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, …)

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