Dab tsi yog cov tshuaj lom neeg muaj pes tsawg leeg ntawm Astm A335 P122 yeeb nkab hlau?
ASTM A335 P122 yog cov hlau sib xyaw hlau. Nws qhov tseem ceeb cov tshuaj muaj pes tsawg leeg suav nrog: kwv yees 11 - 12% chromium (CR), uas muab cov oxidation zoo thiab corrosion tsis kam; Kwv yees li 0.7 {{- 1.2% Molybdenum (Mo) thiab kwv yees li 0.6% Tungsten (W), uas ua ke {} lub zog kub; Kwv yees li 0.04-0.10% Vanadium (v) thiab kwv yees li 0.04-0.10% niobium (nb), uas muab kev tshem tawm muaj ntxiv los ntawm kev tsim cov roj carbon monoxide. Thiab kwv yees li 0.03-0.07% nitrogen (n) thiab kab nqi ntawm boron (b) rau kev ruaj khov txuas ntxiv thiab ua lub zog txuas ntxiv. Cov pa roj carbon (c) cov ntsiab lus khaws cia qis (0.07-0.14%) kom sib npaug lub zog thiab weldability. Qhov no txoj kev sib xyaw no yog tsim los tswj kev ua tau zoo heev nyob rau hauv qhov kev kub kub thiab siab ib puag ncig ib puag ncig ntawm ultra-supercritical fais fab nroj tsuag.
Dab tsi yog cov khoom tseem ceeb ntawm p122 steel yeeb nkab?
Cov khoom siv khomob raug yuav tsum tau ua rau P122 yeeb nkab rau ntawm chav sov muaj xws li 620 mpa, kom muaj zog ntawm tsawg kawg 400 MPA, thiab elongation ntawm tsawg kawg 20%. Cov khoom no tau ua tiav los ntawm ib qho kev coj ua thiab kev ua kom sov sov, ua kom cov khoom siv ua ke nrog cov tawv muaj zog txaus. Nws lub siab - kub taub hau tawg yog qhov tseem ceeb tshaj plaws ntawm kev kub siab ntawm 600 {650℃rau ncua sijhawm tsis muaj kev ua tsis tiav. Cov khoom siv tau zoo heev ua rau nws cov khoom zoo tshaj plaws rau kev tsim khoom loj superheatre thiab maj mam leeg rau ultra-supercritical boilers.
Dab tsi yog kev txhim kho ntawm P122 tshaj P91?
P122 yog ib qho kev tsim tawm cov hlau ua ntej los ntawm P91. Nws qhov tseem ceeb txhim kho nyob rau hauv kev sib ntxiv ntawm kwv yees li 1% tungsten (w), muaj tus tooj liab siab dua (b) cov ntsiab lus. Cov khoom siv hluav taws xob alloy no thiaj li txhim kho cov khoom siv thiab nag lossis dej nag cua kub ua kom muaj zog, ua rau muaj kev kub ntxhov siab li 20-30% siab dua li ntawm P91. Yog li ntawd, pm122 tso cai rau cov neeg tsim qauv los siv cov haujlwm ua haujlwm siab (ntsuas kub thiab siab dua lub neej ntev dua thiab kev muaj kev nyab xeeb ntev thiab kev nyab xeeb kev nyab xeeb npoo ntawm kev ua haujlwm sib npaug.
Dab tsi yog cov mineuctionge ntawm p122 steel?
Tom qab txheem ib txwm ua thiab tempering kev kho cua sov, pМ2 hlau ua pov thawj kub martension. Qhov no yog qhov ruaj khov, lath- zoo li kev nthuav dav ua kom pom kev muaj zog thiab kev ua tau zoo. Tseem ceeb tshaj, zoo M23C6 carbide thiab mx (v, nb) carbonitride precipitates yog uniformly faib tawm hauv martensite martensite martensite. Cov khoom zoo no ua ntej tus pin cov qoob loo zoo zoo thiab cov dislocations, hode txoj kab qab thiab tshem tawm ntawm cov khoom kub siab. Qhov no yog lub txiaj ntsig zoo rau nws qhov siab zoo heev - lub zog txias.
Ua si hauv P122 li cas hauv P122? Txawm hais tias Boron (b) yog ib txoj lw caij ntxiv rau P122 (feem ntau tsuas yog 0.001%- 0.006%), nws plays ib qho tseem ceeb heev. Boron atoms zoo li muaj thaj tsam ntawm cov ciaj ciam av, maj mam cov coarsening ntawm carbides nyob ntawd, muaj stabilizing cov hmoov nplej sib dhos. Thaum ntev - kev pab thaum muaj qhov kub, cov ciaj ciam av yog cov chaw ruaj khov uas tau pib yooj yim pib ua haujlwm yooj yim. Qhov no "qoob loo ciam lwm txoj kev ntxiv dag zog" cov txiaj ntsig ntawm Boron tuaj yeem ncua cov khoom puas ntawm cov khoom siv ntev- kub lub neej thiab ruaj khov.
