Birta aan birta lahayn waa koox alwaaxyo bir ah oo ka kooban ugu yaraan 11% chromium, oo ka kooban ka hortagta birta in ay miridhsanto sidoo kalena bixisa sifooyin kulaylka u adkaysta.Noocyada kala duwan ee birta aan lahayn waxaa ka mid ah curiyeyaasha kaarboon (laga bilaabo 0.03% ilaa in ka badan 1.00%), nitrogen, aluminium, silicon, sulfur, titanium, nickel, copper, selenium, niobium, iyo molybdenum.Noocyo gaar ah oo birta-la'aanta ah waxaa badanaa lagu magacaabaa AISI lambarkooda saddex-god ah, tusaale, 304 ahama.