High Temperature Strength, Wear & Corrosion Performance
The cobalt-based Stellite alloys are our most well-known and successful alloys, with the best “all-around” properties. They combine excellent mechanical wear resistance, especially at high temperatures, with very good corrosion resistance.
The Stellite alloys are cobalt based with additions of Cr, C, W and/or Mo. They are generally resistant to cavitation, corrosion, erosion, abrasion and galling. The lower carbon Stellite alloys are generally recommended for cavitation, sliding wear or moderate galling. The higher carbon alloys are usually selected for abrasion, severe galling or low-angle erosion.
The Stellite alloys retain their properties at high temperatures where they also have excellent oxidation resistance. They can be finished to exceptional levels of surface finish with a low coefficient of friction to give good sliding wear.
Browse Our Stellite Alloys
Stellite 6
Our most popular alloy with good all-around performance. Industry standard for general-purpose wear-resistance applications. Excellent resistance for many forms of mechanical and chemical degradation. Good resistance to impact and cavitation erosion. Ideally suited for a variety of hardfacing processes, and can be turned using carbide tooling.
Nominal Composition
Base: Co
Cr: 27-32
W: 3-6
C: 0.9-1.4
Others: Ni, Fe, Si, Mn, Mo
Hardness HRC: 36-45
Typical UTS: 850 MPa
UNS: R30006, R30106, W73006, W73036
AMS: 5387, 5373, 5788, 7239
Stellite 21
Mechanical properties are very dependent upon the manufacturing route and subsequent heat treatments. Excellent cavitation, galling, and metal-to-metal sliding wear resistance. Not recommended for severe hard particle abrasion. Excellent resistance to thermal and mechanical shock.
Nominal Composition
Base: Co
Cr: 26-29
Mo: 4.5-6.0
C: <0.35
Ni: <3.0
Others: Fe, Si, Mn
Hardness HRC: 27-40 (Can work harden up to 48)
Typical UTS: 710 MPa
UNS: R30021, W73041, W73021
AMS: 5385, 5819
Stellite 12
Intermediate alloy between Stellite 6 and Stellite 1. Increased resistance to low-angle erosion, abrasion, and severe sliding wear while maintaining reasonable impact and cavitation resistance.
Nominal Composition
Base: Co
Cr: 27-32
W: 7.5-9.5
C: 1.4-2.0
Others: Ni, Fe, Si, Mn
Hardness HRC: 45-51
Typical UTS: 740 MPa
UNS: R30012, W73012, W73042
AMS: Not Listed
Stellite 1
Very high abrasion & corrosion resistance. Well suited to applications involving extreme low-angle erosion and severe abrasion, some sacrifice in toughness.
Nominal Composition
Base: Co
Cr: 28-32
W: 11-13
C: 2.0-3.0
Others: Ni, Fe, Si, Mn, Mo
Hardness HRC: 50-58
Typical UTS: 550 MPa
UNS: R30001, W73031, W73001
AMS: Not Listed
Stellite 3
Abrasion and solid particle erosion resistance. Excellent metal-to-metal wear resistance. Resists galling when mated with other Stellite alloys. Nearly impossible to hardface crack-free. Withstands very little impact.
Nominal Composition
Base: Co
Cr: 30.5
W: 12.5
C: 2.3
Others: Ni, Fe, Si
Hardness HRC: 48-63
Typical UTS: 551 MPa
UNS: R30001, R30103
AMS: Not Listed
Stellite 4
Greater wear resistance than Stellite 6. Extremely good high-temperature strength. Very good galling resistance. Very low coefficient of friction when rubbed against itself and hard steels.
Nominal Composition
Base: Co
Cr: 30
W: 14
C: 1
Others: Mn, Fe, Si, Ni
Hardness HRC: 45-49
Typical UTS: 757 MPa
UNS: R30404
AMS: Not Listed
Stellite 13
Good general resistance to wear, erosion, and oxidation. Retains good ductility and machinability.
Nominal Composition
Base: Co
Cr: 28
W: 20
Ni: 5.0
C: 0.9
Others: V, Fe, Si, Mn
Hardness HRC: 45-50
Typical UTS: 790 MPa
UNS: Not Listed
AMS: Not Listed
Stellite 19
Resistant to severe shock and has excellent red-hardness. Impact resistance comparable to high-speed steels. Excellent resistance to corrosion from many common chemicals.
Nominal Composition
Base: Co
Cr: 31
W: 10.5
C: 1.9
Si: 1.0
Others: Ni, Fe
Hardness HRC: 51-53
Typical UTS: 725 MPa
UNS: Not Listed
AMS: Not Listed
Stellite 20
One of the most abrasion-resistant standard cobalt-base alloys. Good corrosion resistance. Great for environments that need chemical and abrasion resistance. Low shock resistance.
Nominal Composition
Base: Co
Cr: 32.5
W: 17.5
C: 2.5
Ni: <2.0
Others: Mo, Fe, Si
Hardness HRC: 53-62
Typical UTS: 550 MPa
UNS: Not Listed
AMS: Not Listed
Stellite 25
Special low-carbon alloy with exceptional thermal fatigue resistance. Resists hot metal-on-metal wear. Also has hot corrosion resistance.
Nominal Composition
Base: Co
Cr: 20
W: 15
C: 0.1
Others: Ni, Fe, Si, Mo, Mn
Hardness HRC: 20-45 (dependent on amount of work hardening)
Typical UTS: 925 MPa
UNS: R30605
AMS: Not Listed
Stellite 31
High tensile and creep properties. Superior in stress-rupture properties compared to many commercially available alloys. Excellent resistance to thermal and mechanical shock. Resistant to oxidizing and reducing atmospheres up to 2100°F.
Nominal Composition
Base: Co
Cr: 26
W: 7.5
C: 0.5
Ni: 10.5
Others: Mo, Fe, Si
Hardness HRC: 25-35 (dependent on amount of work hardening)
Typical UTS: 740 MPa
UNS: R30031
AMS: 5382
Stellite 190
Highly abrasion-resistant. Minimize cooling stresses to avoid service conditions that involve severe mechanical or thermal shock. Reasonable corrosion resistance to brackish water and mildly oxidizing environments.
Nominal Composition
Base: Co
Cr: 27
W: 14
C: 3.3
Fe: <3
Others: V, Fe, Si, Mn
Hardness HRC: 45-50
Typical UTS: 790 MPa
UNS: Not Listed
AMS: Not Listed
Stellite 250
Heat-resistant alloy with excellent resistance to thermal shock, oxidation, and hot corrosion. Designed to resist carburization and sulphidization of furnace components, and is machinable.
Nominal Composition
Base: Co
Cr: 28
Fe: 20
C: 0.1
Si: 1.0
Others: Mn
Hardness HRC: 18-29
Typical UTS: 551 MPa
UNS: Not Listed
AMS: Not Listed
Stellite 694
High matrix strength at elevated temperatures. Good resistance to wear, creep, erosion, thermal fatigue, and oxidation.
Nominal Composition
Base: Co
Cr: 28.5
W: 19.5
Ni: 5.0
C: 0.9
Others: V, Fe, Si, Mn
Hardness HRC: 44-50
Typical UTS: 830 MPa
UNS: Not Listed
AMS: Not Listed
Stellite 700 Series
The Stellite 700 series of alloys includes Stellite 703, 704, 706, 712 and 720. By substituting the W in the traditional Stellite alloys with Mo, a family of alloys maintains a high corrosion resistance in a complex or reducting corrosive environment with excellent wear resistance.
Nominal Composition: See 700 Series Data Sheet
Hardness HRC: See 700 Series Data Sheet
Typical UTS: See 700 Series Data Sheet
UNS: See 700 Series Data Sheet
AMS: Not Listed
Stellite Star J
Recommended for use in extreme conditions of wear, abrasion, and heat. High hot hardness and superior strength. Improved abrasion resistance at the cost of ductility.
Nominal Composition
Bal: Co
Cr: 32.5
W: 17.5
C: 2.5
Fe: 2.0
Ni: 2.0
Others: Mn, Si
Hardness HRC: 50-63
Typical UTS: 427 MPa
UNS: R31001, R30102
AMS: Not Listed