M238 Steel

M238 Steel

Steel name: M238
Diagram No.: 2260
Mat.No. (Wr.Nr.) designation: 1.2738
DIN designation: 40CrMnNiMo8-6-4
Chemical composition in weight %: 0.38% C, 0.30% Si, 1.50% Mn, 2.00% Cr, 0.20% Mo, 1.10% Ni
Steel group: Plastic mould steels
Properties: Hardened and tempered to 290 – 330 HB or as productversion ”High-Hard“ with 355 – 395 HB. General, no heat treatment required. If heat treatment is carried out for special purposes, e.g. for obtaining an increase in strength, the following instructions should be observed.
Applications: Large moulds (over 600 mm / 23.62 inch) for plastic processing. Mould carrier frames for the plastic moulds. Components for general mechanical engineering and tool manufacture.
Reference: Not shown in this demo version.

Heat Treatment
Hardening: 840 to 860 °C (1544 – 1580 °F) / oil. After through soaking, hold for 15 – 30 minutes. Obtainable hardness: approx. 54 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 / cooling in air. We recommend the tempering twice. For information on the average hardness figures obtained after tempering please refer to the tempering chart.
Diagram note: Hardening temperature: 850 °C (1562 °F). Specimen size: square 50 mm (1.97 inch).

Tempering Diagram

Price: 20.00 US $
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Carbides in Steel
CCT and TTT Diagrams of Steels
CCT and TTT Diagram Calculating Service
Hardenability Diagrams of Steels
Hardenability Calculating Service
Macro Defects in Steel
Metal Etchants
Non-Metallic Inclusions in Steel
Semiconductor Etchants

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