Stainless steel machining details

AISIGradeNumberAFNOR Machining costs
Inox 303X8CrNiS18-91.4305Z8CNF18-09 €€
Inox 304LX2CrNi18-91.4307Z2CN18-10 €€€
Inox 316LX2CrNiMo17-12-21.4404Z3CND17-11-02 €€€€
Inox 430FX6CrMoS171.4105Z8CF17 €
Inox 420BX30Cr131.4028Z33C13 €€€

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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