Cov lus piav qhia luv luv:

Kub-nias nrog cov roj nplaum zoo thiab cov ntxaij
Khoom nta: cov khoom lag luam zoo ruaj khov, qhov tseeb tsis hlawv cov haujlwm, tsis tshua khov, zoo dua cov khoom puas, muaj zog thiab tsis yooj yim poob tawm ，
thiab nws muaj cov yam ntxwv ntawm tensile, cuam tshuam thiab khoov lub zog.
Cov khoom lag luam feem ntau haum rau: cov hlau zoo tib yam (lub kaum sab xis steel, square steel, tiaj tus hlau, rebar, hlau yeeb, thiab lwm yam), cov hlau loj, siab hardness steel, stainless hlau, tuag steel, hlau loj, thiab lwm yam.