Ubalo lokongezwa kwezinto ezihlengahlengisiweyo zesinyithi esityhidiweyo kwisithando somlilo sokunyibilikisa:

gt=Gz(Xa-Xb)/Cd(kg)

gt-Ukongeza umyinge we-arhente yokunyusa i-C okanye ezinye ii-alloys (kg)

Gz- Ubunzima bubonke bentsimbi etyhidiweyo eziko (kg)

Xa-ixabiso ekujoliswe kulo lokwakheka kwentsimbi enyibilikisiweyo (%)

Xb-Uhlalutyo lwexabiso lokubunjwa kwentsimbi etyhidiweyo kwisithando somlilo (%)

I-CC-eyandisa i-arhente okanye omnye umxholo we-alloy (%)

Ireyithi yokufunxa yezithako ezisebenzayo (100% yi-1)

I-iron etyhidiweyo i-C kunye ne-SI igqithise ukubunjwa ekujoliswe kuyo, yongeza i-scrap ukunciphisa i-C, ukubala kwe-SI gt=Gz(Xb-Xa)/b

b-umxholo wento elungelelanisiweyo kwi-scrap

Idatha ye-empirical yile: yongeza i-34kg ye-iron / t, ukunciphisa i-0.1% C kunye nokunciphisa i-0.05% Si.