The “L” in 316L simply means “low” which refers to the low carbon content of 0.08% max in 316L stainless steel. This is a major difference between 316 and 316l stainless steel and it determines the operation it is used for. For example, for projects that require the use of stainless steel that is resistant to cracks, the 316L stainless steel is a better choice because of its low carbon content.