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Kennametal Stellite Stellite® 250

Category Metal , Nonferrous Metal , Cobalt Alloy , Superalloy
Manufacturer Kennametal Stellite
Trade Name Stellite®
Port Ningbo port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF Kennametal Stellite Stellite® 250.pdf
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Material Notes:
Resistant to heat, thermal shock, thermal cycling, oxidation, and hot corrosion from flue gas, slags, and molten copper. Not recommended for use in abrasive wear.Applications:heat treatment furnaces, metallurgical industrial furnaces such as copper smelters, baskets, grates, tray, slab skids, reheat furnaces, gas and pulverized coal burners, discharge rolls and channels, radiant tube supports, and parts in contact with molten slags and molten copper.Corrosion: Good resistance to oxidation by air or air SO2 mixtures, and corrosive resistance by H2S up to 1249°C (2280°F). Not corroded by molten copper, but it is attacked by molten zinc and aluminum. In aqueous media, withstands attack by dilute sulfuric acid and by boiling concentrated nitric acid, but is attacked by reducing acids such as HCl.Machinability: Has tendency to work harden, can be machined with grade C² or C³ tungsten carbide tools. A stress relief treatment of 935°C (1650°F) for 4 hours and slow cooling will aid machining.Data provided by the manufacturer, Deloro Stellite, Inc.Product of former Deloro Stellite Inc. Similar alloys include Stellite 251, Stellite 238, UMCO-50/51, Haynes 150, Esco 72
Physical Properties Metric English Comments
Density 8.05 g/cc
0.291 lb/in³
Mechanical Properties Metric English Comments
Hardness, Brinell 263
263
55

@Temperature 950 °C
55

@Temperature 1740 °F
107

@Temperature 800 °C
107

@Temperature 1470 °F
163

@Temperature 700 °C
163

@Temperature 1290 °F
180

@Temperature 600 °C
180

@Temperature 1110 °F
Hardness, Knoop 271
271
Converted from Rockwell C hardness.
Hardness, Rockwell A 46
46
Converted from Rockwell C
Hardness, Rockwell B 101
101
Converted from Rockwell C
Hardness, Rockwell C 18 - 29
18 - 29
Tensile Strength, Ultimate 551 MPa
79900 psi
Tensile Strength, Yield 314 MPa
45500 psi
Elongation at Break 8.0 %
8.0 %
Modulus of Elasticity 217 GPa
31500 ksi
Charpy Impact 36.6 J
27.0 ft-lb
Charpy V-notch at RT
Thermal Properties Metric English Comments
CTE, linear 16.8 µm/m-°C

@Temperature 20.0 - 1000 °C
9.33 µin/in-°F

@Temperature 68.0 - 1830 °F
Thermal Conductivity 9.10 W/m-K
63.2 BTU-in/hr-ft²-°F
Melting Point 1380 - 1395 °C
2520 - 2543 °F
Solidus 1380 °C
2520 °F
Liquidus 1395 °C
2543 °F
Component Elements Properties Metric English Comments
Carbon, C 0.10 %
0.10 %
Chromium, Cr 28 %
28 %
Cobalt, Co 49.9 %
49.9 %
As remainder
Iron, Fe 20.5 %
20.5 %
Manganese, Mn 0.75 %
0.75 %
Silicon, Si 0.75 %
0.75 %
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