is a registered trade name of Langley Alloys, LTD.

Nickel Alloys Materials