Composition Ranges According to AISI , the only practical difference between 304 or 316 and 304L or 316L is carbon content. The carbon ranges are 0.08% maximum for 304 and 316 and 0.03% maximum for the 304L and 316L types. All other element ranges are essentially the same (nickel range for 304 is 8.00-10.50%
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Standards Development The American Iron and Steel Institute (AISI) and the American Society for Testing and Materials (ASTM) are industry standards for iron and stee manufacturing and grading. While both are concerned with iron and steel, these agencies have a lot of differences. One is that AISI is a North American association while ASTM