The difference between 316 stainless steel and 316L stainless steel

by:Caiyi     2019-12-28
The difference between 316 stainless steel and 316L stainless steel 316L stainless steel continues to reduce carbon content on the basis of 316 stainless steel, making corrosion resistance stronger. The main difference between 316 stainless steel and 316L stainless steel lies in the carbon content, 316L is less than 0. 03%, 316 is less than 0. 08%. In austenitic stainless steel series, carbon is an element that is easy to cause intergranular corrosion. The lower the carbon content, the smaller the tendency of intergranular corrosion, therefore, 316L stainless steel has stronger corrosion resistance than 316 stainless steel and its price is more expensive than 316. The mechanism of intergranular corrosion caused by carbon element is as follows: the necessary condition for stainless steel to have corrosion resistance is that chromium content must be greater than 10 ~ 12%. When the temperature rises, the diffusion rate of carbon in stainless steel grains is greater than that of chromium. Because the solubility of carbon in austenite is very small at room temperature, about 0. 02% ~ 0. 03%, and the carbon content in general austenitic stainless steel exceeds this value, so the excess carbon continuously diffuses to the austenite grain boundary and combines with chromium to form chromium carbide compounds between crystals, such (CrFe)23C6, etc. The carbon content exceeds 0. 03% unstable austenitic stainless steel is prone to intergranular corrosion in some environments if heat treatment is improper. 316 contains c≤0. 08 with Ni10 ~ 14,316L contains c≤0. 03 with Ni12 ~ 15. Judging from the chemical composition, 316L stainless steel has better mechanical properties and stronger protection ability under the same conditions.
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