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Cobalt Alloy 6B - UNS R30006 Plate

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

Cobalt Alloy 6B - UNS R30006 Plate 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).


  • 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


  • UNS : R30006
  • Specifications : AMS 5894

Chemical Composition

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

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

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

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