Cold-cov raj yog siab- cov raj hlau ua tiav los ntawm cov txheej txheem txias - kos duab thiab siv dav hauv kev tsim khoom, kev lag luam tsheb, kev lag luam petrochemical, thiab lwm yam. Lawv qhov zoo ntawm qhov raug thiab qhov zoo ntawm qhov ua rau lawv yog qhov kev xaiv zoo tshaj plaws rau ntau daim ntawv thov. Kev ua tau zoo ntawm cov khaub thuas- cov raj tau kos yog nyob ntawm lawv cov khoom siv, uas txiav txim siab lub raj lub zog, tiv thaiv corrosion, hnav tsis kam, thiab kev ua haujlwm.
Cov ntaub ntawv tseem ceeb uas siv rau txias - cov raj muaj xws li carbon structural steel, alloy structural steel, thiab stainless hlau. Cov pa roj carbon monoxide steel, xws li No. 10 thiab Tsis yog . 20 steels, yog cov khoom siv tshaj plaws rau cov raj txias -cov raj. Nws muaj cov yas zoo thiab weldability thiab tsim nyog rau cov ntawv thov uas tsis muaj zog, xws li cov khoom siv tshuab thiab cov kav dej hydraulic. Cov khoom no yog tus nqi qis - tus nqi thiab muaj kev ua tau zoo, ua rau nws siv dav hauv kev lag luam kev lag luam.
Alloy structural steels, xws li 40Cr thiab 20CrMnTi, yog lwm yam khoom tseem ceeb rau cov khaub thuas -cov hlab. Qhov sib ntxiv ntawm cov hlau alloying xws li chromium, manganese, thiab titanium ua rau lub raj muaj zog, hnav tsis kam, thiab tshav kub- kho tau. Cov khoom siv no feem ntau yog siv rau hauv kev tsim cov khoom siv siab -load, siab- cov khoom siv kho tshuab precision xws li lub tes tsho thiab lub zog, ua tau raws li qhov yuav tsum tau muaj zog thiab hnav tsis kam.
Stainless hlau txias-cov raj tau muaj npe nrov rau lawv cov kev tiv thaiv corrosion zoo heev. Feem ntau siv yog austenitic stainless hlau xws li 304 thiab 316. Cov ntaub ntawv no tau siv dav hauv kev lag luam tshuaj, khoom noj khoom haus, thiab cov cuab yeej siv kho mob, ua kom muaj kev tiv thaiv zoo heev thiab kev tu cev hauv cov cheeb tsam hnyav. Tsis tas li ntawd, martensitic stainless hlau xws li 2Cr13 feem ntau siv rau hauv daim ntawv thov uas yuav tsum tau muaj zog thiab corrosion kuj.
Hauv cov ntsiab lus, kev xaiv cov khoom siv rau txias - cov raj yog nyob ntawm cov ntawv thov tshwj xeeb. Cov pa roj carbon steel yog tsim rau kev siv dav dav, hlau alloy rau siab - lub zog yuav tsum tau muaj, thiab cov hlau tsis muaj steel rau qhov chaw corrosive. Kev xaiv cov khoom tsim nyog tuaj yeem ua kom muaj txiaj ntsig zoo ntawm kev ua haujlwm txias -cov raj thiab ua tau raws li cov kev cai nruj ntawm ntau yam kev lag luam.
