Thaum tshav kub kub-Resistant Qib Ua rau Kev Pabcuam Siab
12Cr2MoG yog chromium-molybdenum ferritic alloy steel yeeb nkab standardized nyob rau hauv GB 5310 rau siab- siab boiler daim ntaub ntawv, thiab nws cov thoob ntiaj teb counterpart yog 2.25Cr-1Mo chav kawm muab raws li P22 yeeb nkab nyob rau hauv ASTM A335 thiab raws li T22 A21 ASTM raj nyob rau hauv . Cov qib muaj cov ntaub ntawv teev tseg ntev hauv cov chaw siv hluav taws xob fossil thiab cov nroj tsuag petrochemical, qhov chaw uas nws nqa cov pa thiab cov pa roj ntawm qhov kub thiab txias uas yuav ua rau cov pa roj carbon zoo. Nws cov cuab yeej txhais tau tias yog creep tsis kam, muaj peev xwm tiv taus qeeb deformation nyob rau hauv qhov kev ntxhov siab tas li ntawm qhov kub thiab txias, thiab qhov no yog qhov ua rau nws cov khoom xaiv rau cov khoom siv siab-cov kabmob ua haujlwm nyob rau thaj tsam ntawm 520 txog 580 degrees Celsius.
Tshuaj muaj pes tsawg leeg
| Lub ntsiab | Qhov ntau yam, feem pua | Lub hom phiaj |
|---|---|---|
| Cov pa roj carbon | 0.08 - 0.15 | Lub zog thiab hardenability |
| Silicon | 0.17 - 0.37 | Deoxidation |
| Manganese | 0.40 - 0.70 | Deoxidation, toughness |
| Phosphorus | 0.025 Max | Cov khoom seem, tswj tau |
| Sulfur | 0.010 max | Cov khoom seem, tswj tau |
| Chromium | 2.00 - 2.50 | Oxidation kuj, carbide tsim |
| Molybdenum | 0.90 - 1.20 | Kev daws teeb meem ntxiv dag zog, creep kuj |
Chromium thiab molybdenum ua ke tsim cov khoom zoo, ruaj khov carbides hauv microstructure, uas yog cov txheej txheem tom qab qib siab - qhov kub thiab txias. Qhov tsis muaj leej faj txwv tsis pub muaj teeb meem vim hais tias leej faj ua ke nrog manganese los ua cov sib xyaw ua ke uas txo cov tawv nqaij, tshwj xeeb tshaj yog nyob rau hauv tshav kub - cuam tshuam cheeb tsam ntawm ib qho vuam.
Mechanical Properties thiab Kev kho cua sov
Cov yeeb nkab thiab raj hauv chav kawm 2.25Cr-1Mo raug xa mus rau hauv cov xwm txheej zoo li qub thiab tempered. Nyob rau hauv ASTM A335 thiab A213 qhov tsawg kawg nkaus tensile lub zog yog 415 MPa thiab qhov tsawg kawg nkaus yield zog yog 205 MPa; longitudinal elongation yuav tsum ncav cuag tsawg kawg 30 feem pua, thiab cov specifications teem ib tug tsawg kawg nkaus tempering kub ntawm 675 degrees Celsius. Nyob rau hauv kev xyaum normalizing yog nqa tawm nyob rau hauv lub cheeb tsam ntawm 900 mus rau 960 degrees Celsius tom qab cua txias, thiab tempering yog ua nyob rau hauv ib tug kub thiab txias uas ua rau ib tug ruaj khov bainitic microstructure uas yuav tsum tau ua ke ntawm lub zog, toughness thiab creep lub neej.
Vim tias kev kho cua sov tswj tau lub sijhawm ntev - kev ua tau zoo ntawm qib no, daim ntawv pov thawj zeb xeem yuav tsum sau cov ntsuas kub, qhov kub thiab txias thiab qhov ua kom muaj zog tensile. Cov yeeb nkab uas ua tau raws li qhov yuav tsum tau muaj zog tab sis tau tempered ntawm qhov kub thiab txias yuav tsis xa nws lub neej tsim.
Daim ntawv thov hauv Cov Hluav Taws Xob thiab Txheej Txheem
Superheater thiab reheater tube txhab nyiaj hauv subcritical thiab supercritical boilers
Cov kab tseem ceeb, cov kab kub reheat thiab headers hauv thermal fais fab chaw nres tsheb
Siab - kub siab lub nkoj plhaub thiab taub hau
Hydrocracking thiab catalytic hloov kho cov cuab yeej hauv refineries
Thaum tshav kub kub exchanger thiab hloov cov kav dej nqa cov hydrogen kub - muaj cov kwj deg
Cov qib kuj tseem siv tau qhov uas yuav tsum tau muaj kev tiv thaiv rau hydrogen nres, vim nws cov ntsiab lus chromium thiab molybdenum nce qhov tsis kam ntawm cov hlau rau hydrogen kev puas tsuaj ntawm qhov kub thiab txias.
Ordering thiab Fabrication Points
Ib qho kev txiav txim tiav hais txog tus qauv, qib, txoj kev tsim khoom, sab nraud txoj kab uas hla thiab phab ntsa thickness los yog lub sij hawm, lub hauv paus ntev thiab qhov yuav tsum tau ua. Rau kev pabcuam siab txoj kev tsim khoom yog seamless, tsim los ntawm kev tho ib lub pob zeb, uas tshem tawm cov longitudinal weld los ntawm qhov chaw uas creep puas zoo li mloog zoo. Tubing destined rau cov kev pab cuam thaum tshav kub kub exchanger feem ntau yuav tsum tighter phab ntsa tolerances thiab eddy tam sim no kev ntsuam xyuas, thaum hnyav phab ntsa yeeb nkab rau headers yog ib txwm muab nrog ultrasonic kuaj.
Vuam yuav tsum siv consumables uas txuam chromium thiab molybdenum cov ntsiab lus, nrog preheat nyob rau hauv thaj tsam ntawm 150 mus rau 250 degrees Celsius rau thicker seem thiab post-weld tshav kub kho rau qhov chaw siab. Cov txheej txheem vuam yuav tsum tsim nyog, thiab kev kuaj xyuas qhov nyuaj ntawm qhov sib koom ua ke yog ib txoj hauv kev ua kom paub tseeb tias qhov kev tshaj tawm -weld heat treatment tau zoo. Kev saib xyuas kuj yuav tsum tau ua kom cov sib koom ua ke kom qhuav thiab tsis txhob muaj cov kab mob tooj liab thaum tsim khoom.
FAQ
Q: Dab tsi yog ASTM sib npaug ntawm 12Cr2MoG?
Nws sib haum rau 2.25Cr-1Mo chav kawm, muab raws li ASTM A335 P22 yeeb nkab thiab ASTM A213 T22 raj, txawm hais tias qhov tseeb chemistry ranges tau txhais los ntawm kev tswj hwm ntawm txhua qhov kev txiav txim.
Q: Qhov ntsuas kub npaum li cas yog qib no tsim los rau?
Nws feem ntau yog siv li ntawm 520 thiab 580 degrees Celsius, uas yog qhov chaw uas nws lub zog creep siv tau zoo.
Q: Vim li cas qhov tsawg kawg nkaus tempering kub tau teev tseg?
Tempering saum qhov tsawg kawg nkaus ua kom ntseeg tau tias lub microstructure ruaj khov thiab qhov kev xav tau nkag mus tau ua tiav nyob rau hauv kev pabcuam ntev -.
Q: Puas yog seamless yeeb nkab yuav tsum tau?
Rau qhov chaw siab, seamless yeeb nkab yog qhov kev xaiv ib txwm vim nws tsis muaj vuam seam nyob rau hauv cheeb tsam uas creep puas yuav txwv tsis pub mloog.
Q: Yuav ua li cas cov yeeb nkab yuav khaws cia rau ntawm qhov chaw?
Khaws qhov ntev kom qhuav, tiv thaiv los ntawm kev puas tsuaj thiab muab cais los ntawm cov xov tooj cua sov kom traceability rau daim ntawv pov thawj zeb.
Q: Cov qib puas tuaj yeem hloov tau los ntawm 9Cr steel?
Siab dua - qib chromium tso cai rau cov phab ntsa nyias nyias ntawm tib lub luag haujlwm, tab sis lawv raug nqi ntau dua thiab xav tau kev tswj vuam nruj dua, yog li qhov kev hloov pauv yog qhov kev txiav txim siab tsim es tsis yog kev hloov pauv yooj yim.
