316L is a stainless steel material grade. AISI 316L is the corresponding American grade, and sus 316L is the corresponding Japanese grade. my country's unified digital code is S31603, the standard grade is 022Cr17Ni12Mo2 (new standard), and the old grade is 00Cr17Ni14Mo2, which means it mainly contains Cr, Ni, and Mo, and the numbers represent the approximate percentage. The national standard is GB/T 20878-2007 (current version).

316L is widely used in the chemical industry due to its excellent corrosion resistance. 316L is also a derivative steel of 18-8 type austenitic stainless steel, with 2-3% Mo element added. Based on 316L, many steel grades are also derived, such as 316Ti derived from a small amount of Ti, 316N derived from a small amount of N, and 317L derived from increasing Ni and Mo content.

The Mo content of 316L makes this steel have excellent corrosion resistance and can be safely used in environments containing halogen ions such as Cl-. Since 316L is mainly used for its chemical properties, steel mills have slightly lower surface inspection requirements for 316L (relative to 304), and customers with higher surface requirements should strengthen surface inspection efforts.