Cov ntsiab lus
SA-213 T22yogtsis yog carbon steel. Qhov no yog ib qho kev tsis meej pem. Nws yog ibqis- hlau alloymuaj chromium thiab molybdenum. Nws tau teev nyob rau hauv ASME SA-213 tus qauv rau seamless ferritic thiab austenitic steel boiler, superheater, thiab tshav kub exchanger raj.
Nws qhov kev siv tseem ceeb yog nyob rau hauv siab - kub thiab siab - ntu siab ntawm boilers, xws li superheaters thiab reheaters, qhov twg nws txhim khu lub zog thiab tsis kam mus rau oxidation thiab creep tshaj cov carbon steels.
Cov yam ntxwv tseem ceeb
Khoom siv:Tsawg- hlau alloy (Chromium-Molybdenum)
Hom Lub Npe:T22, 2.25Cr-1Mo
Txheem:ASME SA-213 / ASTM A213 (lawv zoo tib yam)
Kev tsim khoom:Seamless
Chemical Composition (Qhov hnyav%)
Cov muaj pes tsawg leeg yog dab tsi txhais T22 thiab muab nws cov khoom.
| Lub ntsiab | Cov ntsiab lus (%) |
|---|---|
| Cov pa roj carbon (C) | 0.05 - 0.15 |
| Manganese (Mn) | 0.30 - 0.60 |
| Phosphorus (P) | 0.025 max |
| Sulfur (S) | 0.025 max |
| Silicon (Si) | 0.50 max |
| Chromium (Cr) | 1.90 - 2.60 |
| Molybdenum (hli) | 0.87 - 1.13 |
Vim li cas cov ntsiab lus no?
Chromium (Cr):Muab kev txhim kho tiv thaiv oxidation (scaling) thiab corrosion, tshwj xeeb tshaj yog los ntawm sulfur compounds thiab chav.
Molybdenum (hli)Ua kom muaj zog ntawm qhov kub siab thiab txhim kho kev tiv thaiv rau kev nkag mus (qeeb deformation nyob rau hauv qhov kev ntxhov siab tas li ntawm qhov kub siab).
Mechanical Properties
Tus qauv qhia qhov tsawg kawg nkaus uas yuav tsum tau muaj rau tensile thiab yield zog, nrog rau hardness.
| Khoom | Tus nqi |
|---|---|
| Tensile zog | 415 MPa (60 ksi) min |
| Yield zog | 205 MPa (30 ksi) min |
| Elongation | Varies with wall thickness, typically >30% |
| Hardness (Brinell) | 163 HBW max (rau normalized & tempered mob) |
Vim li cas T22 siv hauv Boilers? (Qhov zoo)
Zoo heev Creep Strength:Qhov laj thawj tseem ceeb rau nws siv. Nws tuaj yeem tiv taus lub siab loj sab hauv thiab qhov kub thiab txias (feem ntau txog ~ 1100℃F / 593 degree) nyob rau hauv cov khoom siv hluav taws xob thiab cov khoom siv reheater yam tsis muaj deforming dhau sijhawm.
Zoo Oxidation Resistance:Cov ntsiab lus chromium tsim cov txheej txheem oxide ruaj khov uas tiv thaiv cov hlau los ntawm kev sib txuas ntxiv hauv qhov chaw ncu thiab cov pa roj.
Zoo Weldability:Nws yog yooj yim weldable nrog cov txheej txheem tsim nyog thiab cov khoom siv hlau tsim nyog (xws li ER90S-B3, E9015-B3).
Microstructural Stability:Nws tuav nws lub zog thiab tsis yooj yim degrade nyob rau lub sijhawm ua haujlwm ntev ntawm qhov kub thiab txias.
Cov ntawv thov siv
Superheater Tubes
Reheater Tubes
Thaum tshav kub kub Exchanger Tubesnyob rau hauv siab - kub kev pab cuam
Boiler Phab Ntsa Tubeshauv siab- muaj peev xwm, siab - siab zog boilers
Kev sib piv nrog Carbon Steel (xws li, SA-210 A1)
Nws muaj txiaj ntsig zoo los piv T22 rau cov roj carbon steel boiler raj.
| Feature | SA -213 T22 (Low-Alloy) | SA-210 A1 (Carbon hlau) |
|---|---|---|
| Cov ntsiab lus tseem ceeb | 2.25% Cr, 1% Mo | Cov pa roj carbon, manganese |
| Max Service Temp | 1100 ° F (593 ° F) | 850 ° F (454 ° F) |
| Lub zog ntawm Temp | Siab(zoo creep zog) | Nruab nrab (tso siab dua 800℃F) |
| Oxidation Resistance | Zoo | Ncaj ncees |
| Nqi | Siab dua | qis |
| Kev siv yam | Superheaters, Reheaters | Dej phab ntsa raj, Economizers |
Kev kho cua sov thiab vuam
Kev kho cua sov:T22 tubes tau muab rau hauvNormalized thiab Temperedmob. Qhov kev kho cua sov no yog qhov tseem ceeb rau kev txhim kho qhov zoo microstructure rau siab - qhov kub thiab txias zog.
Vuam:Yuav tsum tau ua ntej- cua sov thiab tom qab-weld kev kho cua sov (PWHT) los tiv thaiv kev tsim cov tawv tawv, nkig martensitic zones nyob rau hauv tshav kub- cuam tshuam cheeb tsam (HAZ) thiab txo cov kev ntxhov siab seem. Kev siv cov hlau muab tub lim kom raug (xws li TIG qws ER90S-B3) yog qhov tseem ceeb.
Cov teeb meem muaj peev xwm
Stress Corrosion Cracking (SCC):Muaj peev xwm tshwm sim hauv qee qhov chaw yog tias qhov kev ntxhov siab seem tsis tau txo qis.
Graphitization:Tom qab ntev heev -lub sij hawm raug kub nyob rau hauv lub 800-1100℃F (427{5}}593 degree) ntau yam, carbon yuav precipitate tawm li graphite, tej zaum yuav tsis muaj zog cov khoom. Qhov no yog qhov paub zoo txog kev laus lub sijhawm ntev rau T22.
Hluav taws kub Corrosion:Muaj peev xwm raug tawm tsam los ntawm qis - melting - taw tes cov hmoov tshauv hauv qee qhov chaw roj.
Hauv cov ntsiab lus,SA-213 T22 yog cov hlau tsis tshua muaj hlau ua haujlwmtshwj xeeb tsim los rau qhov xav tau tshaj plaws, siab - qhov kub thiab txias ntawm cov boilers niaj hnub no, muab qhov sib npaug ntawm lub zog, nkag siab, thiab oxidation tsis kam uas carbon steel tsis tuaj yeem muab.
