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Kennametal Stellite Stellite® 21
Categories: Metal; Nonferrous Metal; Cobalt Alloy; Superalloy

Material Notes: Excellent high temperature strength, high toughness. Solution treat at 1191-1204°C, rapid air cool, age between 538-871°C to increase hardness and strength at the expense of impact and ductility.

Applications: turbine blades and vanes, hot die applications, components in combustion or exhaust systems where high strength to 816°C and oxidation to 1093°C is required, used as medical and dental components as well as remelt stock.

Corrosion:Excellent resistance to body fluids and has been used for medical implants, dental fixtures, and surgical equipment. Good resistance to cavitation corrosion.

Machinability: best in solution treated condition. Carbide tipped tools and low speeds and feeds should be used to avoid work hardening. Lubrication is normally used.

Wear: Excellent galling resistance when self-mated or mated with Stellite alloy-6. Resistance to cavitation erosion nearly as good as Stellite alloy 6 and as good or better at high loads. Lower carbon content makes it inferior to Stellite alloy 6 for low stress abrasion resistance.

Data provided by the manufacturer, Deloro Stellite Inc.

Product of former Deloro Stellite Inc. Simlar to Vitallium, ASTM F75, HS21

Key Words: AMS 5385, ASTM A732 Gr.21, MIL-C-13358
Vendors: Visit metalmen for your metals needs. Products include special chemistry, tight tolerances, custom tempers, odd dimensions/forms, and small quantities. Phone 1-800-767-9494.

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Physical PropertiesMetricEnglishComments
Density 8.31 g/cc0.300 lb/in³
 
Mechanical PropertiesMetricEnglishComments
Hardness, Brinell 237237
 101
@Temperature 871 °C
101
@Temperature 1600 °F
 137
@Temperature 649 °C
137
@Temperature 1200 °F
 143
@Temperature 538 °C
143
@Temperature 1000 °F
 148
@Temperature 427 °C
148
@Temperature 800 °F
Hardness, Knoop 278278Converted from Brinell
Hardness, Rockwell A 6464Converted from Rockwell C hardness. Beyond normal Rockwell B range, for comparison only.
Hardness, Rockwell B 103103Converted from Rockwell C hardness.
Hardness, Rockwell C 22 - 3222 - 32
Hardness, Vickers 244244Converted from Brinell
Tensile Strength, Ultimate 724 MPa105000 psi
Tensile Strength, Yield 517 MPa75000 psi
Elongation at Break 9.0 %9.0 %
Modulus of Elasticity 248 GPa36000 ksi
Compressive Yield Strength 1359 MPa197100 psi
Charpy Impact 13.6 J10.0 ft-lbV-Notch
 
Thermal PropertiesMetricEnglishComments
CTE, linear  14.1 µm/m-°C
@Temperature 20.0 - 315 °C
7.83 µin/in-°F
@Temperature 68.0 - 599 °F
 14.3 µm/m-°C
@Temperature 20.0 - 427 °C
7.94 µin/in-°F
@Temperature 68.0 - 801 °F
 14.7 µm/m-°C
@Temperature 20.0 - 538 °C
8.17 µin/in-°F
@Temperature 68.0 - 1000 °F
 15.1 µm/m-°C
@Temperature 20.0 - 649 °C
8.39 µin/in-°F
@Temperature 68.0 - 1200 °F
 15.6 µm/m-°C
@Temperature 20.0 - 816 °C
8.67 µin/in-°F
@Temperature 68.0 - 1500 °F
Thermal Conductivity 14.7 W/m-K102 BTU-in/hr-ft²-°F
Melting Point 1338 - 1366 °C2440 - 2491 °F
Solidus 1338 °C2440 °F
Liquidus 1366 °C2491 °F
 
Component Elements PropertiesMetricEnglishComments
Boron, B <= 0.0070 %<= 0.0070 %
Carbon, C 0.25 %0.25 %
Chromium, Cr 27 %27 %
Cobalt, Co 62.25 %62.25 %As remainder
Iron, Fe 1.5 %1.5 %
Molybdenum, Mo 5.5 %5.5 %
Nickel, Ni 2.75 %2.75 %
Silicon, Si 0.75 %0.75 %

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NS21A / 18859

Ensinger PEI

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