Txheej txheem cej luam
12Cr2MoWVTiB is acreep-resistant, bainitic tshav kub-resistant steel. Nws yog tshwj xeeb tsim los rau siab - kub thiab siab - kev siv siab, feem ntau hauv kev lag luam tsim hluav taws xob. Lub npe ua raws li Suav tus qauv (GB) nomenclature, uas piav txog nws cov tshuaj muaj pes tsawg leeg.
Lub npe "12Cr2MoWVTiB" tawg raws li:
12: Kwv yees cov ntsiab lus carbon hauv pua pua ntawm ib feem pua (0.12% C).
Cr 2: Kwv yees li 2% Chromium.
MoTom ntej: Molybdenum
W: Tungsten.
V: Vanadium.
Ti: Titanium.
B: Boron.
Nws yog Suav sib npaug (thiab kev txhim kho raws li) ntawm cov hlau zoo li ASTM A213 T22, muab kev ua haujlwm siab tshaj - qhov kub thiab txias.
Chemical Composition (Hloov % los ntawm qhov hnyav, raws li GB 5310)
| Lub ntsiab | Cov ntsiab lus (%) | Lub hom phiaj |
|---|---|---|
| Cov pa roj carbon (C) | 0.08 - 0.15 | Muab qhov yooj yim zog. Khaws qis kom zoo weldability. |
| Chromium (Cr) | 1.60 - 2.10 | Muab oxidation (scaling) thiab corrosion kuj. |
| Molybdenum (hli) | 0.50 - 0.65 | Txhim khu lub zog thiab creep tsis kam ntawm qhov kub thiab txias. |
| Tungsten (W) | 0.30 - 0.55 | Khoom siv dag zog; ho txhim kho creep zog. |
| Vanadium (V) | 0.28 - 0.42 | Cov ntaub ntawv ruaj khov carbides (VC, V4C3) uas tiv taus coarsening, ntxiv dag zog rau cov hlau. |
| Titanium (Ti) | 0.08 - 0.18 | Cov ntaub ntawv zoo TiN thiab TiC hais uas pin cov ciam teb, tiv thaiv kev loj hlob ntawm cov nplej. |
| Boron (B) | 0.002 - 0.006 | Segregates rau grain ciam teb, dramatically nce hardenability thiab creep zog. |
| Silicon (Si) | 0.45 - 0.75 | Deoxidizer thaum lub sij hawm steelmaking, muab qee lub zog. |
| Manganese (Mn) | 0.45 - 0.65 | Deoxidizer thiab tiv thaiv brittleness los ntawm sulfur. |
| Phosphorus (P) | Tsawg dua lossis sib npaug li 0.025 | Impurity, khaws cia tsawg los tiv thaiv embrittlement. |
| Sulfur (S) | Tsawg dua lossis sib npaug li 0.015 | Impurity, khaws cia kom tsawg los tiv thaiv kub shortness. |
Cov yam ntxwv tseem ceeb & Khoom
Zoo heev Creep Strength: Nov yog nws cov khoom tseem ceeb tshaj plaws. Creep yog qhov qeeb, mus tas li deformation ntawm cov khoom nyob rau hauv qhov kev ntxhov siab tas li ntawm qhov kub thiab txias. Kev sib xyaw ua ke ntawm Mo, W, V, Ti, thiab B tsim kom muaj kev ruaj khov microstructure uas tiv taus deformation ntev (piv txwv li, 100,000 teev).
Zoo Oxidation Resistance: Cov ntsiab lus ~ 2% Chromium muab cov txheej txheem tiv thaiv oxide (Cr₂O₃) rau ntawm qhov chaw, uas ua rau qeeb oxidation ntxiv (scaling) hauv chav ib puag ncig txog li 600 degree.
Zoo Microstructural Stability: Cov carbides (ntawm V, Ti, Mo, W) tau zoo sib cais thiab tiv thaiv coarsening los yog agglomeration dhau sij hawm, uas yog ib qho tseem ceeb rau kev tuav lub sij hawm ntev - lub zog.
Weldability zoo: Thaum nws yuav tsum tau ua ntej- cua sov thiab tom qab-weld heat treatment (PWHT) zoo li feem ntau cov hlau alloy, nws cov ntsiab lus carbon tsawg ua rau nws tsis tshua muaj kev tawg ntau dua -carbon steels. Cov txheej txheem tsim nyog yuav tsum tau ua raws li nruj me ntsis.
Bainitic Microstructure: Nyob rau hauv nws cov normalized thiab tempered mob, nws muaj ib tug zoo bainitic qauv, uas yog inherently muaj zog thiab tawv nyob rau hauv siab kub.
Daim ntawv thov tseem ceeb: Boiler Tubes thiab cov kav dej
12Cr2MoWVTiB steel kav yuav luag tsuas yog siv rau hauv kev tsim khohigh -siab boilershauv:
Supercritical thiab Ultra-Supercritical Power Plants
Loj Industrial Boilers
Cov chaw tshwj xeeb hauv lub boiler uas nws siv:
Superheaters: Cov raj uas cua sov ua kom dhau nws qhov chaw saturation.
Reheaters: Cov raj uas rov ua kom sov dua tom qab nws tau dhau los ntawm qhov siab -siab turbine.
Main Steam Pipes: Cov kav dej nqa superheated chav los ntawm boiler mus rau lub turbine.
Cov khoom no ua haujlwm nyob rau hauv cov xwm txheej hnyav tshaj plaws hauv cov nroj tsuag, feem ntau ntawm cov hlau kub xws li540℃txog 600℃(1000℃F txog 1110℃F)thiab siab tshaj 2500 psi.
Standards thiab Specifications
Tuam Tshoj (Main Standard): wb 5310- "Seamless steel raj rau kev kub siab boiler"
Nws feem ntau piv rau thiab tuaj yeem hloov pauv rau:
ASTM A213 T22 (2.25Cr-1Mo) - 12Cr2MoWVTiB muaj zog dua.
ASTM A213 T23 (2.25Cr-1.6W-V-Cb) - Ib qib zoo sib xws, niaj hnub Western qib.
Kev tsim khoom thiab kev kho cua sov
Cov kav dej yog tsim los uaseamless(tsis welded) kom muaj kev ncaj ncees nyob rau hauv siab.
Kev kho cua sov txheem yog:
normalizing(kwv yees 1020-1060 degree) ua raws liTempering(nyob ib ncig ntawm 750-780 degree).
Cov txheej txheem no tsim cov tawv, ruaj khov bainitic microstructure xav tau kev pabcuam.
Cov ntsiab lus
Hauv essence,12Cr2MoWVTiB yog cov khoom siv tseem ceeb rau kev ua haujlwm siab, ua kom muaj zog thermal.Nws txoj kev tsim cov hlau tsis zoo tso cai rau cov nroj tsuag hluav taws xob ua haujlwm ntawm qhov kub thiab txias siab, uas txhais tau ncaj qha rauefficiency siab dua thiab qis emissions. Thaum koj pom qhov kev xaiv no, nws txhais tau hais tias muaj kev ua haujlwm siab - cov khoom siv ua haujlwm tau tsim los rau qhov xav tau tshaj plaws siab - ib puag ncig kub.
