International Mold Steel NAK55 Precipitation Hardened Mold Steel

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International Mold Steel NAK55 Precipitation Hardened Mold Steel
Categories:	Metal; Ferrous Metal; Tool Steel; Mold Steel
Material Notes:	Description: NAK55 is a precipitation, or age-hardened mold steel with a through hardness of approximately 40 HRc. NAK55 is ideal for use in plastic and rubber molds and other applications where impact resistance is not critical. It is a super clean, Vacuum-Arc Remelted steel with uniform grain structure, uniform hardness and excellent dimensional stability. Unique Characteristics: Vacuum-Arc Remelt manufacturing process. 40 HRc hardness. Uniform hardness throughout, even in heavy sections. When welded, NAK leaves no witness lines after re-aging. Uniform grain structure with no pin holes, inclusions or hard spots. Machines up to 50% faster than 30 HRc P20 mold steels. Never needs stress relieving, even after heavy machining. Information provided by International Mold Steel.
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Mechanical Properties	Metric	English	Comments

Hardness, Rockwell C	40	40
Tensile Strength, Ultimate	1250 MPa	182000 psi
Tensile Strength, Yield	1010 MPa @Strain 0.2 %	146500 psi @Strain 0.2 %
Elongation at Break	15.6 %	15.6 %	Elongation in 2" (longitudinal)
Reduction of Area	39.8 %	39.8 %
Modulus of Elasticity	207 GPa @Temperature 23.0 °C	30000 ksi @Temperature 73.4 °F
Charpy Impact	7.59 J	5.60 ft-lb	V-Notch, Transverse
	9.76 J	7.20 ft-lb	V-Notch, Longitudinal

Electrical Properties	Metric	English	Comments
Magnetic Permeability	<= 380	<= 380
Magnetic Coercive Force, H_c	14 Oe	14 Oe
Magnetic Saturation Flux Density, B_max	16350 Gauss	16350 Gauss	Saturate Magnetism
Magnetic Remanence, B_r	8500 Gauss	8500 Gauss	Residual Magnetism

Thermal Properties	Metric	English	Comments
CTE, linear	11.3 µm/m-°C @Temperature 20.0 - 100 °C	6.30 µin/in-°F @Temperature 68.0 - 212 °F
	12.6 µm/m-°C @Temperature 20.0 - 200 °C	7.00 µin/in-°F @Temperature 68.0 - 392 °F
	13.5 µm/m-°C @Temperature 20.0 - 300 °C	7.50 µin/in-°F @Temperature 68.0 - 572 °F
Thermal Conductivity	41.33 W/m-K @Temperature 93.3 °C	286.8 BTU-in/hr-ft²-°F @Temperature 200 °F
	42.19 W/m-K @Temperature 204 °C	292.8 BTU-in/hr-ft²-°F @Temperature 400 °F

Component Elements Properties	Metric	English	Comments
Aluminum, Al	1.0 %	1.0 %
Carbon, C	0.15 %	0.15 %
Copper, Cu	1.0 %	1.0 %
Iron, Fe	92.95 %	92.95 %
Manganese, Mn	1.5 %	1.5 %
Nickel, Ni	3.0 %	3.0 %
Silicon, Si	0.30 %	0.30 %
Sulfur, S	0.10 %	0.10 %

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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NIMS00 / 17379

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