316L is a stainless steel material grade, AISI 316L is the corresponding American grade, and sus 316L is the corresponding Japanese grade. The standard grade is 022Cr17Ni12Mo2 (new standard), which mainly contains Cr, Ni, and Mo, and the number represents the approximate percentage.
chemical composition
C ：≤0.030
Si： ≤1.00
Mn：≤2.00
S ： ≤0.030
P ： ≤0.045
Cr：16.00～18.00
Ni：10.00～14.00
Mo：2.00～3.00
Corrosion resistance
316L is widely used in the chemical industry due to its excellent corrosion resistance. It is also a derivative steel of 18-8 austenitic stainless steel, with 2-3% Mo added. On the basis of 316L, many steel grades have also been derived, such as adding a small amount of Ti to derive 316Ti, adding a small amount of N to derive 316N, and increasing Ni and Mo content to derive 317L.
Most of the existing 316L in the market are produced according to American standards. Due to cost considerations, steel mills generally limit the Ni content of their products as low as possible. The American standard stipulates that the Ni content of 316L is 10-14%, while the Japanese standard stipulates that the Ni content of 316L is 12-15%. According to the minimum standard, there is a 2% difference in Ni content between the American and Japanese standards, which is reflected in the significant price. Therefore, customers still need to see clearly when choosing 316L products, whether they are referring to ASTM or JIS standards.
The Mo content of 316L gives the steel excellent corrosion resistance and can be safely applied in environments containing Cl - and other halogen ions. Due to the fact that 316L is mainly used for its chemical properties, steel mills have slightly lower requirements for surface inspection of 316L (compared to 304), and customers with higher surface requirements need to strengthen surface inspection efforts.
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