W 1.2312 – Steels For Molds Tools And Die

Short Description:

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...


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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″)

PDF: http://www.industeel.info/wp-content/http://www.bz-aluminium-steels.com/uploads/uploads/2016/01/DS-MOLD-W12312.pdf


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