Differences between 316 and 316L stainless steel

Release time:

2022-09-16

316 stainless steel plates are widely used in the chemical industry due to their excellent corrosion resistance. 316L stainless steel is also a derivative of 18-8 type austenitic stainless steel, with 2-3% Mo added. On the basis of 316L stainless steel, many steel types 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 stainless steel.
Most of the existing 316L stainless steel in the market is 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 stainless steel is 10-14%, while the Japanese standard stipulates that the Ni content of 316L stainless steel 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 stainless steel gives it excellent resistance to pitting corrosion 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.
Due to the significant price difference between 316L stainless steel and 304 stainless steel, some unscrupulous traders have sold 304 stainless steel as 316L stainless steel. Due to the fact that 304 stainless steel does not have the ability to resist pitting corrosion, the occurrence of pitting and perforation can cause leakage, which can cause significant safety accidents in the chemical industry. Therefore, it is recommended that purchasing customers conduct a chemical composition analysis of the product to ensure safety.

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