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1.2379 (X 153 CrMoV 12)

AISI D2, BS BD2, AFNOR Z160CDV12

Chemical composition % C Si Mn P S Cr Mo Ni V W
1.52 0.34 0.27 0.020 0.013 11.37 0.75 0.19 0.88 0.19

Cold working steel for the manufacture of dimensionally stable high-performance cutting tools with good toughness and the highest level of wear hardness.

This material is obtained from us as a raw material (round and flat), as a precision flat steel, as VarioPlan, as VarioPlan with fine machined thickness, as VarioRond, as a semi-finished product to your specifications and as a hardened or unhardened erosion block.

1.2379 is a ledeburitic 12% chrome steel which requires very high grade heat treatment. The hardening temperature is over 1000°C. In a hardened state, this material is relatively difficult to machine by virtue of its wear resistance.

Austenitisation temperature: 1020°C
Dwell time: 30 minutes

Heat treatment diagram

1.2379-a

Isothermic TTT diagram

1.2379-b

TTT diagram for continuous cool down

Austenitisation temperature: 1080°C
Dwell time: 30 minutes

Hardness in HV
2...100 Microstructure components in %
0.40...59.8 cool down temperature, i.e. cooling duration from 800 - 500°C
in seconds x 10 (power -2)
2...1 K/min cool down speed in K/min in the 800°C
to 500°C range
Ms'-Ms...Area of martensite grain formation boundary
KgM...Martensite grain boundary

1.2379-2a

Microstructure mass diagram
Lk...Ledeburite carbide
RA...Residual austenite
B...Bainite
P...Perlite
K...Carbide

------- Oil cooling
– • – Air cooling
1...Work piece edge
2...Work piece centre

1.2379-2b

Dependence of grain hardness and hardening depth on the work piece diameter
Hardening temperature: 1030°C
Hardening medium:
______ Oil
-------- Air

1.2379%204a.Seite
1.2379%204b.Seite
 

Obtainable as the following products:

 

Downloads

1.2379 D 2/BD 2

Cold work tool steel for the manufacture of punching dies, thread rolling dies as well as shear blades and hardened guide bars with large cross-sections