Txheej txheem cej luam
SA-209 T1ayog ib qho specification rau seamless carbon-molybdenum alloy-steel boiler thiab superheater raj, txhais los ntawm covASME (American Society of Mechanical Engineers)Boiler thiab Pressure Vessel Code, Tshooj II, Ntu A.
Nws yog cov khoom siv tseem ceeb uas siv rau hauv kev siv siab -kub siab, tshwj xeeb tshaj yog nyob rau hauv kev lag luam fossil roj fais fab.
Cov yam ntxwv tseem ceeb
Alloy Composition:Lub npe "T1" txhais tau tias nws lub ntsiab alloying yogMolybdenum (hli). Qhov "a" hauv T1a qhia txog cov tshuaj muaj pes tsawg leeg hauv T1 tsev neeg.
Siab -Tsub Muaj Zog:Qhov sib ntxiv ntawm Molybdenum (feem ntau 0.44-0.65%) ua rau muaj zog tensile thiab creep zog ntawm qhov kub thiab txias piv rau cov pa roj carbon steel xws li SA-210.
Weldability thiab Formability:Nws muaj qhov zoo weldability thiab tuaj yeem khoov thiab tsim, txawm hais tias nws yuav tsum tau saib xyuas ntau dua li carbon steel vim nws cov xwm txheej alloy.
Daim ntawv thov:Tsim los siv rau hauv siab - qhov chaw siab uas qhov kub tuaj yeem tshaj qhov haum rau cov hlau.
Tshuaj muaj pes tsawg leeg (ASTM A209 / A209M)
Cov tshuaj muaj pes tsawg leeg yog qhov tseem ceeb ntawm qhov txawv ntawm T1a los ntawm lwm qib.
| Lub ntsiab | Kev sib xyaw (%) |
|---|---|
| Cov pa roj carbon (C) | 0.15 - 0.25 |
| 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 |
Lus Cim: Cov ntsiab lus siab Molybdenum yog qhov tseem ceeb.
Mechanical Properties (ASTM A209 / A209M)
Cov khoom yog muab rau cov hlab hauv qhov normalized los yog normalized thiab tempered kub- kho mob.
| Khoom | Tus nqi |
|---|---|
| Tensile zog | 415 MPa (60,000 psi) min |
| Yield zog | 255 MPa (37,000 psi) min |
| Elongation | 30% min (hauv 2 nti), 22% min (hauv 50mm) |
Cov ntawv thov siv
SA-209 T1a kav yog siv nyob rau hauv cov khoom raug rau siab thiab kub, xws li:
Superheater Tubes:Thawj daim ntawv thov. Cov hlab no raug rau qhov kub siab tshaj plaws hauv lub boiler.
Reheater Tubes
Boiler Tubeshauv siab - ntu siab
Thaum tshav kub kub Exchangershauv kev xav tau kev pabcuam
Cov nkoj siabrau siab -kev pabcuam kub
Qhov zoo tshaj Carbon Steel (xws li SA-210 A/C)
Siab zog ntawm qhov kub thiab txias:Muaj peev xwm tiv taus tib lub siab nrog cov phab ntsa nyias nyias ntawm qhov kub thiab txias, txhim kho kev hloov hluav taws xob.
Txhim kho Creep Resistance:Resistant deformation nyob rau hauv qhov kev ntxhov siab tas li ntawm qhov kub thiab txias rau lub sijhawm ntev.
Zoo dua Microstructural Stability:Cov molybdenum pab tiv thaiv graphitization thiab lwm yam kev hloov pauv microstructural thaum lub sijhawm.
Sib piv nrog Lwm Qib
| Qib | Ntsiab Feature | Hom Siv Case |
|---|---|---|
| SA-209 T1a | C-Mo Steel | Superheaters, siab -kub boiler seem |
| SA-210 A1/C | Carbon Steel | Cov kav dej phab ntsa, qis dua -kub boiler seem |
| SA-213 T11 | 1.25Cr-0.5Mo Hlau | Siab kub & corrosion tsis kam tshaj T1a |
| SA-213 T22 | 2.25Cr-1Mo Hlau | Txawm tias kub dua thiab oxidation kuj |
Vim li cas thiaj xaiv T1a dhau T11/T22?T1a feem ntau xaiv thaum cov kev pabcuam xav tau rau cov pa roj carbon steel tab sis tsis tas yuav ntxiv chromium rau oxidation (scaling) tsis kam uas T11 lossis T22 muab. Nws yog tus nqi - daws teeb meem zoo rau qhov kub thiab txias ntau yam.
Manufacturing thiab Standards
Txheej txheem:Manufactured liseamlessyeeb nkab / raj los ntawm cov txheej txheem xws li extrusion lossis tho.
Kev kho cua sov:Supplied nyob rau hauvnormalized los yog normalized thiab temperedmob kom ua tiav qhov xav tau txhua yam khoom thiab microstructure.
Kev tswj hwm tus qauv: ASTM A209 / A209M / ASTM A209 / ASTM A209 / ASTM A209 / A209M / ASTM A209 / ASTM A209 / ASTM A209 / ASTM A209 / ASTM A209 / A209M / ASTM A209 / ASTM A209 / A209M / ASTM A209 / ASTM A209 / A209M / ASTM A209 / A209M / ASTM A209 / A209M / ASTM A209 / ASTM A209 / A209M / ASTM A209 / ASTM A209 / ASTM A209 / ASTM A209 / A209M)yog cov khoom specification. Rau kev siv hauv boilers, nws yog saws los ntawmASMEraws liSIB-209.
Cov ntsiab lus tseem ceeb rau kev siv
Weldability:Thaum weldable, nws yuav tsum tau ua ntej-kub thiab tom qab-weld heat treatment (PWHT) cov txheej txheem ntawm ASME Section I los tiv thaiv kev tawg thiab txo kev ntxhov siab.
Oxidation Resistance:Nws tsis muaj chromium, yog li nws tsis kam mus rau chav oxidation thiab flue gas corrosion yog txwv piv rau chromium -muaj qib (T11, T22, T91). Nws tsis haum rau siab -corrosion ib puag ncig.
Kev Ua Raws Cai:Thaum siv rau hauv lub boiler los yog lub nkoj siab, tag nrho cov fabrication, vuam, thiab tshuaj xyuas yuav tsum ua raws li cov seem ntawm ASME Boiler thiab Pressure Vessel Code (feem ntau Tshooj I rau lub hwj chim boilers).
Hauv cov ntsiab lus,SA-209 T1a yog cov hlau ua haujlwm C-Mo hlauuas ua tiav qhov kev ua tau zoo tseem ceeb ntawm cov pa roj carbon steel thiab qis -chromium alloys hauv siab - kub boiler thiab siab siv nkoj.
