Kukhona amafomula ahlukahlukene kanye nezibali zokubala eziku-inthanethi ezivumela umuntu abale kalula isisindo sensimbi engagqwali.

Insimbi engagqwali ihlukaniswe ngaphansi kwezigaba ezi-5 futhi lezi zihlanganisa uchungechunge lwama-200 no-300 lwensimbi engagqwali olwaziwa ngokuthi ama-austenitic stainless steels.Bese kuba nochungechunge lwe-400, okuyizinsimbi ezingenasici ze-ferritic.Uchungechunge lwama-400 kanye nochungechunge lwama-500 lubizwa ngokuthi izinsimbi ezingenasici ze-martensitic.Bese kuba khona izinhlobo ze-PH zensimbi engagqwali, okuyizinga lemvula eliqina izinsimbi ezingenasici.

Futhi okokugcina, kukhona ingxube yezinsimbi ezingenasici ze-ferritic ne-austenitic, ezaziwa ngokuthi izinsimbi ezingenasici eziyi-duplex.