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Permissible amount of Mo in SS 340L in HNO3 application

Permissible amount of Mo in SS 340L in HNO3 application

Permissible amount of Mo in SS 340L in HNO3 application

(OP)
We know that 304L is the best choice for nitric acid environment due to oxidation issue involved with Mo, when you buy SS304L from the market, it comes with some percentace ( close to 0.03%) of Mo in the form of impuritiy. The questions I have
1. what is the max permissible Mo that can be accepted for nitric acid application
2. what could be the possible effect of Mo in such a small amount if exposed to nitric acid

RE: Permissible amount of Mo in SS 340L in HNO3 application

In the high purity 310 that is used for strong nitric acid service they often limit Mo to 0.10%.
I don't have any data on Mo in 304 handy.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

RE: Permissible amount of Mo in SS 340L in HNO3 application

In my experience, there is little difference in the nitric acid resistance of 304L and 316L (which can have 2.0-3.0% Mo) at low temperatures (say less than 60 deg C). It's only when higher temperatures are encountered that the molybdenum content has a detrimental effect. So don't be concerned if the temperature is low.

http://uk.linkedin.com/pub/terry-roberts/28/a9a/a10

RE: Permissible amount of Mo in SS 340L in HNO3 application

I have a suggestion, bit out of line;- why don't you people take advantage on the offer from one of most prestigious corrosion resitance experts in the world, the Outokumpu? They have a free corrosion manual, it should be in every engineers bag, it's very useful. Go to Outokumpu website and register for a free copy, it will be shippeed to your door for free! Alternatively, contact your local rep, they should have spare copies in hand. I just got the revised last edition from Outokuumpu's local rep. He came to my work and hand it over to me personally. I also introduced to him few of my young coleagues, because he is a valuable contact. Any corrosion question is replied (for free) promptly, particularly if you call the rep (they have speedy channels at hand).
Cheers,
hr2vessels

RE: Permissible amount of Mo in SS 340L in HNO3 application

Shopping for heats of 304L with Mo < 0.10 should not be that difficult.  

gr2vessels, I have the same manual, shipped to me from Finland - very useful.   

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