Stellite™ 12 Alloy

Nominal Composition (Mass %) and Physical Properties

Co Cr W C Others Hardness Density Melting Range
Base 27-32 7.5-9.5 1.4-2.0 Ni, Fe, Si, Mn 45-51 HRC
435-590 HV
8.53 g/cm3
0.308 lb/in3

Stellite 12

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 12 could be considered an intermediate alloy between Stellite 6 and Stellite 1. It contains a higher fraction of hard, brittle carbides than Stellite 6, and has increased resistance to low-angle erosion, abrasion, and severe sliding wear whilst retaining reasonable impact and cavitation resistance. Stellite 12 is often used self-mated or running against Stellite 6 or Stellite 1. The higher tungsten content provides better high-temperature properties compared to Stellite 6, and it can be used at temperatures up to about 700 ̊C.

Stellite 12 is typically used for cutting tools that need to withstand abrasion, heat, and corrosion. Examples include industrial knives for cutting carpets, plastics, paper and synthetic fibres; and saw tips in the timber industry. It is also used for control plates in the beverage industry, pump vanes, bearing bushes and narrowneck glass mold plungers; and for hardfacing of engine valves, pinch rollers in the metal-processing industries and rotor blade edges. 


Optical Micrograph of a Stellite 12 PTA Deposit at 500X

Stellite 12 can be supplied to the following specifications:

UNS R30012 Rod, Castings
UNS W73012 Electrode
UNS W73042  Wire
AWS A5.21 / ASME BPVC IIC SF A 5.21 ERCoCr-B  Rod
AWS A5.21 / ASME BPVC IIC SF A 5.21 ERCCoCr-B  Wire
AWS A5.13 / ASME BPVC IIC SF A 5.13 ECoCr-B  Electrode


Stellite 12 Alloy Data Sheet

Check out our Stellite 12 Alloy data sheet for additional information.

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