After much research I found an article about sulfuric acid at http://chemicalland21.com/industrialchem/inorganic/SULFURIC%20ACID.htm, which was corroborated by another article on sulfuric acid at https://en.m.wikipedia.org/wiki/Aqueous_hydrogen_sulfide, which, leads me to believe that concentrated sulfuric acid will react with strontium in the following way:
I'm not completely certain about the state symbols for sulfuric acid and water. Sulfuric acid may be aqueous, but then it wouldn't be concentrated, and it has to be concentrated in order for this reaction to occur. Water could be a gas because these kinds of reactions require heat.
I hope this helps you. Let me know.