Hlau-carbon alloy uas muaj tsawg dua 2 feem pua carbon yog hu ua hlau.
Lub tsib lub ntsiab lus hauv carbon hlau xa mus rau cov khoom tseem ceeb hauv cov tshuaj muaj pes tsawg leeg, xws li C, Si, Mn, S, P (carbon, silicon, manganese, sulfur, phosphorus). Qhov thib ob, cov pa roj yuav inevitably sib xyaw hauv cov txheej txheem steel, suav nrog O, H, N (oxygen, hydrogen, nitrogen). Tsis tas li ntawd, nyob rau hauv cov txheej txheem ntawm Al-Si deoxidation thiab tua, yuav tsum muaj Al nyob rau hauv cov hlau molten, thaum ALS (acid soluble aluminium) Ntau dua los yog sib npaug rau 0. Ntawm 020 feem pua, nws kuj tuaj yeem kho cov nplej
