304L vs weak sulfuric acid

Yes you will have corrosion but the rate will be very low at this concentration.

What is your feed stock?
How is the concentration measured is it total volume or in a water layer or what?
How do you plan to deal with the H2SO4 in your process?

If you raise the temperature or concentrate the H2SO4 this changes everything.

Come back with a little more information as there are a few other problems that may present themselves.

Someone with a set of tables will probably give you some number for the initial conditions

The feedstock is a nitrated aromatic delivered as a cake. The nitration is performed via a mixed acid route.

The cake is insoluble in water. The wgt % H2SO4 noted is for the cake wash water - only one phase, etc.

Washing is done at ambient temperature. The wash water could be used in another washing operation but it will not be heated nor will the H2SO4 be recovered. The wash water will eventually be collected and then passed through a waste water treatment system.

Hope this has helped.