Feem ntau, cov ntsiab lus carbon hauv cov hlau ntshiab yog tsawg dua 0.002%, uas ua rau nws txawv ntawm lwm hom hlau xws li hlau. Hlau tuaj yeem txhim kho nrog ntau qhov sib txawv ntawm cov pa roj carbon thiab lwm yam khoom siv los txhim kho nws cov kev ua tau zoo.
Cov hlau ntshiab, tseem hu ua high-purity hlau thiab ultra-low carbon steel, kuj yog mos thiab ductile vim nws cov ntsiab lus carbon tsawg. Qhov no ua rau nws tsim nyog rau cov ntawv thov uas xav tau kev ua haujlwm siab thiab yoog raws. Txawm li cas los xij, piv rau cov hlau, nws qhov hardness qis dua thiab lub zog txwv nws txoj kev siv hauv cov qauv thiab cov khoom siv thauj khoom.
Zuag qhia tag nrho, cov yam ntxwv ntawm cov hlau ntshiab yog nws cov ntsiab lus qis tshaj plaws, uas ua rau nws lub cev thiab cov khoom siv kho tshuab, ua rau nws tsim nyog rau cov ntawv thov tshwj xeeb nrog kev yooj yim thiab ductility.