Tshwj xeeb - Daim tawv hlau yog lub sij hawm shrothand rau cov khoom siv hlau ua kom zoo nkauj. Nws yog hom ntawm seem steel thiab yog txawv los ntawm seem yooj yim steel ntu. Nyob ntawm cov txheej txheem ntau lawm, nws tuaj yeem raug faib ua kub {polled, txias}- tsim, thiab welded. Tshwj xeeb {{{{}} Cov hlau zoo li yog hais txog kub - rolled steel. Kub - rolled steel yog lo lus uas ua rau qhov txawv square steel, hloov hlau, thiab lwm yam siv cov duab.
