Ib qho yooj yim txiav hlau deforms vim nws softness thaum ua hauj lwm, thiab nws sab ntev yuav mos, uas cuam tshuam rau qhov tseeb thiab ceev ntawm cov txheej txheem txiav.Cov hlau-chromium-aluminium hlau yog tawv, tab sis nkig thiab yooj yim tawg.German thawj txiav hlau yuav tsis ua mos, yuav tsis deform ntawm qhov kub thiab txias, thiab ruaj khov.Nws yog qhov zoo tshaj plaws kub txiav hlau.
Cov hlau txiav tuaj los ntawm lub teb chaws Yelemees muaj qhov zoo oxidation tsis kam thiab kub siab zog.Lub zog tensile siab tshaj plaws ntawm cov khoom siv hluav taws xob zoo tib yam yog 780, thiab cov hlau txiav tuaj yeem ncav cuag 1800, uas muaj kev ua haujlwm zoo.Qhov kev txiav zoo tshaj plaws tuaj yeem ua tiav los ntawm kev kho qhov kub thiab txiav ceev, thiab hom thiab qhov ceev ntawm cov khoom yuav cuam tshuam rau kev txiav ceev.