S-Star

420 ESR Stainless Steel

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Overview

Diameters: Stocked in the pre-hardened condition (30-34 HRC) can be heat treated to 50-53 HRC
Plates: Stocked in the annealed condition. Can be heat treated to 50-53 HRC.

Applications include:

Ultra mirror finish plastic molds Lens

Ultra-hard, Corrosion-resistance plastic molds
Medical Instruments, Cosmetic container, Food container

Resin PMMA, PC, PP, PS, PVC, PE, PF, Flame resisting compound added resin

Unique Characteristics

Excellent corrosion resistance
High hardness: maximum 53 HRC is obtained
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

Product Brochure

Chemical Composition

Mechanical Properties

Thermal Expansion Coefficient

Thermal Conductivity

Longitudinal Elastic Modulus

Density

Specific Heaty

Physical Properties

Mirror Grade Finish

Heat Treatment

Hardened-Tempered Hardness Maximum hardness of 53HRC is obtained.

Quenching

Tempering Double tempering is recommended for both low and high temperature tempering.

Notes:

For higher corrosion resistance, tempering should be carried out at temperatures of 400°C or lower.
To prevent cracking in EDM, tempering is recommended at 490 to 510°C
When aging dimensional stability is deemed important, carry out low-temperature tempering at 200 to 400°C or sub-zero processing.

Dimensional Change Dimensional change is the smallest by tempering about 300°C