2738 ISO-BM Steel

Steel name: 2738 ISO-BM
Diagram No.: 2285
Mat.No. (Wr.Nr.) designation: 1.2738
DIN designation: 40CrMnNiMo8-6-4
AISI/SAE designation: ~P20 + Ni
AFNOR designation: 40CMND8
Chemical composition in weight %: 0.36% C, 0.30% Si, 1.50% Mn, 0.020% P, 0.003% S, 2.00% Cr, 0.20% Mo, 1.00% Ni
Steel group: Plastic mould steels
Properties: Mould steel for large dimensions > 400 mm thick. Properties as for grade 2311 ISO-BM, but with improved through-hardening. Nitridable, hard chrome plateable, flame hardenable, polishable, grain-reliable as delivered.
Applications: Tools for compression and injection moulds, bumpers, dashboards, chairs, rubbish bins, bottle crates, television cabinets, etc. Diecasting mould frames: The material is hardened and tempered as forged steel bar in production lengths. Due to the restricted through-hardenability of the grade 2738 ISO-BM, please note that there may be a mixed grain structure at the front surface when sawing to individual lengths.
Reference: Not shown in this demo version.

Heat Treatment
Hardening: Temperature: 880 °C. Duration: 1 minute per mm wall thickness.
Tempering: Temperature: See tempering curve. Duration: 1 hour per 25 mm wall thickness. Cooling: Air.
Diagram note: Average values on samples dia. 25 x 50 mm, hardened at 880 °C in oil. HB converted from HRC.

Tempering Diagram

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