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Mould bases and hot runners
4140 is a chromium-manganese-molybdenum grade designed for plastic mold industry. This grade is normally delivered in a prehardened condition at a hardness level of 33/37HRC. The grade has a fully homogeneous martensite-bainite microstructure. 4140 grade has specific sulfur addition (0.060% typical) in order to increase strongly its machinability. Compared to AISI P20 grade, 30% increase in milling speed and 300% increase in drilling speed can be expected. At constant cutting speed, tool life is multiplied a least by 5 when replacing P20 by 4140 grade.
4140 is not suitable for polishing requirements.
This grade is typically used for:
Typical values (weight%).
Typical values for plates air quenched and tempered (thickness 45 mm – 1.8”).
Typical delivery sizes
|20 – 600 mm
(.79″ – 23.6″)
|1500 – 2500 mm
(59″ – 98.4″)