Stellite® alloy 25
|Ni, Fe, Si,
|20-45 HRC||8.31 g/cm3
Stellite® cobalt base alloys consist of complex carbides in an alloy matrix. They are resistant to wear, gall- ing 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.
This tungsten strengthened cobalt-chromium alloy is the cast version of the wrought alloy L605. A special low carbon material has been found to have exceptional thermal fatigue resistance and is useful for tools to work hot steel. The alloy also resists hot metal on metal wear.
Stellite® alloy 25 is resistant to oxidation and carburization up to 1900°F. The alloy resists wet chlorine at ambient temperatures and is resistant to nitric and hydrochloric acids under certain conditions. Exposure testing is recommended to verify performance.
Stellite® alloy 25 forms a protective oxide film during hot metal-on-metal wear which prevents metal trans- fer and damage due to adhesion. The alloy is resistant to thermal cracking and surface fatigue. Since the mi- cro- structure is relatively free of carbide reinforcement, it is not recommended for low stress or low angle particle erosion service.
Carbide tools allow a variety of conventional machining operations. Use positive rake angle to avoid bur- nishing since the alloy work hardens readily. Sharp tools and coolant are recommended for drilling.
Nominal Thermal Expansion Coefficient (from 20°C/68°F to stated temperature)
|100°C (212°F)||200°C (392°F)||300°C (572°F)||400°C (752°F)||500°C (932°F)||600°C (1112°F)||700°C (1292°F)||800°C (1472°F)||900°C (1652°F)||1000°C (1832°F)|
Nominal Tensile Properties at Room Temperature
|Ultimate Tensile Strength Rm||Yield Stress Rp(0.2%)||Elongation||Elastic Modulus|
Nominal Hot Hardness (Brinell Hardness Number) as-cast
|20°C (68°F)||100°C (212°F)||200°C (392°F)||300°C (572°F)||400°C (752°F)||500°C (932°F)||600°C (1112°F)||700°C (1292°F)||800°C (1472°F)||900°C (1652°F)|
Thermal and Electrical Properties
|Approximate value at Room Temperature|
|Thermal conductivity||65 Btu-in/hr/ft2/°F|
|Electrical resistivity||34.9 µ-ohm.inch|
Metal working tools where a combination of metal-on-metal wear, thermal fatigue and hot corrosion restanceare required, such as piercing points, forming tools, and extrusion dies. Also used for furnace hardware.
Castings, welding consumables.
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