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Rulon Bearings

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 PropertiesMetricEnglishComments
Density 7.83 g/cc0.283 lb/in³(AISI W5)
 
Mechanical PropertiesMetricEnglishComments
Hardness, Vickers 210 - 300210 - 300
Modulus of Elasticity 205 GPa29700 ksi(AISI W5)
Poissons Ratio 0.280.28Calculated (AISI W5)
Shear Modulus 80.0 GPa11600 ksiTypical for steel
 
Electrical PropertiesMetricEnglishComments
Electrical Resistivity 0.0000300 ohm-cm0.0000300 ohm-cm(AISI W5)
 
Thermal PropertiesMetricEnglishComments
CTE, linear  10.4 µm/m-°C
@Temperature 20.0 - 100 °C
5.78 µin/in-°F
@Temperature 68.0 - 212 °F
(AISI W5)
 12.2 µm/m-°C
@Temperature 0.000 - 300 °C
6.78 µin/in-°F
@Temperature 32.0 - 572 °F
(AISI W5)
 13.8 µm/m-°C
@Temperature 0.000 - 500 °C
7.67 µin/in-°F
@Temperature 32.0 - 932 °F
(AISI W5)
Specific Heat Capacity 0.461 J/g-°C
@Temperature 0.000 - 100 °C
0.110 BTU/lb-°F
@Temperature 32.0 - 212 °F
(AISI W5)
Thermal Conductivity 48.0 W/m-K333 BTU-in/hr-ft²-°F(AISI W5)
 
Processing PropertiesMetricEnglishComments
Processing Temperature 175 - 345 °C347 - 653 °FTempering Temperature (AISI W5)
 760 - 845 °C1400 - 1550 °FHardening Temperature (AISI W5)
Annealing Temperature 760 - 790 °C1400 - 1450 °F(AISI W5)
 
Component Elements PropertiesMetricEnglishComments
Carbon, C 0.90 - 1.0 %0.90 - 1.0 %
Chromium, Cr <= 0.30 %<= 0.30 %
Copper, Cu <= 0.25 %<= 0.25 %
Iron, Fe 97.3 - 99.1 %97.3 - 99.1 %As remainder
Manganese, Mn <= 0.50 %<= 0.50 %
Nickel, Ni <= 0.25 %<= 0.25 %
Phosphorus, P <= 0.030 %<= 0.030 %
Silicon, Si <= 0.35 %<= 0.35 %
Sulfur, S <= 0.030 %<= 0.030 %

References for this datasheet.

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