International Mold Steel S-Star 420 ESR Stainless Steel for Plastic Molds

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International Mold Steel S-Star 420 ESR Stainless Steel for Plastic Molds
Categories:	Metal; Ferrous Metal; Stainless Steel; Tool Steel; Mold Steel
Material Notes:	Characteristics: Excellent corrosion resistance High hardness; up to 53 HRC Superb mirror-finish surface Minimal distortion, less than 0.03% after heat treatment Excellent internal matrix by ESR Uniform texture surface by photo etching and electrical discharge machining Applications: Ultra mirror finish plastic molds - Lens Ultra-hard, Corrosion-resistance plastic molds - Medical Instruments, Cosmetic containers, Food containers Example Resins: PMMA, PC, PP, PS, PVC, PE, PF, Flame resisting compounds Information provided by International Mold Steel.
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Physical Properties	Original Value	Comments

Density	7.70 g/cc @Temperature 400 °C
	7.73 g/cc @Temperature 300 °C
	7.75 g/cc @Temperature 200 °C
	7.78 g/cc @Temperature 100 °C
	7.80 g/cc @Temperature 20.0 °C

Mechanical Properties	Original Value	Comments
Hardness, Rockwell C	32	Pre-Hardened
	53	Heat Treated
Tensile Strength, Ultimate	1100 MPa	Pre-Hardened
	1940 MPa	Heat Treated
Tensile Strength, Yield	890 MPa @Strain 0.2 %	Pre-Hardened
	1540 MPa @Strain 0.2 %	Heat Treated
Elongation at Break	9.0 %	Heat Treated
	15 %	Pre-Hardened
Reduction of Area	28 %	Heat Treated
	55 %	Pre-Hardened
Modulus of Elasticity	190 GPa @Temperature 400 °C	Longitudinal
	200 GPa @Temperature 300 °C	Longitudinal
	209 GPa @Temperature 200 °C	Longitudinal
	212.5 GPa @Temperature 100 °C	Longitudinal
	214.5 GPa @Temperature 20.0 °C	Longitudinal
Charpy Impact Unnotched	25.0 J/cm²	Heat Treated; 2uE
	60.0 J/cm²	Pre-Hardened; 2uE

Thermal Properties	Original Value	Comments
CTE, linear	10.8 µm/m-°C @Temperature 20.0 - 100 °C
	11.1 µm/m-°C @Temperature 20.0 - 200 °C
	11.3 µm/m-°C @Temperature 20.0 - 300 °C
	11.5 µm/m-°C @Temperature 20.0 - 400 °C
Specific Heat Capacity	0.460 J/g-°C @Temperature 20.0 °C
Thermal Conductivity	23.0 W/m-K @Temperature 20.0 °C
	23.4 W/m-K @Temperature 100 °C
	23.9 W/m-K @Temperature 200 °C
	24.7 W/m-K @Temperature 300 °C
	25.1 W/m-K @Temperature 400 °C

Component Elements Properties	Original Value	Comments
Carbon, C	0.38 %
Chromium, Cr	13.5 %
Iron, Fe	84.8 %	As Remainder
Molybdenum, Mo	0.1 %
Silicon, Si	0.9 %
Vanadium, V	0.3 %

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NIMSA00 / 217529

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