Alloy cov hlau muaj sib txawv ntawm cov khoom siv aloyy, siliab, tooj, tooj, lub zog, weldability, weldability, lossis ducility. Qhov sib txawv yog cov khaub ncaws txawv me ntsis, tab sis rau cov hom phiaj ntawm qhov txawv, tag nrho cov hlau sib tw tshaj 8% los ntawm qhov hnyav, tsis yog carbon thiab alloys, yog suav tias yog cov hlau loj. Alloy hlau yog qhov nyuaj, ntau ruaj khov, thiab ntau tus tiv taus corrosion. Alloy Steels nrog mob pes tsawg rau cov ntsiab lus carbon siab yog qhov nyuaj rau Weld. Txawm li cas los xij, yog cov ntsiab lus carbon yog txo qis rau 1% rau 3%, cov hlau alloy no tuaj yeem ua tiav cov khoom lag luam siab dua thiab weldability, yog li nce lub zog.