Stellite™ 31 Alloy

Nominal Composition (Mass %) and Physical Properties

Co Cr W C Ni Others Hardness Density (deposit) Melting Range
Base 26 7.5 0.5 10.5 Mo, Fe, Si 25-35 HRC* 8.61 g/cm3
0.311 lb/in3

*Hardness dependent on amount of work hardening.

Stellite 31

Stellite cobalt-based alloys consist of complex carbides in an alloy matrix. They are resistant to wear, galling, and corrosion and retain these properties at high temperatures. Their exceptional wear resistance is due mainly to the unique inherent characteristics of the hard carbide phase dispersed in a CoCr alloy matrix. 

Stellite 31 is a cobalt-base, high-temperature superalloy having high tensile and creep properties. It is superior in stress-rupture properties to many alloys commercially available, especially at 1700°F (926°C) and 1800°F (980°C). Stellite 31 is resistant to oxidizing and reducing atmospheres up to 2100°F (1150°C). It has excellent resistance to thermal and mechanical shock. Due to its high-temperature properties, Stelllite 31 is often used in gas turbine engines in areas subject to hot gas erosion, as well as furnace working tools that require a combination of mechanical integrity and hot wear resistance. 

Stellite 31 Cast Microstructure
UNS R30031 Castings, P/M Components, Powder
AMS 5382 Castings
ASTM A732 Gr.31 Castings


Stellite 31 Alloy Data Sheet

Check out our Stellite 31 Alloy data sheet for additional information.

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