Advice required (904l) 1

[Valving]

For acidic applications, 904L is required but it is hard to source.
What can be the alternative material considering corrossion resistance?
Thanks in advance for comments.

 

[metengr]

Temperature, concentration, type of acid, flow.....?

 

[EdStainless]

They type of acid, concentrations,temperature and impurities are critical.
There are very few applications where 904L would be the first or even second choice.

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P.E. Metallurgy, Plymouth Tube

 

[moltenmetal]

I am unaware of any service adequately resisted by 904L that is not also adequately resisted by alloy C, though I stand to be corrected. That's not so hard to source- it's just expensive.

So what you're likely asking for is, what alternative alloys are as resistant to your service as 904L would be? To know that, we need details- lots of them.

 

[Valving]

thanks for input.
It is phosphoric acid plant , process water.
temp is max 50 deg. C but content of p.w. is not given.
I was trying to judge depending on corrosion rates of 904L
Check valves were required with 904L but hard to supply.

 

[EdStainless]

Phos acid is a good match with 904L.
There is quite a bit of data that indicates that modern 6% Mo superaustenitic alloys do well in this also, such as 654SMO, AL-6XN, 1925hMo.

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P.E. Metallurgy, Plymouth Tube