M368 MICROCLEAN Steel

M368 MICROCLEAN Steel

Steel name: M368 MICROCLEAN
Diagram No.: 2266
Steel group: PM plastic mould steels
Properties: BÖHLER M368 MICROCLEAN is a martensitic chromium steel produced with powder metallurgy. Due to its alloying concept this steel offers high wear resistance, high toughness and high corrosion resistance – the perfect combination for best application properties.
Applications: For: Mould inserts, moulds for the processing of chemically aggressive plastics containing highly abrasive fillers, moulds and knives for the food-processing industry, moulds for the electronic industry, screws for injection moulding machines, linings for injection moulding cylinders.
Reference: Not shown in this demo version.

Heat Treatment
Hardening: 980 to 1000 °C (1796 – 1830 °F), N2. Following temperature equalisation: 15 – 30 min. Holding time • For big moulds we recommend a low hardening temperature of 980 °C (1796 °F) and a high tempering temperature (> 520 °C / 968 °F).
Tempering: Slowly heat to tempering temperature immediately after hardening. Time in furnace: 1 hour for every 20 mm (0.79 inch) of workpiece thickness but at least 2 hours. Cool in air. We recommend that the steel be tempered 3 times. We recommend for optimal combination of good corrosionand highest wear-resistance and toughness a tempering temperature > 520 °C (968 °F). In this case the corrosionresistance will be suitable for most plastic mould applications. For highest corrosion-resistance optional a tempering at approx. 300 °C (572 °F) is possible. If additional highest requirements for dimensional stability are necessary, an additional subzero-treatment is recommended. Obtainable hardness: 48 – 55 HRc
Diagram note: No data

Tempering Diagram

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