There are many grades of stainless steel in the classification, commonly used are 304, 310 or 316 and 316L, then the same is 316 stainless steel flange behind an L is what Thought? In fact, it is very simple. Both 316 and 316L are stainless steel flanges containing molybdenum, while the content of molybdenum in 316L stainless steel flanges is slightly higher than that in 316 stainless steel. Stainless steel With molybdenum added to the flange, the overall performance is much better than 304 or 310 stainless steel. Generally 316 stainless steel is suitable for use in sulfuric acid concentration below 15% or above 85%So its resistance to chloride erosion is very strong, and is usually used in Marine environments.

The carbon content in 316L stainless steel is only 0.03, which is very suitable for welding parts that can not be annealed and need strong corrosion resistance.
In other words, 316 stainless steel flanges and 316L stainless steel flanges are more corrosion resistant than 304 or 310 stainless steel flanges. But also can withstand the ocean and work Atmospheric erosion.
316 stainless steel flange has good welding performance. Can be applied to all welding methods, in the welding process can be according to the purpose of 316CB, 316L or 309CB is used as filler for welding. The 316 stainless steel flange must be properly heat treated after welding to obtain better corrosion resistance.