I have seen 30-35% peroxide used up to 80C.
I don't see this as worrying.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

The tank will be fine. But the decomposition rate of the peroxide may be unacceptable at that temperature.

Thanks for your answers,

btrueblood,
What does the decomposition rate means?
What test will you recommend to do in order to test the steel?

"Decomposition rate" means that at those temperatures, 50% peroxide is falling back apart again to O2 and H2O.

It happens thermally and is also catalyzed by surfaces including the surface of 316/L.

The material is at no risk of corrosion BY the peroxide. But you would do well to pickle the surface to remove residual iron, as iron is definitely a catalyst for the decomposition of peroxide.

(www.spitfireresearch.com)

Molten gave you the answer that I would have.

"What test will you recommend to do in order to test the steel?"

There are lab-level tests to measure the evolution of O2 gas with the sample material immersed in the fluid that is going to decompose. In the rocket biz, we used to do this with hydrazine, a similar chemical. The test is potentially dangerous - as the peroxide begins to decompose, it releases heat, which can bootstrap to a thermal runaway condition (think rocket engine); the water boils to steam and whoosh (or bang, if you don't give it a way to vent).

I'm sure this type of testing has been done by others, but I couldn't find any easy links to good data. A few hours in an engineering library would probably find some.

SS loves an oxidizing environment.
I see no risk with the alloy.
Handling the evolved oxygen will be your biggest issue.
And if there are any non-metals in the system they will require very very careful selection.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

Hi All,
Thanks for your answers.
I appreciate it.