Cov khoom siv niaj hnub ua lub luag haujlwm tseem ceeb hauv kev tsim cov hlau, txawm tias nws yog cov hlau tsis muaj steel siv hauv cov khoom siv kho mob lossis cov nqaij nruab deg, ib tiam dhau los ntawm cov hlau ua haujlwm siab tau tsim nyob rau ob peb lub xyoo dhau los rau kev lag luam tsheb, lossis cov hlau xws li txhuas thiab titanium.uas muaj lub zog loj rau qhov hnyav piv thiab siab corrosion kuj ua rau nws tshwj xeeb tshaj yog haum rau kev siv hauv aerospace, roj refining thiab tshuaj industries.
Tib yam siv rau qee cov pa roj carbon steel alloys, tshwj xeeb tshaj yog alloys nrog qee cov ntsiab lus carbon thiab manganese.Nyob ntawm seb tus nqi ntawm cov khoom siv alloying, qee qhov ntawm lawv zoo haum rau kev tsim khoomflanges, fittingsthiabcov kav dejNyob rau hauv cov tshuaj thiab cov roj refineries.Lawv txhua tus muaj ib yam zoo sib xws: cov ntaub ntawv siv nyob rau hauv cov ntaub ntawv no yuav tsum ductile txaus los tiv thaiv brittle puas thiab kev nyuaj siab corrosion cracking (SCC).
Cov koom haum Standards xws li American Society of Manufacturing Engineers (ASME) thiab ASTM Intl.(yav tas los hu ua American Society for Testing and Materials) muab kev taw qhia txog qhov no.Ob txoj kev lag luam muaj feem cuam tshuam-ASME Boiler muajthiab Pressure Vessel (BPVD) Tshooj VIII, Tshooj 1, thiab ASME B31.3, Txheej Txheem Piping - chaw nyob carbon steel (txhua yam uas muaj 0.29% txog 0.54% carbon thiab 0.60% mus rau 1.65% manganese, hlau muaj cov ntaub ntawv).saj zawg zog txaus siv nyob rau hauv cov huab cua kub, temperate cheeb tsam thiab kub li tsawg li -20 degrees Fahrenheit.Txawm li cas los xij, kev poob qis tsis ntev los no ntawm qhov kub thiab txias tau ua rau muaj kev soj ntsuam ze dua ntawm cov nyiaj thiab qhov sib npaug ntawm ntau yam microalloying ntsiab siv hauv kev tsim cov flanges, fittings thiab fittings. api steel kav.
Txog thaum tsis ntev los no, tsis yog ASME lossis ASTM yuav tsum tau kuaj xyuas kom paub meej tias qhov ductility ntawm ntau cov khoom siv carbon steel siv nyob rau hauv qhov kub thiab txias li -20 degrees Fahrenheit.Kev txiav txim siab tsis suav nrog qee yam khoom yog ua raws li keeb kwm ntawm cov khoom siv.Piv txwv li, thaum qhov tsawg kawg nkaus hlau tsim qhov kub thiab txias (MDMT) yog -20 degrees Fahrenheit, nws raug zam los ntawm kev ntsuam xyuas cuam tshuam vim nws txoj haujlwm ib txwm siv hauv cov ntawv thov.
Post lub sij hawm: Apr-19-2023