JIS SK4 Water Hardening Tool Steel

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JIS SK4 Water Hardening Tool Steel
Categories:	Metal; Ferrous Metal; Tool Steel; Water-Hardening Steel
Material Notes:	JIS tool steels SK3M, SK5M, SK6M, SK7M, SK1, SK2, SK3, SK4, SK5, SK6, and SK7 differ only in carbon specification; SKC3 includes a vanadium max spec.
Key Words:	JIS G4401(83) SK4. Comparable to SK3M, SK5M, SK6M, SK7M, SK1, SK2, SK3, SK5, SK6, SK7, SKC3, AISI W1 Tool Steel, UNS T72301
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Physical Properties	Metric	English	Comments

Density	7.83 g/cc	0.283 lb/in³	(AISI W1)

Mechanical Properties	Metric	English	Comments
Hardness, Brinell	<= 207	<= 207
Modulus of Elasticity	205 GPa	29700 ksi	(AISI W1)
Poissons Ratio	0.28	0.28	(AISI W1)
Shear Modulus	80.0 GPa	11600 ksi	(AISI W1)

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.0000300 ohm-cm	0.0000300 ohm-cm	(AISI W1)

Thermal Properties	Metric	English	Comments
CTE, linear	10.4 µm/m-°C @Temperature 20.0 - 100 °C	5.78 µin/in-°F @Temperature 68.0 - 212 °F	(AISI W1)
	12.2 µm/m-°C @Temperature 0.000 - 300 °C	6.78 µin/in-°F @Temperature 32.0 - 572 °F	(AISI W1)
	13.8 µm/m-°C @Temperature 0.000 - 500 °C	7.67 µin/in-°F @Temperature 32.0 - 932 °F	(AISI W1)
Specific Heat Capacity	0.461 J/g-°C @Temperature 0.000 - 100 °C	0.110 BTU/lb-°F @Temperature 32.0 - 212 °F	(AISI W1)
Thermal Conductivity	48.0 W/m-K	333 BTU-in/hr-ft²-°F	(AISI W1)

Processing Properties	Metric	English	Comments
Processing Temperature	175 - 345 °C	347 - 653 °F	Tempering Temperature (AISI W1)
	760 - 845 °C	1400 - 1550 °F	Hardening Temperature (AISI W1)
Annealing Temperature	740 - 790 °C	1360 - 1450 °F	(AISI W1)

Component Elements Properties	Metric	English	Comments
Carbon, C	0.90 - 1.0 %	0.90 - 1.0 %
Chromium, Cr	<= 0.30 %	<= 0.30 %
Copper, Cu	<= 0.25 %	<= 0.25 %
Iron, Fe	97.2 - 99.1 %	97.2 - 99.1 %	As Balance
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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