Catalyzes the hydrolysis of N(2)-succinylarginine into N(2)-succinylornithine, ammonia and CO(2). 2 H(+) + 2 H2O + N(2)-succinyl-L-arginine = CO2 + N(2)-succinyl-L-ornithine + 2 NH4(+) Amino-acid degradation; L-arginine degradation via AST pathway; L-glutamate and succinate from L-arginine: step 2/5. Homodimer. Belongs to the succinylarginine dihydrolase family.