In the early days (early 80s of the 20th century), this steel was used as cast steel to replace the second-generation duplex stainless steel HuaNickel 00Cr22Ni5Mo2N (2205) with insufficient corrosion resistance. In the late 80s, it began to be used as a texturing material for pipeline systems, and subsequently became an important corrosion-resistant material for oil and gas development, seawater environments, flue gas desulfurization (FGD), desalination, chemical and other applications.