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Effect of high temperature on citric acid passivate stainless steel

2005

We have an application whereby stainless steel AISI 440C (passivated by citric acid) precision balls has to be moulded into plastic at moulding temperature between 170-250 °C. Will the passivated surface be degraded in this kind of moulding condition ?

Koh Kee Hun
- Singapore

I assume that the 440C has been hardened. What kind of citric acid passivation did you do on it? For this kind of steel the passivation needs to be done correctly.

If the steel was hardened and passivated correctly the molding temperature will not hurt the passivation.

Lee Kremer
Stellar Solutions, Inc.

McHenry, Illinois

2005

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