AISI 4140
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  • Description
  • Parameter
A prehardened mold steel (311-345 HB / 33-37 HRC) with improved machinability

41X40 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. 41X40 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 41X40 grade.

41X40 is not suitable for polishing requirements.

This grade is typically used for:
1.Plastic injection molds for thermoplastics
2.Extrusion dies for thermoplastics
3.Compression molds

Chemical Analysis
Typical values (weight%)
C S P max Si Mn Cr Mo
0.4 0.060 0.012 0.3 1.5 1.9 0.2

Mechanical Properties
Typical values for plates air quenched and tempered (thickness 45 mm – 1.8”).
Hardness YS 0.2 UTS Elongation Reduction
of area
Elastic modulus
HB MPa ksi MPa ksi % Z% GPa ksi
Longitudinal
direction
320 920 133 1075 156 9 40 205 29745
Longitudinal
direction
320 900 131 1060 154 8 35 205 29745

Delivery Conditions
Typical delivery sizes
Thickness Width
20 – 120 mm
(.79″ – 4.7″)
1500 – 2500 mm
(59 – 98.4″)
120 – 600 mm
(4.7″ – 23.6″)
1500 – 2100 mm
(49″ – 82.7″)
Mould Bases And Hot Runners
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