Stainless steel machining details
AISI | Grade | Number | AFNOR | Machining costs |
---|---|---|---|---|
Inox 303 | X8CrNiS18-9 | 1.4305 | Z8CNF18-09 | €€ |
Inox 304L | X2CrNi18-9 | 1.4307 | Z2CN18-10 | €€€ |
Inox 316L | X2CrNiMo17-12-2 | 1.4404 | Z3CND17-11-02 | €€€€ |
Inox 430F | X6CrMoS17 | 1.4105 | Z8CF17 | € |
Inox 420B | X30Cr13 | 1.4028 | Z33C13 | €€€ |
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, …)