Tus kheej qhov ntswj ntsia hlau yog qhov cuab yeej siv tshuab, uas yog muaj kev xav tau. Feem ntau, bolts, screws, rivets, thiab lwm yam, txhawm rau kom muaj kev nyab xeeb lossis feem ntau tsis tas yuav xav txog cawv ntawm qhov kub, ib puag ncig tsis zoo lossis lwm yam kev ua haujlwm txaus ntshai. Cov khoom siv dav dav yog cov hlau tsis muaj steel, cov hlau tsis tshua muaj hlau thiab cov hlau tsis txhuam. Tab sis qee zaus, cov ntaub ntawv ceev nrawm yuav tsum ua kom tau raws li cov kev mob ntawm kev xeb lossis lub zog loj, muaj ntau cov hlau tsis muaj zog thiab ultra siab lub zog stainless hlau tawm. Rau qhov teeb meem nram qab no yuav tsum tau them sai sai rau thaum siv thiab tswj txoj hlua drilling xaim hlau:
1. Cov txheej txheem los yaug lub pob tw ciav hlau yog qhov ceev heev thiab yuav tsum tau ceev faj heev. Thaum lub sijhawm cov txheej txheem, yuav muaj cov seem nyob rau saum npoo ntawm qhov nqaim drilling hlau. Cov kauj ruam no yog kom yaug tom qab cov tshuaj ntxuav dej ntxuav silicate.
2. Thaum lub sijhawm hloov cov txheej txheem, cov pawg yuav tsum tau txiav ua ke, txwv tsis pub muaj oxidation me ntsis yuav tshwm sim hauv cov roj quenching.
3. Dawb phosphide seem yuav tshwm nyob rau saum npoo ntawm lub siab-lub zog screws, taw qhia (taw tes 1) tias kev tshuaj xyuas tsis ceev faj thaum lub sijhawm ua haujlwm. 4. Qhov teeb meem blackening nyob rau saum npoo ntawm cov khoom tsim cov tshuaj rov qab siv tshuaj, qhia tias qhov kev kho kub tsis tau ua kom huv si thiab cov alkaline seem nyob rau saum npoo tsis tau raug tshem tawm tag nrho.
5. Cov ntu txheem yuav xeb hauv qhov dej, thiab cov dej siv rau kev yaug yuav tsum hloov ntau zaus.
6. Ntau dhau ntawm kev xeb qhia tias cov roj quench tau siv ntev dhau lawm, thiab nws yuav tsum tau ntxiv lossis hloov ntxiv.