Assab Steels 718HH Plastic Mold Material

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Assab Steels 718HH Plastic Mold Material
Categories:	Metal; Ferrous Metal; Alloy Steel; Chrome-moly Steel
Material Notes:	IMPAX SUPREME is a premium-quality vacuum-degassed Cr-Ni-Mo-alloyed steel which is supplied in the hardened and tempered condition. IMPAX SUPREME is manufactured to consistently high quality standards with a very low sulfur content, giving a steel with the following characteristics: Good polishing and photo etching properties Good machinability High purity and good homogeneity Uniform hardness Applications: Injection moulds for thermoplastics Extrusion dies for thermoplastics Blow moulds Forming tools, press-brake dies (possibly flame hardened or nitrided) Structural components, shafts. AISI P20 modified, W.-Nr. 1.2738
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Physical Properties	Metric	English	Comments

Density	7.81 g/cc	0.282 lb/in³
	7.75 g/cc @Temperature 200 °C	0.280 lb/in³ @Temperature 392 °F

Mechanical Properties	Metric	English	Comments
Hardness, Brinell	325	325	tempering at 600°C
	340 - 380	340 - 380	hardness supplied.
	450	450	tempering at 400°C
	500	500	tempering at 200°C
Tensile Strength, Ultimate	979 MPa @Thickness 25.4 mm, Temperature 200 °C	142000 psi @Thickness 1.00 in, Temperature 392 °F	R_m. Bar. 310 HB
	1080 MPa @Diameter 25.4 mm	156000 psi @Diameter 1.00 in	R_m. Bar. 310 HB
Tensile Strength, Yield	827 MPa @Diameter 25.4 mm	120000 psi @Diameter 1.00 in	R_p0.2. bar. Hardness: 310 HB
	986 MPa @Diameter 25.4 mm	143000 psi @Diameter 1.00 in	R_p0.2. bar. 310 HB
Modulus of Elasticity	205 GPa	29700 ksi
	200 GPa @Temperature 200 °C	29000 ksi @Temperature 392 °F
Impact Test	30.0 J @Diameter 25.4 mm, Temperature 20.0 °C	22.1 ft-lb @Diameter 1.00 in, Temperature 68.0 °F	310 HB
	130 J @Diameter 25.4 mm, Temperature 200 °C	95.9 ft-lb @Diameter 1.00 in, Temperature 392 °F	310 HB

Thermal Properties	Metric	English	Comments
CTE, linear	12.7 µm/m-°C @Temperature 20.0 - 200 °C	7.06 µin/in-°F @Temperature 68.0 - 392 °F
Specific Heat Capacity	0.460 J/g-°C @Temperature 20.0 °C	0.110 BTU/lb-°F @Temperature 68.0 °F
Thermal Conductivity	29.1 W/m-K @Temperature 20.0 °C	202 BTU-in/hr-ft²-°F @Temperature 68.0 °F
	29.5 W/m-K @Temperature 200 °C	205 BTU-in/hr-ft²-°F @Temperature 392 °F

Component Elements Properties	Metric	English	Comments
Carbon, C	0.37 %	0.37 %
Chromium, Cr	2.0 %	2.0 %
Iron, Fe	94.722 %	94.722 %
Manganese, Mn	1.4 %	1.4 %
Molybdenum, Mo	0.20 %	0.20 %
Nickel, Ni	1.0 %	1.0 %
Silicon, Si	0.30 %	0.30 %
Sulfur, S	0.0080 %	0.0080 %

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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NASSAB23 / 15041

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