‌904L is a super austenitic stainless steel with high alloying properties. Its main components include 20Cr-24Ni-4.3Mo-1.5Cu‌. 904L Stainless Steel Pipe has a very low carbon content and Adding Cu has good corrosion resistance, especially in dilute acid environments. AISI 904L Pipe according to specification ASTM A312, no matter Seamless pipe or Welded Pipe. It is designed for environments with harsh corrosive conditions. Adding Cr and Ni, the Stainless Steel 904L Pipe also exhibits good resistance to stress related corrosion cracking.