Txheej txheem cej luam: A335 P1 yog dab tsi?
ASTM A335 Cov Lus Qhia Tshwj Xeebyog Standard Specification rauSeamless Ferritic Alloy-Steel Yeeb Nkab rau Siab-Tsev Kev Pabcuam.
Qhov "P1" qhia txog qib tshwj xeeb hauv tus qauv ntawd. A335 P1 yeeb nkab yog aseamless, carbon-molybdenum (C-Mo) alloy steel yeeb nkabtsim los tiv thaiv kev kub ntxhov thiab kub.
Nws yog feem ntau siv raumuaj zog boilers, industrial boilers, thiab txheej txheem pipingcov tshuab uas kub tshaj qhov haum rau cov pa roj carbon steel (xws li A106 B).
Cov yam ntxwv tseem ceeb ntawm A335 P1
1. Tshuaj muaj pes tsawg leeg
Qib "P1" yog txhais los ntawm nws cov tshuaj pleev ib ce, uas ua rau nws siab - qhov kub thiab txias.
| Lub ntsiab | Kev sib xyaw (%) |
|---|---|
| Cov pa roj carbon (C) | 0.10 - 0.20 |
| Manganese (Mn) | 0.30 - 0.80 |
| Phosphorus (P) | 0.025 max |
| Sulfur (S) | 0.025 max |
| Silicon (Si) | 0.10 - 0.50 |
| Molybdenum (hli) | 0.44 - 0.65 |
Vim li cas nws tseem ceeb:Qhov tseem ceeb alloying ntsiab yogMolybdenum. Qhov sib ntxiv ntawm Mo ua kom muaj zog ntawm cov hlau ntawm qhov kub thiab txias thiab txhim kho kev tiv thaiv kom nkag tau (slow deformation nyob rau hauv qhov kev ntxhov siab tas li ntawm qhov kub thiab txias).
2. Mechanical Properties
Cov yeeb nkab yuav tsum ua kom tau raws li cov khoom siv kho tshuab yam tsawg kawg nkaus tom qab kev kho cua sov.
| Khoom | Tus nqi |
|---|---|
| Tensile zog | 380 MPa (55,000 psi) min |
| Yield zog | 205 MPa (30,000 psi) min |
| Elongation | Nws txawv nrog phab ntsa thickness, tab sis feem ntau yog tsawg kawg yog 22-30% |
3. Kev kho cua sov
A335 P1 Pipe yogib txwm muab nyob rau hauv lub normalized los yog normalized thiab temperedmob. Qhov kev kho cua sov no yog qhov tseem ceeb rau kev tsim cov khoom tsim nyog microstructural uas muab lub zog thiab toughness ntawm qhov kub thiab txias.
4. Cov txheej txheem tsim khoom
Lub specification mandates hais tias cov yeeb nkab yuavseamless. Qhov no txhais tau hais tias nws yog tsim los ntawm ib tug khoom billet yam tsis muaj welded seams, ua rau nws inherently muaj zog thiab ntau txhim khu kev qha rau siab - kev siv siab.
Cov ntawv thov siv
A335 P1 yog siv nyob rau hauv seem ntawm lub boiler los yog piping system qhov twg qhov kev pab cuam kub yog feem ntau nyob rau hauv ntau yam.800 ° F txog 1000 ° F (425 ° txog 540 ° F). Common siv muaj xws li:
Superheater Tubes:Qhov twg chav yog rhuab tshaj nws saturation kub.
Reheater Tubes:Qhov twg cov pa los ntawm lub siab - siab turbine raug xa rov qab mus rau lub boiler kom reheated ua ntej nkag mus rau qis dua - siab turbine.
High -Tsub Cov Kav Dej:Cov kab hluav taws xob tseem ceeb thiab cov kab kub reheat hauv cov chaw fais fab.
Txheej Txheem Piping:Hauv refineries thiab tshuaj nroj tsuag rau nqa cov txheej txheem kub.
Kev sib piv nrog Lwm Cov Qib Pipes
Nws pab tau kom pom tias A335 P1 piv rau lwm yam zoo sib xws - saib cov lus qhia tshwj xeeb.
| Specification | Qib | Lub Npe | Ntsiab Feature | Hom Siv Case |
|---|---|---|---|---|
| ASTM A335 Cov Lus Qhia Tshwj Xeeb | P1 | C-Mo | Molybdenum alloy rau nruab nrab -siab temp | Superheaters, Reheaters (~ 800-1000℃F) |
| ASTM A106 1 | B | Carbon Steel | General hom phiaj carbon steel | Boiler tubes, kev pabcuam dav dav (<800°F) |
| ASTM A335 Cov Lus Qhia Tshwj Xeeb | P11 | 1.25Cr-0.5Mo | Tsawg Chromium ntxiv | Siab kub / siab tshaj P1, ntau corrosion resistant |
| ASTM A335 Cov Lus Qhia Tshwj Xeeb | P22 | 2.25Cr-1Mo | Chromium{0}}Molybdenum | Muaj ntau heev rau siab -siab headers thiab piping |
| ASTM A335 Cov Lus Qhia Tshwj Xeeb | P91 | 9Cr-1Mo-V | High Chromium, qib siab alloy | Niaj hnub nimno siab -cov nroj tsuag ua tau zoo (siab kub / siab) |
Hauv cov ntsiab lus yooj yim:Thaum cov pa roj carbon steel (A106) tsis muaj zog txaus rau qhov kub thiab txias, koj nce mus rau cov hlau alloy zoo liA335 P1. Yog tias koj xav tau qhov kub thiab txias dua los yog kev tiv thaiv corrosion, koj yuav siv chrome-moly steel zoo li P11 lossis P22.
Cov ntsiab lus tseem ceeb rau kev siv
Vuam:A335 P1 xav tau cov txheej txheem vuam tshwj xeeb thiab cov khoom siv hlau (xws li ER80S-B2, E8018-B2) uas phim nws cov tshuaj muaj pes tsawg leeg. Ua ntej{11}}kev kho cua sov thiab tom qab vuam cua sov (PWHT) feem ntau yuav tsum tau ua kom tsis txhob tawg thiab txo kev ntxhov siab.
Codes thiab Standards:Nws siv yog tswj hwm los ntawm cov hlab ntsha loj thiab cov kav dej xws li ASME Boiler thiab Pressure Vessel Code (BPVC), Tshooj I (Lub Zog Boilers).
Kev txheeb xyuas:Cov kav dej tau cim nrog cov lus qhia tshwj xeeb (A335), qib (P1), tus lej xov tooj cua sov, lub npe tsim khoom, thiab qhov loj me rau kev taug qab tag nrho.
Cov ntsiab lus
A335 P1yog aseamless, carbon{0}}molybdenum alloy steel yeeb nkabtsim tshwj xeeb rausiab - kub thiab siab - kev pabcuam siabhauv kev tsim hluav taws xob thiab cov txheej txheem kev lag luam. Nws qhov txiaj ntsig tseem ceeb tshaj carbon steel yog qhovcov ntsiab lus molybdenum, uas muab lub zog zoo dua thiab nkag siab ua haujlwm ntawm kev ua haujlwm kub feem ntau ntawm 800℃F thiab 1000℃F.
