Info about Polastorm's stainless steel propellers

Casting technology for stainless steel
POLASTORM stainless steel propellers are made of ASTM A890-4A duplex stainless steel, processed by solution heat treatment.

The composition of ASTM A890-4A steel is notable for the presence of copper (Cu) and a relatively high chromium (Cr) content.

• Copper is primarily used to improve acid resistance.

• Chromium is the defining alloying element of stainless steel. A higher chromium content ensures extra corrosion resistance .

All POLASTORM stainless steel propellers utilize a helical exhaust design and the best interchangeable hub system in the marine industry. The best proven designs have been selected to optimally match specific engine power groups, with a wide range of propeller pitch options.

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