ST12 isimbi yakajairika inotonhora yakakungurutswa, ST12 ndeyeyeGerman standard (DIN1623), yakaenzana neEN10130 DC01, JS SPCC, American standard ASTM A1008 CS.ST12 isimbi yakajairika yakakungurutswa, ST13 kutsika giredhi inotonhora yakakungurutswa simbi, ST14 yakadzika. kudhirowa giredhi inotonhora yakakungurutswa simbi, ST12 inoratidzwa seyakajairwa simbi nhamba, uye q195, spcc, DC01 giredhi zvinhu zvakangofanana.