Cov khoom siv ntawm cov pa roj carbon steel phaj yog cov pa roj carbon steel los yog carbon steel, uas yog cov hlau uas muaj cov ntsiab lus ntawm cov pa roj carbon tsawg dua 2.11% thiab tsis muaj cov ntsiab lus hlau txhob txwm ntxiv.Ntxiv nrog rau cov pa roj carbon, nws tseem muaj me me ntawm sulfur, silicon, phosphorus, manganese thiab lwm yam khoom.Cov pa roj carbon steel tuaj yeem muab faib ua cov pa roj carbon tsawg, nruab nrab carbon thiab siab carbon raws li cov ntsiab lus carbon;raws li daim ntawv thov, lawv tuaj yeem muab faib ua cov cuab yeej, cov qauv, thiab kev txiav dawb-txiav cov qauv hlau;Raws li txoj kev deoxidation, lawv tuaj yeem muab faib ua boiling steel, semi-tua steel, tua steel, thiab tshwj xeeb tua steel;Raws li txoj kev smelting, nws muaj peev xwm muab faib ua converter steel, qhib hearth rauv hlau thiab hluav taws xob rauv hlau.Cov qib carbon feem ntau suav nrog Q195, Q215, Q235, Q255, Q275 thiab lwm yam