Kunezinhlobo ezahlukene zefomula kanye nezibalo eziku-inthanethi ezivumela umuntu ukubala kalula isisindo sensimbi engagqwali.

Insimbi engagqwali ihlukaniswe ngezigaba ezi-5 futhi lezi zifaka phakathi uchungechunge lwensimbi engagqwali oluyi-200 no-300 olwaziwa ngokuthi ama-austenitic stainless steels. Bese kuba nochungechunge lwe-400, okuyizinsimbi ezingagqwali ze-ferritic. Uchungechunge lwe-400 nochungechunge lwe-500 lubizwa ngokuthi ama-martensitic stainless steels. Bese kuba nezinhlobo ze-PH zensimbi engagqwali, okuyizinsimbi ezingagqwali ze-precipitation hardening grade.

Okokugcina, kukhona ingxube yezinsimbi ezingenalutho ze-ferritic neze-austenitic, ezaziwa ngokuthi izinsimbi ezingenalutho ze-duplex.