317L (00Cr19Ni13Mo3, UNS S31726) are molybdenum-based alloy austenitic stainless steel. With a stronger resistance to chemical corrosion and high ductility, stress corrosion resistance, compressive strength and high temperature performance.It is a low-carbon level or L level, this level has in the process of welding and heat treatment during the allergy of the role of performance. 317L stainless steel alloy than conventional chromium - nickel stainless steel to better resist sulfuric acid corrosion. It has excellent corrosion resistance, can withstand a higher concentration of the solution of corrosion.