Assab Steels 618 Plastic Mold Material

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Assab Steels 618 Plastic Mold Material
Categories:	Metal; Ferrous Metal; Alloy Steel; Chrome-moly Steel
Material Notes:	ASSAB 618 is a vacuum-degassed Cr-Ni-Mo-alloy steel which is supplied in the hardened and tempered condition. ASSAB 618 is manufactured to consistently high quality standards with a controlled sulfur content (max. 0.015%) giving a steel with the following characteristics: Good polishing and photo-etching properties Good machinability High purity and good homogeneity Uniform hardness in all dimensions Applications: Injection moulds for thermoplastics Extrusion dies for thermoplastics Blow moulds Forming tools, press-brake dies (possibly flame hardened or nitrided) Machine or 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	290 - 330	hardness supplied.
	325	tempering at 600°C
	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. 310 HB
	143000 psi @Diameter 25.4 mm	R_p0.2. bar. 310 HB
Elongation at Break	14 % @Thickness 25.4 mm	bar; 310 HB
	15 % @Thickness 25.4 mm, Temperature 200 °C	bar; 310 HB
Reduction of Area	49 % @Thickness 25.4 mm, Temperature 20.0 °C	bar; 310 HB
	51 % @Thickness 25.4 mm, Temperature 200 °C	bar; 310 HB
Modulus of Elasticity	205 GPa
	200 GPa @Temperature 200 °C
Impact Test	25.0 J @Diameter 25.4 mm, Temperature 20.0 °C	310 HB
	42.0 J @Diameter 25.4 mm, Temperature 100 °C	bar. 310 HB.
	50.0 J @Diameter 25.4 mm, Temperature 150 °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	94.73 %
Manganese, Mn	1.4 %
Molybdenum, Mo	0.20 %
Nickel, Ni	1.0 %
Silicon, Si	0.30 %

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NASSAB24 / 15042

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