316 Stainless Steel
316 is an austenitic stainless steel containing molybdenum, which gives it markedly better resistance to chlorides and salt water than 304.
- Family /
- Stainless Steels
- Machinability /
- ~40%
- Condition /
- Annealed
- Also called /
- three sixteen
316 is an austenitic stainless steel containing molybdenum, which gives it markedly better resistance to chlorides and salt water than 304.
Machinability is approximate and rated against free-machining 1212 steel at 100%. Higher is easier to cut.
What it is
The molybdenum addition is specifically what resists pitting and crevice corrosion in chloride environments — which is why it is the default choice for marine, coastal and chemical service. 316L is the low-carbon version, preferred where the part will be welded.
How it cuts
Behaves like 304 but slightly tougher and slightly more prone to work hardening. Same requirements: sharp tools, rigid setup, real depth of cut, generous coolant.
What catches people out
Standard 316 can sensitise during welding — chromium carbides form at the grain boundaries in the heat-affected zone and locally destroy the corrosion resistance. If the part is to be welded and then live in salt water, specify 316L.
316 Stainless Steel — Common Questions
What is the difference between 304 and 316 stainless?
- 316 contains molybdenum, which gives significantly better resistance to chlorides and salt water. For coastal, marine or chemical service that difference matters; for general indoor use 304 is usually sufficient and cheaper.
Should I use 316 or 316L?
- Use 316L if the part will be welded. The lower carbon content prevents chromium carbide forming at grain boundaries in the heat-affected zone, which would otherwise destroy corrosion resistance exactly where the weld is.
Other stainless steels
Got a part for 316 Stainless Steel?
Send the drawing or the sample. We will tell you straight what it will take to make.