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	Original Value	Comments

Density	0.282 lb/in³
	0.280 lb/in³ @Temperature 200 °C

Mechanical Properties	Original Value	Comments
Hardness, Brinell	325	tempering at 600°C
	340 - 380	hardness supplied.
	450	tempering at 400°C
	500	tempering at 200°C
Tensile Strength, Ultimate	142000 psi @Thickness 25.4 mm, Temperature 200 °C	R_m. Bar. 310 HB
	156000 psi @Diameter 25.4 mm	R_m. Bar. 310 HB
Tensile Strength, Yield	120000 psi @Diameter 25.4 mm	R_p0.2. bar. Hardness: 310 HB
	143000 psi @Diameter 25.4 mm	R_p0.2. bar. 310 HB
Modulus of Elasticity	205 GPa
	200 GPa @Temperature 200 °C
Impact Test	30.0 J @Diameter 25.4 mm, Temperature 20.0 °C	310 HB
	130 J @Diameter 25.4 mm, Temperature 200 °C	310 HB

Thermal Properties	Original Value	Comments
CTE, linear	12.7 µm/m-°C @Temperature 20.0 - 200 °C
Specific Heat Capacity	0.110 BTU/lb-°F @Temperature 20.0 °C
Thermal Conductivity	202 BTU-in/hr-ft²-°F @Temperature 20.0 °C
	205 BTU-in/hr-ft²-°F @Temperature 200 °C

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

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NASSAB23 / 15041

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