Ib hom yog txias -strengthened carbon steel hlau, los yog txias- kos caij nplooj ntoos hlav steel hlau. Txias- kos cov pa roj carbon caij nplooj ntoos hlav steel hlau yog thawj coj-quenched kom tau txais cov qauv sorbitic, tom qab ntawd nto-phosphate, thiab kos rau qhov loj me me nrog qhov txo qis hauv thaj chaw loj. Cov qauv hlau yog fibrous, muaj lub zog tensile siab thiab elastic txwv, nrog rau zoo khoov thiab torsional zog. Txias- kos lub caij nplooj ntoos hlav steel hlau muaj qhov tseeb qhov tseeb, qhov chaw du, tsis muaj oxidation lossis decarburization tsis xws luag, thiab lub neej qaug zog, ua rau nws siv lub caij nplooj ntoos hlav steel hlau.
Lwm hom carbon caij nplooj ntoos hlav steel hlau yog martensitic muaj zog carbon steel hlau, los yog roj-quenched thiab tempered carbon steel hlau.
Los ntawm quenching thiab tempering, carbon steel hlau tuaj yeem tau txais cov khoom siv zoo. Thaum cov hlau loj me me (φ Tsawg dua lossis sib npaug li 2.0mm), qhov ntsuas lub zog ntawm cov roj-quenched thiab tempered carbon steel hlau yog qis dua cov txias- kos cov pa roj carbon steel hlau tom qab kev kho martensitic. Thaum lub steel hlau txoj kab uas hla yog loj (φ Ntau tshaj los yog sib npaug zos rau 6.0mm), nws yog tsis yooj yim sua kom ua tau raws li qhov yuav tsum tau muaj zog los ntawm kev siv ib tug loj txo piv nyob rau hauv lub cheeb tsam ntawm sorbitic steel hlau. Txawm li cas los xij, roj -quenched thiab tempered steel hlau tuaj yeem ua tiav qhov kev ua tau zoo dua li txias- kos steel hlau ntev npaum li nws tau quenched tag nrho. Nyob rau hauv tib lub zog tensile tej yam kev mob, martensitic steel hlau muaj ib tug siab elastic txwv tshaj txias{10}}tsim steel hlau. Lub microstructure ntawm txias- kos steel hlau yog fibrous thiab ho anisotropic, thaum lub microstructure ntawm roj-quenched thiab tempered steel hlau yog uniform tempered martensite thiab yuav luag isotropic. Nyob rau tib lub sijhawm, roj-quenched thiab tempered steel hlau muaj kev tiv thaiv zoo dua rau kev so zoo dua li txias- kos steel hlau, thiab nws qhov kub thiab txias (150{18}}190 degree) kuj siab dua qhov txias- kos steel hlau (tsawg dua lossis sib npaug li 120 degree). Loj - txoj kab uas hla - quenched thiab tempered steel hlau yog qhia ib tug muaj zog sib piv ntawm txias-draw steel hlau.
