Lub ntsiab
Sa-213 T122is a specification for seamless ferritic and austenitic steel boiler, superheater, and heat-exchanger tubes. Nws txhais tau nyob rau hauvASTM A213 / ASME SA-213Txheem.
Lub "T122" yog hais txog kev siv tshuaj lom neeg muaj feem sib xyaw ua ke nyob ib puag ncig a12% chromium steel nrog tungsten ntxivCov. Qhov no alloy yog ib feem ntawm chav kawm ntawm qib siab siab- chromium steels paub txog qhov temperatures txog li 650℃(1200℃f).
1. Cov yam ntxwv tseem ceeb & vim li cas nws tau siv
T122 tau tsim los daws cov kev txwv ntawm qis-}} - sharcritical (USC) fais fab. Nws thawj qhov txiaj ntsig yog:
Siab Creity Lub Zog:Tuaj yeem tiv thaiv txhua yam kev ntxhov siab nyob rau hauv cov kub rau ncua sij hawm yam tsis muaj kev deormation tseem ceeb. Qhov no tso cai rau thinner raj raj phab ntsa, txhim kho kev ua kom kub hloov kev ua haujlwm.
Oxidation zoo ua tsis kam:Lub siab chromium cov ntsiab lus (nyob ib ncig ntawm 11%) cov ntaub ntawv ruaj khov, tiv thaiv chromium oxide txheej (tiv thaiv ntxiv corrosion los ntawm Chav thiab Flue Gases.
Zoo weldability:Thaum nws yuav tsum tau ua ntej - cua sov thiab tshaj tawm {}}}} chromium steels zoo li T91 / P91.
Kev ntxhov siab corrosion tawg tsis kam:Ua yeeb yam zoo nyob rau hauv ib cheeb tsam ua rau muaj kev ua tsis tiav no.
2. Tshuaj lom neeg sib xyaw (ib ASTM A213)
Cov muaj pes tsawg leeg tau nruj nreem kom ua tiav cov khoom xav tau. Cov ntsiab lus tseem ceeb suav nrog:
| Lub ntsiab | Muaj pes tsawg leeg (%) |
|---|---|
| Carbon (c) | 0.07 - 0.14 |
| Manganese (mn) | 0.70 max |
| Phosphorus (p) | 0.020 max |
| Sulphur (s) | 0.010 max |
| Silicon (si) | 0.50 max |
| Chromium (cr) | 10.00 - 12.50 |
| Molybdenum (mo) | 0.25 - 0.60 |
| Tungsten (w) | 1.50 - 2.50 |
| Vanadium (V) | 0.15 - 0.30 |
| Niobium (nb) | 0.04 - 0.10 |
| Nitrogen (n) | 0.040 - 0.100 |
| Boron (b) | 0.0005 - 0.0050 |
| Aluminium (AL) | 0.020 max |
| Npib tsib caug (ni) | 0.50 max |
Tseem ceeb alloying ntsiab thiab lawv lub luag haujlwm:
CR (chromium):Oxidation thiab corrosion tsis kam.
W (Tungsten) & Mo (Molybdenum):Cov tshuaj muaj zog ntxiv dag zog rau cov creep kuj.
V (Vanadium) & NB (Niobium):Daim ntawv nplua, cov carbides nyob ruaj khov thiab nitrides uas tus pines nplej sib cog lus thiab inhibit dislopation kev txav, zoo heev txhawb kev ua kom muaj zog.
B (Boron) & n (nitrogen):Txhim kho lub zog nkag thiab microstration stabilation.
3. Cov khoom siv kho tshuab (hauv qhov qub thiab tempered mob)
Cov hlab yuav tsum ua kom tau raws li cov kev xav tau hauv qab no:
| Ntiag tug | Qhov toob kas |
|---|---|
| Lub zog tensile | 620 mpa (90 Ksi) min |
| Paib lub zog | 440 MPA (64 KSI) MIN |
| Elongation | 20% min (ntawm tus qauv 50 hli gauge ntev) |
4. Cov Ntawv Thov Tib Neeg
Sa - Tshooj} 212 yog ib qho tshwj xeeb uas tau siv nyob rau hauv qhov tseem ceeb tshaj plaws thiab xav kom muaj kev kub siab ntawm:
Superheaters thiab reseatersin ultra-supercritical (USC) coal-fired power plants.
Cov Hluav Taws Xob Tshav Kub Kubnyob rau hauv kev xav tau kev lag luam.
Boiler Phab Ntsanyob rau hauv Advanced boiler tsim.
Txhua daim ntawv thov yuav tsum tau ntev - sij hawm pab ntawm hlau kub ntawm593 Qib rau 650℃(1100℃F rau 1200℃f).
5. Piv nrog cov qhab nia zoo sib xws
vs. T91 / P91:T122 muaj cov oxior oxidation tsis kam thiab siab dua lub zog ntawm qhov kub siab tshaj li 3065℃(1050℃f). T91 muaj kev lag luam ntau dua thiab siv nyob rau hauv cov nroj tsuag subcritical thiab supercritical, tab sis nws tau hloov los ntawm T122 nyob rau hauv lub hottest ntu ntawm Newer Uranc nroj tsuag.
vs. T92 / P92:T92 tseem muaj tungsten thiab boron thiab yog qhov zoo heev hauv kev ua haujlwm rau T122. Lub ntsiab sib txawv yog cov ntsiab lus chromium (T92 muaj ~ 9% CR, T122 muaj ~ 12% CR). Cov CRE hauv T122 muab nws qhov sib txawv hauvChav oxidation tsis kam.
Vs. T11 (1.25Cro):T122 yog ib qho zoo tshaj plaws alloy nyob rau hauv txhua nam rau high-} kub kev pab. T11 yog siv rau qis - kub seem.
6. Kev qhia thiab cov kev txiav txim siab vuam
Ua haujlwm nrog T122 yuav tsum tau saib xyuas tshwj xeeb:
Pre - cua sov:Yuav tsum ua kom tiv thaiv kev tawg txias.
Post - Weld Kev Kho Tshav Kub (PWHT):Kiag li tseem ceeb. Ib qho kev kub siab tshwj xeeb (feem ntau ~ 760℃/ 1400℃f) yog qhov yuav tsum tau rov ua kom sov micte {}}} be} cuam tshuam cheeb tsam (Haz).
Muab Tub Hlau:Vuam yuav tsum tau ua nrog txuam los yog tshaj {{{}} Matching muaj cov hlau (piv txwv li} b9 co vuam).
Tswjhwm Zoo:Tsis - Nyiam Kev Kuaj (NDT) Zoo li Ultrasonic Testing (ut) lossis tshuaj ntsuam tam sim no tau teev tseg rau Weld kev ncaj ncees.
Lub ntsiab
SA-213 T122 Seamless Steel Yeeb NkabYog tus hwm, siab -} Kev ua tiav alloy tsim rau cov mob tshaj plaws hauv kev muaj zog tam sim no. Nws cov chemical fab uas muaj tseeb, tshwj xeeb tshaj yog 12% thiab cov khoom siv tsis zoo, ua rau nws cov pa hluav taws xob siab thiab txo cov pa roj hmab ntawm cov hluav taws xob ntau.
