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Tool & Mould Materials<br />
Corrosion-Resistant Mould Steel for PET Bottle<br />
Production Is Engineered for Machinability<br />
Deutsche Edelstahlwerke GmbH<br />
supplies Corroplast FM specialty<br />
mould steel to manufacturers of<br />
PET bottles and other users of complex<br />
moulds who are seeking greater<br />
moulding efficiency. This steel is<br />
engineered to be highly machinable<br />
without suffering loss of corrosion<br />
resistance. Analysis of the<br />
material has documented a<br />
well-balanced ratio of hardness,<br />
corrosion resistance<br />
and machinability.<br />
These desirable properties<br />
are attributable to the<br />
proportion of the alloy components<br />
chromium, nickel,<br />
manganese and sulphur in<br />
the steel, which took developers<br />
two years to optimize.<br />
A particular development challenge<br />
was to homogenize the material<br />
structure with the correct amount of<br />
sulphur so as to maximize machinability<br />
without impairing performance.<br />
This necessitated careful adjustment<br />
of the melting process and subsequent<br />
secondary metallurgic treat-<br />
ment. Additionally, thermodynamic<br />
calculations were used to minimize<br />
formation of embrittling delta ferrite.<br />
The homogeneity of Corroplast FM<br />
ensures its corrosion resistance even<br />
when heat, condensation and coolant<br />
are prevalent, and provides stability<br />
for filigree components and for any<br />
moulds with minimal cavity spacing.<br />
Corroplast FM mould steel can be<br />
purchased as rolled or forged plate<br />
1,000 mm wide and from 50 to 400<br />
mm thick. The supplier will machine<br />
it in its processing plant if the customer<br />
wishes, delivering it with cooling<br />
bore holes or other features.<br />
» Deutsche Edelstahlwerke GmbH<br />
Witten, Germany<br />
www.dew-stahl.com
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