Q
What is the most important and decisive factor in choosing mould steel?
A
Forming method - can be selected from two basic material types.
A) Hot working tool steel, which can withstand relatively high temperatures during die casting, forging and extrusion.
B) Cold working tool steel, which is used for blanking and shearing, cold forming, cold extrusion, cold forging and powder pressurized forming.
Plastics - Some plastics produce corrosive by-products, such as PVC plastics. Condensation, corrosive gases, acids, cooling/heating, water or storage conditions caused by long shutdowns can also cause corrosion. In these cases, stainless steel die steel is recommended.
Die Size - Pre-hardened steel is often used in large-size dies. Integral hardened steel is often used in small size dies.
Mould usage times - High hardness steel should be used for long-term use (>1000000 times), and its hardness is 48-65HRC. Medium to long-term use (100000 to 1000000 times) Focus today:
The die shall be made of pre-hardened steel with a hardness of 30-45HRC. Soft steel should be used for short-term use (< 100000 times). Its hardness is 160-250HB.
Surface Roughness - Many plastic mould manufacturers are interested in good surface roughness. When sulfur is added to improve metal cutting performance, the surface quality will decrease. Steel with high sulphur content also becomes more brittle.

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