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Ensinger PEI

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.
Vendors: No vendors are listed for this material. Please click here if you are a supplier and would like information on how to add your listing to this material.
 
Physical PropertiesMetricEnglishComments
Density  7.70 g/cc
@Temperature 400 °C		0.278 lb/in³
@Temperature 752 °F
 7.73 g/cc
@Temperature 300 °C		0.279 lb/in³
@Temperature 572 °F
 7.75 g/cc
@Temperature 200 °C		0.280 lb/in³
@Temperature 392 °F
 7.78 g/cc
@Temperature 100 °C		0.281 lb/in³
@Temperature 212 °F
 7.80 g/cc
@Temperature 20.0 °C		0.282 lb/in³
@Temperature 68.0 °F
 
Mechanical PropertiesMetricEnglishComments
Hardness, Rockwell C 3232Pre-Hardened
 5353Heat Treated
Tensile Strength, Ultimate 1100 MPa160000 psiPre-Hardened
 1940 MPa281000 psiHeat Treated
Tensile Strength, Yield  890 MPa
@Strain 0.2 %		129000 psi
@Strain 0.2 %		Pre-Hardened
 1540 MPa
@Strain 0.2 %		223000 psi
@Strain 0.2 %		Heat Treated
Elongation at Break 9.0 %9.0 %Heat Treated
 15 %15 %Pre-Hardened
Reduction of Area 28 %28 %Heat Treated
 55 %55 %Pre-Hardened
Modulus of Elasticity  190 GPa
@Temperature 400 °C		27600 ksi
@Temperature 752 °F		Longitudinal
 200 GPa
@Temperature 300 °C		29000 ksi
@Temperature 572 °F		Longitudinal
 209 GPa
@Temperature 200 °C		30300 ksi
@Temperature 392 °F		Longitudinal
 212.5 GPa
@Temperature 100 °C		30820 ksi
@Temperature 212 °F		Longitudinal
 214.5 GPa
@Temperature 20.0 °C		31110 ksi
@Temperature 68.0 °F		Longitudinal
Charpy Impact Unnotched 25.0 J/cm²119 ft-lb/in²Heat Treated; 2uE
 60.0 J/cm²286 ft-lb/in²Pre-Hardened; 2uE
 
Thermal PropertiesMetricEnglishComments
CTE, linear  10.8 µm/m-°C
@Temperature 20.0 - 100 °C		6.00 µin/in-°F
@Temperature 68.0 - 212 °F
 11.1 µm/m-°C
@Temperature 20.0 - 200 °C		6.17 µin/in-°F
@Temperature 68.0 - 392 °F
 11.3 µm/m-°C
@Temperature 20.0 - 300 °C		6.28 µin/in-°F
@Temperature 68.0 - 572 °F
 11.5 µm/m-°C
@Temperature 20.0 - 400 °C		6.39 µin/in-°F
@Temperature 68.0 - 752 °F
Specific Heat Capacity 0.460 J/g-°C
@Temperature 20.0 °C		0.110 BTU/lb-°F
@Temperature 68.0 °F
Thermal Conductivity  23.0 W/m-K
@Temperature 20.0 °C		160 BTU-in/hr-ft²-°F
@Temperature 68.0 °F
 23.4 W/m-K
@Temperature 100 °C		162 BTU-in/hr-ft²-°F
@Temperature 212 °F
 23.9 W/m-K
@Temperature 200 °C		166 BTU-in/hr-ft²-°F
@Temperature 392 °F
 24.7 W/m-K
@Temperature 300 °C		171 BTU-in/hr-ft²-°F
@Temperature 572 °F
 25.1 W/m-K
@Temperature 400 °C		174 BTU-in/hr-ft²-°F
@Temperature 752 °F
 
Component Elements PropertiesMetricEnglishComments
Carbon, C 0.38 %0.38 %
Chromium, Cr 13.5 %13.5 %
Iron, Fe 84.8 %84.8 %As Remainder
Molybdenum, Mo 0.1 %0.1 %
Silicon, Si 0.9 %0.9 %
Vanadium, V 0.3 %0.3 %

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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