P20 mod. Steel

P20 mod. Steel

Steel name: P20 mod.
Diagram No.: 2187
AISI/SAE designation: P20 mod.
Chemical composition in weight %: No data
Steel group: Plastic mould tool steels
Properties: No data
Applications: No data
Reference: Not shown in this demo version.

Heat Treatment
Hardening: Diagram note: The steel should be soft annealed before hardening. Preheating temperature: 930–1110°F (500–600°C). Austenitizing temperature: 1620°F (880°C). The steel should be heated through to the austenitizing temperature and held at temperature for 30 minutes. Protect the tool against decarburization and oxidation during the hardening process. Quenching media: High speed gas/circulating atmosphere. (Only suitable for small dimensions). Oil (Warm oil 150-175°F (65-80°C)). Martempering bath 570°F (300°C), max. 4 minutes, then air cool.
Tempering: Choose the tempering temperature according to the hardness required by reference to the tempering graph. Temper twice with intermediate cooling to room temperature. Lowest tempering temperature 360°F (180°C) for small inserts, but preferred minimum is 480°F (250°C), unless material is to be nitride or nitrocarburized later. Holding time at temperature minimum 2 hours.
Diagram note: The diagram is valid for small samples 0.6 x 0.6 x 1.6 inch. (15 x 15 x 40 mm) austenitized 30 min. at 1620°F (880°C), quenched in air and tempered 2 + 2 hours.

Tempering Diagram

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