Hlau phaj yog cov khoom siv hlau tiaj tiaj ua los ntawm cov hlau thiab tau siv dav hauv ntau qhov chaw, suav nrog kev tsim kho, tsim khoom, thiab kev thauj mus los. Nws lub luag haujlwm tseem ceeb suav nrog:
1. Cov qauv kev txhawb nqa: Siv rau hauv kev thauj khoom-cov kabmob xws li kab teeb, kab, thiab cov pob zeb hauv pem teb hauv cov tsev;
2. Kev Tiv Thaiv: Siv rau hauv kev tsim cov tsheb armored thiab cov khoom siv phom sij;
3. Kho kom zoo nkauj: Piv txwv li, xim -coated steel daim hlau yog siv rau lub tsev kho kom zoo nkauj phab ntsa;
4. Cov khoom siv tsim khoom: siv los tsim cov tshuab, tsheb, thiab nkoj;
5. Ntim: Piv txwv, steel nruas thiab ntim. Muaj ntau hom steel phaj, suav nrog kub- dov steel, txias- dov steel, galvanized steel, thiab xim-coated steel. Txhua hom yog tsim rau kev siv sib txawv raws li nws cov yam ntxwv thiab kev ua haujlwm. Piv txwv li, xim -coated steel phaj feem ntau yog siv rau lub ru tsev thiab phab ntsa vim tias lawv cov txheej txheej tsis yog tsuas yog ua kom zoo nkauj xwb tab sis kuj muaj kev tiv thaiv corrosion. Thaum xaiv cov phaj steel, yam xws li thickness, lub zog, thiab corrosion kuj yuav tsum tau txiav txim siab kom tau raws li qhov xav tau ntawm kev siv sib txawv.
