ASTM A335 Tube yog dab tsi?
ASTM A335 yog tus qauv tshwj xeeb rau seamless ferritic alloy steel yeeb nkab rau siab -kev pabcuam kub. Cov yeeb nkab yog tsim los ntawm chromium-molybdenum thiab lwm yam hlau alloys uas tuav lub zog thiab tiv thaiv oxidation thiab nkag mus rau qhov kub siab qhov twg carbon hlau yuav ua tsis tiav. Tus qauv npog cov qib los ntawm P1 txog P92, thiab qib kev xaiv qhia txog cov tsev neeg hlau thiab cov nominal muaj pes tsawg leeg. A335 yeeb nkab yog lub caj qaum ntawm siab - qhov kub thiab txias ntawm cov kav dej hauv cov chaw tsim hluav taws xob thiab cov chaw tsim khoom.
Cov Qib thiab Cov Txheej Txheem
| Qib | Chromium | Molybdenum | Lwm Yam Khoom |
|---|---|---|---|
| P1 | Tsis tau teev tseg | 0.44% rau 0.65% | Cov pa roj carbon monoxide 0.10% - 0.20% |
| P5 | 4.00% rau 6.00% | 0.44% rau 0.65% | Carbon 0.15% siab tshaj |
| P9 | 8.00% rau 10.00% | 0.44% rau 0.65% | Silicon 0.50% rau 1.00% |
| P11 | 1.00% txog 1.50% | 0.44% rau 0.65% | Cov pa roj carbon monoxide 0.05% - 0.15% |
| P22 | 1.90% rau 2.60% | 0.87% rau 1.13% | Cov pa roj carbon monoxide 0.05% - 0.15% |
| P91 | 8.00% rau 9.50% | 0.85% rau 1.05% | Vanadium, niobium, nitrogen |
Mechanical Properties
Tag nrho cov qib A335 raug txheeb xyuas los ntawm kev ntsuas tensile, nrog qhov tsawg kawg nkaus tawm los thiab tensile qhov tseem ceeb tau teev tseg rau ib qib thiab phab ntsa tuab. Piv txwv li, P11 muaj qhov tsawg kawg nkaus lub zog ntawm 30 ksi, sib npaug rau 205 MPa, thiab lub zog tensile yam tsawg kawg nkaus ntawm 60 ksi, sib npaug rau 415 MPa. P91, siab -lub zog 9Cr-1Mo-V qib, muaj qhov tsawg kawg nkaus tawm los ntawm 60 ksi, sib npaug rau 415 MPa, thiab qhov tensile yam tsawg kawg nkaus ntawm 90 ksi, sib npaug rau 620 MPa, uas tso cai rau cov phab ntsa nyias nyias hauv cov kev pabcuam siab.
Kev kho cua sov thiab kev xa khoom
Kev kho cua sov sib txawv raws qib. Tsawg- cov qib alloy xws li P11 thiab P22 feem ntau xa tuaj rau hauv cov txheej txheem annealed lossis normalized thiab tempered, thaum P91 yog ib txwm normalized thiab tempered los tsim nws cov qauv martensitic. Kev kho cua sov yog qhov tseem ceeb rau kev nkag siab lub zog ntawm qib, thiab cov ntsiab lus tau sau rau ntawm daim ntawv pov thawj zeb. Flattening, dabtsi yog khoov, thiab hydrostatic tests ua kom tiav qhov tseeb ntawm txhua cov yeeb nkab.
Qhov Loj
A335 yeeb nkab yog muaj nyob rau hauv seamless khoom ntawm li 6 hli mus rau 900 hli sab nraud txoj kab uas hla, nrog phab ntsa thicknesses li ntawm 1 hli mus rau 100 hli. Standard ntev ntev yog 6 m mus rau 12 m, thiab cov yeeb nkab yog muab nyob rau hauv random los yog tsau lengths ib qhov kev txiav txim. Teem caij los ntawm Teem caij 10 txog Teem caij 160 thiab hnyav dua yog tsim.
Tej kev siv
A335 yeeb nkab yog siv rau superheater thiab reheater raj, cov kav dej tseem ceeb, cov kab kub reheat, thiab boiler sab nraud piping nyob rau hauv fais fab nroj tsuag. Refineries siv nws rau hydroprocessing, catalytic hloov kho, thiab lwm yam siab -kub txheej txheem piping, thiab petrochemical nroj tsuag qhia nws rau ethylene thiab hydrogen kev pab cuam. Cov qib chromium siab dua tiv thaiv oxidation thiab corrosion hauv cov kev pabcuam hnyav tshaj plaws.
FAQ
Qhov txawv ntawm A335 P11 thiab P22 yog dab tsi?
P11 muaj li ntawm 1.25 feem pua chromium thiab 0.5 feem pua molybdenum, thaum P22 muaj li ntawm 2.25 feem pua chromium thiab 1 feem pua molybdenum. P22 muaj qhov siab dua - qhov kub thiab txias thiab siv rau tuab dua - phab ntsa, siab dua - kev pabcuam siab.
P91 yeeb nkab siv rau dab tsi?
P91 yog 9Cr-1Mo-V qib siv rau lub ntsiab chav thiab kub reheat kab hauv supercritical fais fab nroj tsuag. Nws lub zog creep siab tso cai rau cov phab ntsa nyias thiab cov lus teb sai dua li P22.
Puas yog A335 yeeb nkab seamless nkaus xwb?
Yog lawm. A335 npog seamless yeeb nkab nkaus xwb. Rau welded alloy yeeb nkab nyob rau hauv siab - qhov kev pab kub, ASTM A691 yog siv.
A335 yeeb nkab puas tuaj yeem welded?
Yog lawm, tab sis cov qib alloy siab dua yuav tsum tau ua tib zoo saib xyuas cov txheej txheem tsim nyog, preheat, thiab tom qab -weld heat treatment. Vuam yog ua nrog kev sib piv lossis overmatching consumables thiab nruj interpass kub tswj.
Qhov kev pabcuam siab tshaj plaws rau A335 yog dab tsi?
Qhov txwv nyob ntawm qib. P11 thiab P22 feem ntau siv txog li 590 degrees Celsius, thaum P91 txuas mus txog 650 degrees Celsius hauv cov qauv boiler niaj hnub.
Cov ntawv pov thawj twg muab?
Cov ntawv pov thawj zeb xeem sau cov tshuaj muaj pes tsawg leeg, tensile zog, kho cua sov, kuaj hydrostatic, thiab lwm yam kev ntsuam xyuas ntxiv uas yuav tsum tau ua los ntawm kev txiav txim.
