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1.2311 (40 CrMnMo 7)

AISI P 20

Chemical composition % C Si Mn P S Cr Mo Ni Cu
0.38 0.40 1.43 0.012 0.071 1.82 0.17 0.16 0.11

Plastic mould steel for medium and large moulds. Because this material is supplied pre-tempered to 950 - 1,150 N/mm², it is likewise suitable for general machine building components. By comparison, 1.2312 is easier to machine due to the sulphur content but does not polish. 1.2311 can be polished and photo-etched. Both materials can be gas and bath nitrided.



Tempering diagram
Hardness temperature: 850°C
Sample cross section: rect. 50 mm

1.2311-12-1a

Surface treatment
Nitriding:
Hardening development in the nitrided case
—— Gas nitriding in amonia stream: 50 hours at 520°C
––– Bath nitriding (Tenifer process) 2 hours at 570°C

1.2311-12-1b

TTT diagram for continuous cool down

Austenitisation temperature: 840°C
Dwell time: 15 minutes

1.2312-1c

Microstructure mass diagram
—— Water cooling
------- Oil cooling
– • – Air cooling

1...Work piece edge
2...Work piece centre
3...Jominy sample: distance from the front face

1.2312-1d
 

Obtainable as the following products:

 

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1.2311 P 20

Plastic mould steel for medium-sized and large moulds