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40CrMnNiMo8-6-4 Steel
Steel name: 40CrMnNiMo8-6-4
Diagram No.: 5145
Type of diagram: CCT
DIN designation: 40CrMnNiMo8-6-4
Mat. No. (Wr. Nr.) designation: 1.2738
AISI/SAE designation: P20 Mod.
Chemical composition in weight %:
Steel 1: 0.40% C, 1.30% Mn, 1.85% Cr, 0.22% Mo
Steel 2: 0.35-0.40% C, 1.40-1.60% Mn, 1.80-2.00% Cr, 0.15-0.20% Mo, 30 ppm B
Steel group: Plastic mould tool steels
Note: The addition of 30 ppm B to a 40CrMnNiMo8-6-4
steel with 0.38 % C permits a reduction of Mo from
0.22 % down to 0.15 % while maintaining the intrinsic
hardenability and considerably reducing the production
costs. To exploit the effect of B on hardenability, a proper
addition of Ti is required in order to prevent the formation
of BN. The increase of C content up to 0.50 % favors
martensite formation at higher cooling rates, but also
promotes the pearlite formation at lower cooling rates.
Reference: Not shown in this demo version.
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Disclaimer: The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other puposes. There is no representation that the recipient of this literature will receive updated editions as the become available.