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Abrasive wear caused to injecting filled and unfilled plastics
as high pressures can severely affect the mould life and increase
repair and cost. Surface hardness is the most important criterion
used by mould makers in selecting a material for a high wear and
long run applications. However, hardness is not the only factor
that contributes to wear resistance, and using it as an exclusive
parameter can lead to problem.
Beryllium Copper provides excellent resistance to adhesive as well
as abrasive wear when compared with other common mould materials
such as M.S., OHNS, etc. However, it is not recommended for highly
abrasive filled plastics, where only high hardness, high speed tool
steels such as D 2 are suitable. In applications where corrosion
complicates erosion problems, barylium copper's excellent corrosion
resistance when compared to tool steels provides an additional advantage.
Where greater levels of abrasion resistance are required, hard chrome
plating is recommended.
Commonly Used Steels For Moulds:
High Finish Mould Steel 835 M 30 (EN 30 B)
Typical Analysis in %
| C |
Mn |
Ni |
Cr. |
Mo |
| 0.32 |
0.50 |
4.25 |
1.25 |
0.30 |
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