1. Q: Piav qhov tseem ceeb ntawm Carbon Equivalent (CE) tus nqi rau cov qib weldable zoo li X70.
A:CE (piv txwv li, Pcm, IIW mis) yog tus nqi xam los ntawm cov hlau cov tshuaj muaj pes tsawg leeg uas kwv yees lub hardness thiab kev pheej hmoo ntawm txias tawg hauv tshav kub- cuam tshuam cheeb tsam (HAZ) tom qab vuam. Rau siab -qib kab kav, CE qis yog qhov tseem ceeb los xyuas kom meej weldability yam tsis muaj qhov dav ua ntej- cua sov, tso cai rau kev ua haujlwm vuam zoo, tshwj xeeb tshaj yog nyob rau hauv cov haujlwm vuam siv hluav taws xob.
2. Q: Dab tsi yog "Clad Pipe" lossis "Mechanically Lined Pipe" (MLP), thiab nws siv thaum twg?
A:Nws yog cov yeeb nkab uas muaj cov pa roj carbon steel (xws li API 5L X65) txheej txheej txheej rau cov txheej txheem muaj zog thiab cov txheej txheej nyias nyias (xws li, 316L stainless hlau, Alloy 625) rau corrosion kuj. Nws yog siv los thauj cov kua dej uas muaj corrosive heev (xws li, CO₂ ntub dej, acidic multiphase flow) qhov twg cov khoom muaj corrosion{11}}cov yeeb nkab uas tsis muaj zog yuav raug txwv tsis pub kim.
3. Q: Thaum twg ASTM A335 P11 yeeb nkab tau teev tseg?
A:A335 P11 (1.25Cr-0.5Mo-Si) yog siv rau cov kav dej kub kub (piv txwv li, cov kav dej, cov kab rov ua dua tshiab) thiab cov kav dej refinery qhov kub ntawm 450℃txog 550℃(842℃F txog 1022℃F). Nws muaj kev nkag siab zoo dua li cov pa roj carbon steel tab sis yog tus nqi qis dua cov qib siab alloy.
4. Q: Dab tsi yog qhov zoo ntawm ASTM A335 P22 tshaj P11?
A:P22 (2.25Cr-1Mo) muaj ntau dua chromium thiab molybdenum cov ntsiab lus, muab superior oxidation tsis kam, siab creep zog, thiab zoo microstructural stability ntawm kub txog li 580℃(1076℃F). Nws yog cov khoom siv ua haujlwm rau siab - qhov kub thiab txias, siab siab headers thiab chav kab.
5. Q: Vim li cas ASTM A335 P91 yog qib kev hloov pauv rau cov tshuab hluav taws xob fossil?
A:P91 (9Cr-1Mo-V) yog lub zog creep zog enhanced ferritic (CSEF) steel. Nws ntxiv ntawm vanadium, niobium, thiab nitrogen, nrog rau kev kho cua sov tshwj xeeb, muab nws lub zog creep piv rau austenitic stainless hlau (xws li 304H) ntawm qhov kub ntawm 600 degree, tab sis nrog thermal conductivity zoo dua thiab qis thermal expansion, txo thermal qaug zog.
