M303 Extra Steel

M303 Extra Steel

Steel name: M303 Extra
Diagram No.: 2262
Mat.No. (Wr.Nr.) designation: ~1.2316
Chemical composition in weight %: 0.27% C, 0.30% Si, 0.65% Mn, 14.50% Cr, 1.00% Mo, 0.85% Ni, +N and others
Steel group: Martensitic steels
Properties: BÖHLER M303 EXTRA is a corrosion resistant martensitic chromium steel, offering excellent toughness, corrosion and wear resistance. It is characterized by improved machinability and polishability.
Applications: Moulds for chemically agressive plastics, e.g.: moulds for household appliances, extrusion tools, moulds for fittings.
Reference: Not shown in this demo version.

Heat Treatment
Hardening: 1000 to 1020 °C (1830 – 1870 °F)/oil, N2, salt bath (400 to 450 °C [750 – 840 °F]). After through-heating, hold for 15 to 30 minutes. Obtainable hardness: 51 to 53 HRC.
Tempering: Slow heating to tempering temperature immediately after hardening. Time in furnace 1 hour for each 20 mm (0.79 inch) of workpiece thickness, but at least 2 hours. We recommend the tempering at least twice. A third tempering for stress relieving 30 – 50 °C (85 – 120 °F) below tempering temperature is of advantage. For information on the average hardness figures obtained after tempering please refer to the tempering chart.
Diagram note: No data

Tempering Diagram

Price: 20.00 US $
Buy Online Tempering Diagram

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CCT and TTT Diagrams of Steels
CCT and TTT Diagram Calculating Service
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Hardenability Calculating Service
Macro Defects in Steel
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Non-Metallic Inclusions in Steel
Semiconductor Etchants

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