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Subject: Re: Naphtenic acid corrosion

Date: 07/11/02 at 6:33 AM
Posted by: Stefan Steinheimer
E-mail: stefan.steinheimer@ed.tessag.com
Message Posted:

In Reply to: Naphtenic acid corrosion posted by Pepe Gonzalez on 08/18/00 at 5:55 PM:

We are currently working on a VDU unit here in Germany and are trying to find a suitable material
for the heater tubes. A 317L as recommended can not be used due to the required design temperature of
the tubes of 550°C, which by far exceeds the temperature range given in the code (ASME andGerman DIN)
for this or equivalent DIN material.
The main point which limits the application range of 317 L to max 400°C as per German code is the
intergranular corrosion..
From the available literature it is not clear whether a material such as DIN 1.4529 (austenitic steel
5.5 %Mo, with a copper content of 2% ) can be the proper choice for such a ´high temperature VDU application´
It is also not clear whether a carbon steel with a chromium content of greater than 12%, in combination of course
with 3% Molybdenum, could provide sufficient protection. Such a material would at least not be susceptible to
intergranular corrosion at elevated temperatures.


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