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Rulon Bearings

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JIS SK4M Water-Hardening Tool Steel
Categories: Metal; Ferrous Metal; Tool Steel; Water-Hardening Steel

Material Notes: Cold rolled strip, pen nib string

Key Words: JIS G3311(88) SK4M. Comparable to AISI W5 Tool Steel, UNS T72305
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Physical PropertiesOriginal ValueComments
Density 7.83 g/cc(AISI W5)
 
Mechanical PropertiesOriginal ValueComments
Hardness, Vickers 210 - 300
Modulus of Elasticity 205 GPa(AISI W5)
Poissons Ratio 0.28Calculated (AISI W5)
Shear Modulus 80.0 GPaTypical for steel
 
Electrical PropertiesOriginal ValueComments
Electrical Resistivity 0.0000300 ohm-cm(AISI W5)
 
Thermal PropertiesOriginal ValueComments
CTE, linear 10.4 µm/m-°C
@Temperature 20.0 - 100 °C
(AISI W5)
 12.2 µm/m-°C
@Temperature 0.000 - 300 °C
(AISI W5)
 13.8 µm/m-°C
@Temperature 0.000 - 500 °C
(AISI W5)
Specific Heat Capacity 0.461 J/g-°C
@Temperature 0.000 - 100 °C
(AISI W5)
Thermal Conductivity 48.0 W/m-K(AISI W5)
 
Processing PropertiesOriginal ValueComments
Processing Temperature 175 - 345 °CTempering Temperature (AISI W5)
 760 - 845 °CHardening Temperature (AISI W5)
Annealing Temperature 760 - 790 °C(AISI W5)
 
Component Elements PropertiesOriginal ValueComments
Carbon, C 0.90 - 1.0 %
Chromium, Cr <= 0.30 %
Copper, Cu <= 0.25 %
Iron, Fe 97.3 - 99.1 %As remainder
Manganese, Mn <= 0.50 %
Nickel, Ni <= 0.25 %
Phosphorus, P <= 0.030 %
Silicon, Si <= 0.35 %
Sulfur, S <= 0.030 %

References for this datasheet.

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