JIS SKD12 Tool Steel

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JIS SKD12 Tool Steel
Categories:	Metal; Ferrous Metal; Tool Steel; Air-Hardening Steel; Cold Work Steel
Material Notes:	Medium-Alloy, Air-Hardening Cold Work Tool Steel. High hardenability, high degree of dimensional stability in heat treatment, good wear resistance, fatigue life, toughness, and deep hardening qualities. Applications include cold forming, blanking and bending dies, forming rolls, drill bushings, knurling tools, master dies and gages. Composition reported is for SKD12 while other property data is from AISI A2.
Key Words:	JIS G4404(83) Specification. SKD 12, SKD-12, Comparable to AISI A2, UNS T30102, ASTM A681, FED QQ-T-570, SAE J437, SAE J438, DIN 1.2363, AFNOR Z 100 CDV 5 (Fr), SS14 2260 (Sweden), B.S. BA 2
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Physical Properties	Original Value	Comments

Density	7.86 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Rockwell C	63 - 65 @Temperature 23.0 °C	as air-hardened
	42 - 44
	50 - 52
	56 - 58
	58 - 60
	58 - 60
	58 - 60
	58 - 60
	59 - 61
	60 - 62
Modulus of Elasticity	203 GPa
Bulk Modulus	160 GPa	Typical for steels.
Poissons Ratio	0.30	Calculated
Machinability	65 %	Based on Carbon tool steel.
Shear Modulus	78.0 GPa	Estimated from elastic modulus

Thermal Properties	Original Value	Comments
CTE, linear	10.7 µm/m-°C @Temperature 20.0 - 100 °C
	12.0 µm/m-°C @Temperature 20.0 - 200 °C
	12.7 µm/m-°C @Temperature 20.0 - 300 °C
	13.2 µm/m-°C @Temperature 20.0 - 400 °C
	13.7 µm/m-°C @Temperature 20.0 - 500 °C
	14.0 µm/m-°C @Temperature 20.0 - 600 °C
	14.3 µm/m-°C @Temperature 20.0 - 700 °C
	14.4 µm/m-°C @Temperature 20.0 - 750 °C

Processing Properties	Original Value	Comments
Processing Temperature	175 - 540 °C	Tempering Temperature
	925 - 980 °C	Hardening Temperature
Annealing Temperature	845 - 870 °C

Component Elements Properties	Original Value	Comments
Carbon, C	0.95 - 1.05 %
Chromium, Cr	4.5 - 5.5 %
Iron, Fe	90.8 - 92.9 %	As Balance
Manganese, Mn	0.60 - 0.90 %
Molybdenum, Mo	0.80 - 1.2 %
Silicon, Si	0.40 %
Vanadium, V	0.20 - 0.50 %

References for this datasheet.

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MSTZJSKD12 / 231068

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