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Steels for moulds, tools and dies

Mould bases and hot runners

W 1.2312

W 1.2312

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

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.

Standard

• AFNOR: 40 CMD8S
• DIN: 40 CrMnMoS 8-6
• WERKSTOFF W 1.2312
• AISI: ≈ P20+S

Chemical analysis

Typical values (weight%)

C S P max Si Mn Cr Mo
.4 .060 .012 .3 1.5 1.9 .2

Mechanical properties

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

Physical properties

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

Dimensional program

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″)

For more technical details :

 


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.