20Mn2, 40Mn2, thiab 50Mn2 yog tag nrho cov hlau tsis tshua muaj hlau uas muaj ntau yam sib txawv thiab cov khoom.
Cov hlau phaj no feem ntau siv rau hauv kev tsim khoom ntawm ntau yam khoom siv thiab cov khoom siv uas xav tau lub zog siab, toughness, thiab hnav tsis kam. Cov ntsiab lus tshwj xeeb ntawm cov hlau phaj, xws li qhov ntev, qhov siab, thiab qhov chaw tiav, tuaj yeem tau txais los ntawm cov chaw muag khoom steel lossis cov chaw tsim khoom raws li koj cov kev xav tau tshwj xeeb.