Cov pa roj carbon steel yog cov hlau uas muaj cov ntsiab lus carbon los ntawm kwv yees li 0.05 txog 2.1 feem pua ntawm qhov hnyav. Lub ntsiab lus ntawm carbon steel los ntawm American Iron and Steel Institute (AISI) hais tias:
tsis muaj cov ntsiab lus yam tsawg kawg nkaus los yog yuav tsum tau rau chromium, cobalt, molybdenum, npib tsib xee, niobium, titanium, tungsten, vanadium, zirconium, los yog lwm yam khoom yuav tsum tau ntxiv kom tau ib tug xav tau alloying nyhuv;
qhov tsawg kawg nkaus rau tooj liab tsis tshaj 0.40 feem pua ;
los yog cov ntsiab lus siab tshaj plaws tau teev tseg rau ib qho ntawm cov ntsiab lus hauv qab no tsis pub tshaj qhov feem pua tau sau tseg: manganese 1.65 ib xees; silicon 0.60 ib xees; tooj liab 0.60 feem pua.
Lub sij hawm carbon steel kuj tseem siv tau rau cov hlau uas tsis yog stainless hlau; Nyob rau hauv no siv carbon steel tej zaum yuav muaj xws li alloy steels. High carbon steel muaj ntau yam kev siv xws li tshuab milling, txiav cov cuab yeej (xws li chisels) thiab siab zog hlau. Cov ntawv thov no xav tau ntau qhov microstructure zoo dua, uas txhim kho qhov toughness.
Cov pa roj carbon steel yog ib qho kev xaiv hlau nrov rau riam ua vim nws cov pa roj carbon ntau, muab cov hniav kom ruaj khov dua. Yuav kom ua tau zoo tshaj plaws ntawm hom hlau no nws yog ib qho tseem ceeb heev uas yuav tsum tau ua kom sov kho kom zoo. Yog tias tsis yog rab riam yuav kawg ua nkig, los yog mos dhau los tuav ntug.
Raws li cov pa roj carbon feem pua cov ntsiab lus nce, steel muaj peev xwm ua kom tawv thiab muaj zog los ntawm kev kho cua sov; txawm li cas los xij, nws ua tsawg dua. Tsis hais txog kev kho cua sov, cov ntsiab lus carbon ntau dua txo qhov kev sib tw. Hauv cov pa roj carbon steel, cov ntsiab lus ntawm cov pa roj carbon ntau dua ua rau cov ntsiab lus melting.
