Stainless steel machining details
Austenitic stainless steel
AISI 303: Machinability improved by the addition of sulphur which allows chips to break off and lubricates tools. Poor for welding. Well suited for use in not very harsh environments.
AISI 304L: More resistant to corrosion than the 303, weldable. Difficult to machine.
AISI 316L: Excellent resistance to corrosion in chlorinated environments or in saline water. Suitable for medical, cosmetic, and jewellery uses. Weldable. Difficult to machine.
Ferritic stainless steel
AISI 430F: Easy machining steel, but of lesser quality than the 303. Not weldable.
Martensitic stainless steel
AISI 420B: Quenchable steel for highly stressed part. Used in cutlery, taps, pumps, valves, shafts, pistons, various mechanical parts … low resistance to corrosion.
Stainless steel surface treatment
Stainless steel can be passivated to improve corrosion resistance by removing all pollutant particles from the surface (steel tools, chips, dirt, …)