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BG42 High Performance Bearing Steel
Categories: Metal; Ferrous Metal; Martensitic; Stainless Steel

Material Notes: Martensitic, stainless high speed steel that combines the tempering, hot hardness and hardness retention characteristics of M50 high speed steel with the corrosion and oxidation resistance of type 440C stainless. Although often used for aerospace bearings and other critical applications, its excellent wear resistance and corrosion resistance makes it a superior choice for use in cutlery applications.

Information provided by Latrobe and the reference(s).

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Physical PropertiesOriginal ValueComments
Density 0.280 lb/in³
 
Mechanical PropertiesOriginal ValueComments
Hardness, Rockwell C 30
@Temperature 649 °C
 51
@Temperature 538 °C
 56.5
@Temperature 482 °C
 58
@Temperature 427 °C
 60
@Temperature 316 °C
 62
@Temperature 316 °C
 63
@Temperature 204 °C
 63
@Temperature 93.3 °C
 64.5
@Temperature -17.8 °C
 64.5
@Temperature 93.3 °C
Hardness, Vickers 310
@Temperature 649 °C
 530
@Temperature 538 °C
 660
@Temperature 427 °C
 720
@Temperature 316 °C
 780
@Temperature 204 °C
 805
@Temperature -17.8 °C
 805
@Temperature 93.3 °C
Modulus of Elasticity 31990 ksi
 26190 ksi
@Temperature 482 °C
Modulus of Rigidity 10210 ksiAt 900°F
 12550 ksiAt 78°F
Poissons Ratio 0.27
Machinability 55 - 60 %1% Carbon Steel
 
Thermal PropertiesOriginal ValueComments
CTE, linear 9.81 µm/m-°C
@Temperature -73.0 - 21.0 °C
 11.03 µm/m-°C
@Temperature 21.0 - 149 °C
 12.33 µm/m-°C
@Temperature 21.0 - 538 °C
 
Component Elements PropertiesOriginal ValueComments
Carbon, C 1.15 %
Chromium, Cr 14.5 %
Iron, Fe 78.35 %
Manganese, Mn 0.50 %
Molybdenum, Mo 4.0 %
Silicon, Si 0.30 %
Vanadium, V 1.2 %

References for this datasheet.

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