Hlau yog ib hom hlau uas peb tau siv ntau dua tam sim no, vim nws lub zog siab, lub teeb yuag, zoo zuag qhia tag nrho, deformation muaj peev xwm, yog li nws yog qhov ntev rau kev tsim kho ntawm qhov loj-span thiab ultra-siab, ultra-heavy lub tsev. , thiab nws muaj cov yam ntxwv ntawm cov khoom tseem ceeb tshaj plaws nyob rau hauv txoj kab nrog cov kev xav ntawm kev siv tshuab engineering, cov khoom siv plasticity, toughness, tuaj yeem muaj qhov deformation loj, Nws tuaj yeem tiv taus qhov hnyav hnyav, lub sijhawm tsim kho yog luv, thiab nws cov degree ntawm industrialization. yog siab, thiab nws muaj peev xwm nqa tawm kev ntau lawm nrog ib tug high degree ntawm mechanization.
Cov qauv hlau yog cov qauv tsim los ntawm cov khoom siv hlau thiab yog ib qho ntawm cov qauv tsim lub tsev loj. Nws cov qauv yog tsim los ntawm cov kab hlau, steel kem, steel trusses thiab lwm yam khoom ua los ntawm seem steel thiab steel daim hlau, thiab welds, bolts los yog rivets feem ntau yog siv ntawm cov khoom thiab cov khoom. Vim nws lub teeb yuag thiab yooj yim siv, nws yog dav siv nyob rau hauv loj factories, venues, super high-rise thiab lwm yam teb.