1.2767 (45 NiCrMo 16)

AFNOR 435 NCD 5

Chemical composition % C Si Mn Cr Mo Ni
0.45 0.20 0.40 1.30 0.30 4.00

Tool steel for highly stressed closed-die coining, cold hobbing tools, cold shearing knives as well as the manufacture of plastic moulds.

Tempering diagram
Hardness temperature: 850°C
Sample cross section: rect. 20mm

1.2767-a

Heat treatment diagram

1.2767-1b

Repair welding
There is the danger of fracture during welding work, as is general with tool steels.

TTT diagram for continuous cool down

Austenitisation temperature: 840°C
Dwell time: 15 minutes

623...435 Hardness in HV
1...98 Microstructure components in %
0.14...5.6 Cooling parameters, i.e. cooling duration from 800 - 500°C
in seconds x 10 (power -2)
20 K/min...0.2 K/min
Cooling speed in K/min in the 800 - 500°C range
B...Bainite

1.2767-2a

Microstructure mass diagram
B...Bainite

—— Water cooling
------ Oil cooling
– • – Air cooling
1... Work piece edge
2... Work piece centre
3... Jominy sample: distance from front face

1.2767-2b

Isothermic TTT diagram
Austenitisation temperature: 840°C
Dwell time: 15 minutes

1.2767%203a.Seite

Dependence of grain hardness and hardening depth on the work piece diameter
Hardness temperature: 850°C
Hardening medium: oil

1.2767%203b.Seite
 

Obtainable as the following products:

 

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1.2767 45 NiCrMo 16

Tool steel for highly-stressed solid constructed embossing dies, cold hobbing tools, cold shear knives and for the manufacture of plastic moulds