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Deloro MDS Stellite20 Rev00

STELLITETM 20 is a cobalt-based alloy that is resistant to wear, galling, and corrosion at high temperatures due to its hard carbide phase dispersed in a cobalt-chromium alloy matrix. It is most abrasion resistant and has good corrosion resistance, making it suitable for applications like slurry pumps, rotary seal rings, and centerless grinder work rests. The alloy shows excellent corrosion resistance in acids like phosphoric and sulfuric acid.

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79 views2 pages

Deloro MDS Stellite20 Rev00

STELLITETM 20 is a cobalt-based alloy that is resistant to wear, galling, and corrosion at high temperatures due to its hard carbide phase dispersed in a cobalt-chromium alloy matrix. It is most abrasion resistant and has good corrosion resistance, making it suitable for applications like slurry pumps, rotary seal rings, and centerless grinder work rests. The alloy shows excellent corrosion resistance in acids like phosphoric and sulfuric acid.

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STELLITETM 20 ALLOY

STELLITETM COBALT-BASED ALLOYS consists 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.

STELLITETM 20 is the most abrasion resistant standard cobalt base alloy. It also has good
corrosion resistance. Whilst it has low shock resistance, it is often the only answer for some
applications such as slurry pumps or chemical resistant parts. Examples include pump sleeves,
rotary seal rings, wear pads, bearing sleeves and centerless grinder work rests.

CORROSION RESISTANCE
The typical electrode potential in sea water at room temperature is -0.2 V (SCE).
StelliteTM 20 shows excellent corrosion resistance in Phosphoric Acid (concentration 60%, 66°C)
and in Sulphuric Acid (concentration 90%, Room Temperature). In Nitric Acid (concentration 60%,
boiling) a good corrosion resistance has been observed.

NOMINAL CHEMICAL COMPOSITION (MASS%)


ALLOY Co Cr W C Others

StelliteTM 20 Bal. 32,5 17,5 2,5 Fe, Ni, Mo, Mn, Si

PHYSICAL PROPERTIES
ALLOY Hardness Density Melting Range

StelliteTM 20 52 – 62 HRC / 570 – 740 HV ~ 8,77 g/cm3 ~ 1260 – 1300°C

NOMINAL HOT HARDNESS (HV resp. DPH) AS CAST


20°C 100°C 200°C 300°C 400°C 500°C 600°C 700°C 800°C 900°C

670 600 552 516 476 441 412 340 245 132

Stellite™, Tribaloy™, Nistelle™, Stelcar™, Jet Kote™, and Delcrome™


are registered trademarks of Kennametal Inc.

Document Number: MDS St20 rev. 00


EXAMPLE FOR TENSILE PROPERTIES AT ROOM TEMPERATURE
Ultimate Tensile Yield Stress Elongation
PRODUCT FORM
Strength Rm Rp (0,2%) A
Tensile Strength and Yield Strength are varying strongly dependent on
<< 1%
manufacturing method and heat treatment.

PRODUCT FORMS
Components

Castings Cladded / Hardfaced PM / HIP parts*


* On special request.

Consumables for Cladding / Hardfacing and Additive Layer Manufacturing (ALM)

Rods TIG-Welding Oxy-Acetylene Welding

Electrode MMA Welding

Powder PTA Cladding Laser Cladding HVOF Spraying

TYPICAL STRUCTURES

Casted StelliteTM 20 Alloy (Investment Casting)

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