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Mould bases and hot runners
Material properties
Prehardened Cr-Mn-Mo steel designed for plastic mold industry, with a specific sulfur addition to improve machinability. Compared to 1.2311 grade, 30% increase in milling speed and 300% increase in drilling speed can be expected.
For which tools, for which plastics
Plastic injection mould cores and cavities, extrusion dies for thermoplastics (PE, PP, PS), thermosetting plastics, transparent melts. Not suitable for polishing requirements.
• AFNOR: 40 CMD8S
• DIN: 40 CrMnMoS 8-6
• WERKSTOFF W 1.2312
• AISI: ≈ P20+S
Typical values (weight%)
C | S | P max | Si | Mn | Cr | Mo |
---|---|---|---|---|---|---|
.4 | .060 | .012 | .3 | 1.5 | 1.9 | .2 |
Hardness | Rp 0.2 Yield strength | Rm Tensile strength | Elongation | Reduction of area |
K C V 20°C | Elastic modulus | |||
---|---|---|---|---|---|---|---|---|---|
HB | MPa | ksi | MPa | ksi | % | Z% | J | GPa | ksi |
300 | 850 | 123 | 960 | 139 | 10 | 45 | 20 | 205 | 29733 |
Typical value
Thermal conductivity W.m-1.K-1 | Thermal expansion Coefficient (10-6.K-1) | ||||
---|---|---|---|---|---|
20°C | 20-100°C | 20-200°C | 20-300°C | 20-400°C | Specific heat J/kg.°C |
34 | 11.5 | 11.6 | 12.5 | 12.8 | 470 |
Thickness | Width |
---|---|
7 – 120 mm (.27″ – 4.7″) |
1000 – 2500 mm (39″ – 98.4″) |
120 – 610 mm (4.7″ – 24″) |
1000 – 2100 mm (39″ – 78.7″) |
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