316L stainless steel contains molybdenum, and its corrosion resistance in chloride environments is better than 304 stainless steel. It is especially suitable for marine environments, chemical equipment and other occasions that require resistance to highly corrosive media.
316L stainless steel contains high nickel element, so its stability and oxidation resistance at high temperatures are relatively good, and it is suitable for high temperature environments, such as heat treatment equipment, petrochemical industry and other fields.
304 stainless steel is easy to cut, bend and form, suitable for making various complex shapes, and has good welding performance. However, 316L stainless steel has relatively poor processing and welding properties due to its molybdenum content and low carbon content.
To sum up, 316L stainless steel pipe is better than 304 stainless steel pipe in terms of corrosion resistance, high temperature resistance, processing and weldability, so in some special application scenarios, 316L stainless steel pipe is more suitable.
Steel Composition by Type: 304 vs 304L vs 316 vs 316L
304: 18% chromium, 8% nickel, max 0.08% carbon
304L: 18% chromium (20% max), max 0.03% carbon
316: 16% chromium, 10% nickel, 2% molybdenum, max 0.08% carbon
316L: 16% chromium, 10% nickel, 2% molybdenum, max 0.03% carbon
When Should I Choose 316 Stainless Steel Instead of 304 Steel?
There are several instances where 316 steel offers greater resistance to environmental factors. Generally, 316 steel is specified for environments where 304 stainless steel lacks adequate corrosion resistance:
Marine and aquatic applications,
Salt and ice are present in the environment
Environments with strict cleanliness requirements
Equipment is exposed to harsh chemical cleaners
