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Rulon Bearings

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Crucible Steel Nitriding #135 Modified Steel, AISI 4140 Modified
Categories: Metal; Ferrous Metal; Alloy Steel; AISI 4000 Series Steel

Material Notes: Nitriding #135 steel is a modification of AISI 4140 specifically designed to be nitrided for high surface hardness and abrasion resistance.

Information provided by Crucible Industries

Key Words: AISI 4140 Modified
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Physical PropertiesOriginal ValueComments
Density 0.280 lb/in³
 
Mechanical PropertiesOriginal ValueComments
Hardness, Rockwell C 28 - 30
Hardness, Rockwell HR30N 86at surface
 62
@Thickness 0.508 mm
 70
@Thickness 0.381 mm
 82
@Thickness 0.254 mm
 84
@Thickness 0.203 mm
 86
@Thickness 0.127 mm
 87
@Thickness 0.0762 mm
Hardness, Vickers 1110at surface
 420
@Thickness 0.508 mm
 600
@Thickness 0.381 mm
 950
@Thickness 0.254 mm
 1040
@Thickness 0.203 mm
 1120
@Thickness 0.127 mm
 1140
@Thickness 0.0762 mm
Modulus of Elasticity 30000 ksi
 
Thermal PropertiesOriginal ValueComments
CTE, linear 7.00 µin/in-°F
@Temperature 21.1 - 121 °C
 7.10 µin/in-°F
@Temperature 21.1 - 204 °C
 7.25 µin/in-°F
@Temperature 21.1 - 427 °C
Thermal Conductivity 288 BTU-in/hr-ft²-°F
@Temperature 93.3 °C
 
Component Elements PropertiesOriginal ValueComments
Aluminum, Al 1.15 %
Carbon, C 0.40 %
Chromium, Cr 1.6 %
Iron, Fe 95.6 %as balance
Manganese, Mn 0.60 %
Molybdenum, Mo 0.35 %
Silicon, Si 0.30 %

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NCRUC919 / 160370

Aluminum Castings

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