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Stellite® alloy 250

 

Subcategory: Superalloy; Cobalt Base

Close Analogs: Stellite 251, Stellite 238, UMCO-50/51, Haynes 150, Esco 72

Key Words: Deloro Stellite Inc.

Material Notes:
Cobalt content as balance. Resistant to heat, thermal shock, thermal cycling, oxidation, and hot corrosion from flue gas, slags, and molten copper. Not recommended for use in abrasive wear.

Applications:heat treatment furnaces, metallurgical industrial furnaces such as copper smelters, baskets, grates, tray, slab skids, reheat furnaces, gas and pulverized coal burners, discharge rolls and channels, radiant tube supports, and parts in contact with molten slags and molten copper.

Corrosion: Good resistance to oxidation by air or air SO2 mixtures, and corrosive resistance by H2S up to 1249°C (2280°F). Not corroded by molten copper, but it is attacked by molten zinc and aluminum. In aqueous media, withstands attack by dilute sulfuric acid and by boiling concentrated nitric acid, but is attacked by reducing acids such as HCl.

Machinability: Has tendency to work harden, can be machined with grade C² or C³ tungsten carbide tools. A stress relief treatment of 935°C (1650°F) for 4 hours and slow cooling will aid machining.

Data provided by the manufacturer, Deloro Stellite, Inc.

Available Properties
  • Density
  • Hardness, Knoop
  • Hardness, Rockwell A
  • Hardness, Rockwell B
  • Hardness, Rockwell C
  • Hardness, Vickers
  • Tensile Strength, Ultimate
  • Tensile Strength, Yield
  • Elongation at Break
  • Modulus of Elasticity
  • Charpy Impact
  • CTE, linear 1000°C
  • Thermal Conductivity
  • Melting Point
  • Solidus
  • Liquidus
   
Property Data

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