W 1.2312

A prehardened mold steel (300 HB/32 HRC) with improved machinability

W1.2312 is a chromium – manganese – molybdenum grade designed for plastic mold industry. This grade is normaly delivered in a prehardened condition at a hardness level of 300HB/32HRC. The grade has a fully homogeneous martensite – bainite microstructure. W1.2312 grade has specific sulfur addition (0.060% typical) in order to increase strongly its machinability. Compared to W1.2311 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 W1.2311 by W1.2312 grade. W1.2312 is not suitable for polishing requirements.

Standard

• AFNOR: 40 CMD8S
• DIN: 40 CrMnMoS 8.6
• WERKSTOFF Nb: 1.2312
• AISI: ≈ P20 + S

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 for 300 HB (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
300 850 123 1270 184 10 45 205 29745
Longitudinal
direction
300 820 119 990 144 9 40 205 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″)

For more technical details :

 

W 1.2312

Download the complete datasheet


Technical data and information are to the best of our knowledge at the time of publication. However, they may be subjected to some slight variations due to our ongoing research programmes. Therefore, we suggest that information be verified at time of enquiry or order. Furthermore, in service, real conditions are specific for each application. The data presented here are for the purpose of description only, and can be considered as guarantees only when written formal approval has been provided by our company. Industeel reserves the right to change its product range at any time without prior notice.