O aço preto yog cov khoom siv ntau yam, nrog rau ntau yam kev siv hauv ntu kev lag luam thiab hauv kev lag luam steel. Txhua xyoo, txhiab tons ntawm dub steel raj yog tsim. Thawj txoj kev tsim khoom tau pib thaum xyoo pua 19th thiab tau hloov zuj zus hauv ob xyoos dhau los, txhawm rau ua kom tau raws li cov phiaj xwm niaj hnub uas xav tau kev tiv thaiv thiab kev nyab xeeb.
Daim ntawv thov thiab kev ua haujlwm ntawm cov qauv yog nyob ntawm tus qauv uas cov raj no haum. Hom raj no tuaj yeem sewn los yog tsis, yog qhov tseem ceeb rau kev sib sau cov qauv ntawm cov squares, scaffolds, kev thauj mus los ntawm cov kua dej uas tsis muaj corrosive thiab combustible, kev teeb tsa hluav taws xob, thiab lwm yam haujlwm.
Cov khoom no feem ntau yog tsim los cuam tshuam nrog cov pa roj thiab propane thiab, yog li ntawd, yuav tsum ua raws li cov qauv kom ntseeg tau tias qhov ntsuas siab ntawm kwv yees li 150 psi (Pounds per Square Inch, hauv Portuguese: phaus ib square inch).
O aço preto tem multiplas utilities nyob rau hauv ntau haiv neeg segments thiab muaj peev xwm ua tau raws li qhov kev thov ntawm txhua sector raws li nws variation. Koj puas paub dab tsi yog qhov txiaj ntsig tseem ceeb thiab kev siv ntawm kev lag luam dub? Peb cais tag nrho cov ntaub ntawv ntawm cov khoom kom pov tseg koj cov kev tsis ntseeg, paub meej!
Los yog preto yog dab tsi?
Nyob rau hauv qhov tsaus ntuj ntawm cov hlau dub yog decoction ntawm cov hlau oxide uas tshwm sim thaum lub sij hawm tsim cov raj, thaum nws tsis tau coated nrog ib tug substrate xws li zinc los yog number case. Feem ntau, cov raj no tau koom nrog vuam lossis los ntawm cov khoom siv sib txuas. Tej zaum nws yuav los yog tsis yog galvanized, siv tau rau ntau qhov sib txawv.
Muaj nyob rau hauv ntau hom thiab ntau thiab tsawg, nws tsim nyog nyob rau hauv cov qauv zoo thiab kev nyab xeeb ntawm lub khw, xws li NBR 5590, NBR 5580, DIN 2440 thiab lwm yam.
Nws yog "mob aço" ntawm baixo grau. Qhov no txhais tau hais tias cov yeeb nkab dub muaj kev tiv thaiv corrosion thaum piv rau cov kav hlau cam khwb cia. Nws kuj yog heev resistant rau tshav kub.
Dab tsi yog daim ntawv thov ntawm lub raj dub?
Feem ntau yog siv cov khoom siv. Cov pa roj carbon dub lub raj tuaj yeem thauj cov pa roj thiab dej rau cov chaw nyob deb nroog thiab hauv nroog, rau cov kav dej uas tiv thaiv cov hluav taws xob sib txuas thiab uas muab cov pa thiab cua siab. Nws kuj tseem siv rau hauv kev lag luam roj los ua cov roj ntau ntau rau hauv cov chaw uas nyuaj rau kev nkag mus.
Hauv kev ua haujlwm ntawm nws qhov kev tiv thaiv siab rau cua sov, nws kuj yog siv los ntawm cov tuam txhab thiab cov chaw nyob los muab cov pa roj carbon monoxide lossis propane thiab hluav taws kub sprinklers. Cov xim dub no yog siv dav hauv kev faib roj hauv tsev thiab sab nraum tsev, qhov dej thiab cov kav dej phwj tuaj. Cov qauv yog ib hom hlau raj, dav siv los txuas cov khoom siv rau cov kab.
Dab tsi yog qhov txawv ntawm cov raj dub thiab galvanized steel raj?
Daim ntawv thov ntawm cov qauv nyob ntawm seb muaj pes tsawg leeg lossis tsis yog zinc txheej. Dub galvanized steel raj muaj cov oxide dub rau ntawm nws qhov chaw tom qab nws tau forged thiab coated nrog zinc zaj duab xis. Tsis tas li ntawd, nws muaj kev tiv thaiv zoo dua tiv thaiv corrosion thiab feem ntau yog siv rau hauv cov cua compressed, roj, dej thiab lwm yam dej.
