Hauv cov liaj teb xws li lub zog, aerospace, thiab petrochemicals, high - qhov chaw ib puag ncig muaj ntau. Cov hlau dog dig yuav poob nws lub zog, ua muag, lossis txawm tias oxidize thiab tsis muaj ntev {}} tej kev mob siab. Yog li ntawd, kub - Tsis kam ua cov hlau tiv thaiv tau dhau los ua cov khoom siv tsis tau. Thaum tshav kub kub - Cov hlau resistant hais txog ib hom hlau uas tuaj yeem tswj hwm kev ruaj khov nyob rau hauv lub siab- qhov ib puag ncig ib puag ncig (feem ntau saum 500 degree). Nws cov kev ua tau zoo yog los ntawm tsim nyog alloy keeb kwm txuam thiab precise kev kho cua sov cov txheej txheem. Yog li, dab tsi tshwj xeeb qib ntawm tshav kub- ion} Cov hlau tiv taus cov hlau tsis muaj?
Ferritic tshav kub -} tiv taus hlau
Kev tiv thaiv hluav taws kub Ferritic - Tsis kam lees cov hlau yog raws li cov hlau- chromium alloys feem ntau yog feem ntau ntawm 10.5% thiab 30%. Hom hlau no muaj oxidation zoo tsis kam thiab thermal conductivity, thiab yog tus nqi qis.
Ib tus sawv cev qib yog 409 stainless hlau. Nws muaj txog 11% chromium thiab ib qho me me ntawm titanium. 409} Cov hlau Stainless tau dav hauv tsheb tso pa tawm. Cov tso tawm ntawm lub tsheb feem ntau ua haujlwm ntawm qhov kub ntawm 300 - 600 degree, uas tuaj yeem ua tau zoo rau kev ua yeeb yam ntawm kev tso pa tawm thiab cov pa taws.
Lwm tus qib ib yog 430 stainless hlau. Nws muaj cov ntsiab lus chromium ntawm 16% - 18%. Piv nrog 409 stainless hlau, nws muaj cov oxidation zoo dua . 430 Stainless hlau ntu uas ua haujlwm hauv nruab nrab ib puag ncig, xws li qhov cub hauv qhov cub. Ncu feem ntau ua haujlwm ntawm qhov kub hauv qab 800 degree, thiab 430 stainless hlau muaj peev xwm tswj nws cov duab thiab kev ua tau ruaj khov nyob rau hauv xws li ib puag ncig, thiab tsis yooj yim sua kom xeb.
Austenitic tshav kub -} tiv taus hlau
Austenitic tshav kub - Tsis kam ntawm cov qauv hluav taws xob yog ib qho hluav taws xob tsis kam nrog chromium thiab npib tsib xee. Nws muaj qhov zoo heev - lub zog kub, kev ua haujlwm tsis taus, thiab tuaj yeem ua haujlwm ntev hauv qhov chaw siab tshaj li 600 degree.
304 Stainless hlau yog ib qho zoo -} paub cov pahtenitic tshav kub- Resistant steel qib. Nws muaj 18% chromium thiab 8% nickel . 304} stainless hlau muaj zoo corrosion tsis kam thiab kub tiv. Nws yog dav siv nyob rau hauv cov khoom noj ua zaub mov noj, xws li cov thobters thiab sterilizers. Cov cuab yeej siv no feem ntau ua haujlwm nyob rau hauv high- kub thiab noo noo. 304 Cov chaw muaj khoom noj tab sis kuj tswj hwm cov khoom siv me me thaum muaj kev kub siab.
310 Stainless hlau yog lub siab -} qib Austenitic tshav kub- tiv taus hlau. Nws muaj 25% chromium thiab 20% npib tsib xee. Cov ntsiab lus ntau cov ntsiab lus ua rau nws ua rau oxidation ntawm qhov kub thiab txias tau siv rau hauv cov chaw ua kom sov, xws li cov phab ntsa sab hauv thiab cov khoom siv ntawm kev kho cua sov. Nyob rau hauv lub siab - sov ib puag ncig ntawm cov cub tawg, 310 stainless hlau muaj peev xwm tswj tau nws cov qauv kev ruaj ntseg thiab tsis yooj yim rau deform lossis oxidize.
Martensitic tshav kub kub-} tiv taus hlau
Martensitic tshav kub kub-} tiv taus hlau yog ib hom cua sov-}} Cov hlau tsis tiv taus uas tuaj yeem tsim cov martensite tom qab kev kho cua sov. Nws muaj lub zog siab thiab hardness ntawm chav sov thiab qee yam kub tiv thaiv.
1C3 yog ib qho kev sib tw martensitic thaum tshav kub kub-} tiv taus qib steel. Nws muaj li ntawm 13% chromium . 1 cr13 muaj qhov zoo heev thiab kub kub ua hauj. Nws feem ntau siv nyob rau hauv valve feem ntawm cov ncab tduab. Chav turbines ua haujlwm nyob rau hauv lub siab - kub thiab siab- lub siab puag ncig. Cov li qub yuav tsum tau tiv thaiv qhov kev cuam tshuam ntawm qhov siab- kub thiab muaj kev ua tau zoo rau kev tsim khoom ua haujlwm nyuaj.
2Cr12Movnbn yog ib qho ntxiv siab dua Martensic tshav kub kub-} tiv taus hlau. Nws ntxiv cov ntsiab xws li Molybdenum, Vanadium, Niobium thiab nitrogen ntawm chromium, uas txhim kho nws qhov siab- kub lub zog thiab cov chrom tsis kam. Cov qib ntawm cov hlau yog siv hauv qhov siab {{6} hill siab} Lub siab kub boiler cov khoom siv, xws li boiler kav thiab headers. Siab - muv boilers feem ntau ua haujlwm nyob rau ntawm qhov kub tshaj 500} Cov qib siab {
Yuav ua li cas xaiv qib kev cai?
Kev xaiv ntawm tshav kub -} ionistant steel qib yuav tsum yog nyob ntawm cov kev ua haujlwm tshwj xeeb. Yog tias nws yog qhov qis - kub (hauv qab 600 degree) thiab qis} Tus nqi siv hluav taws xob tsis kam 409 thiab 430 yog qhov kev xaiv zoo. Txog siab {{9 {{}}} cov qib kub ua kom tau zoo thiab oxidation tsis kam,}}}}}}}}}}}}}} {thiab 310 yog qhov haum ntau. When high strength and certain heat resistance are required in high - pressure environments, martensitic heat - resistant steel such as 1Cr13 and 2Cr12MoVNbN can be considered.
Tsis tas li ntawd, cov ntsiab lus xws li oxidation tsis kam, corrosion tsis kam thiab creep tsis kam yuav tsum tau txiav txim siab. Piv txwv li, hauv ib puag ncig uas muaj cov roj corrosive, ustenitic tshav kub {}} Cov ntsiab lus chromium thiab Nickel cov ntsiab lus tsis kam; in long - term high - temperature and high - pressure environments, heat - resistant steel with good creep resistance should be selected.
Hauv kev xaus, muaj ntau cov qib ntawm tshav kub - Cov hlau tiv taus cov hlau, txhua tus nrog nws tus kheej cov kev ua tau zoo thiab muaj cov xwm txheej sib txawv. Yog xaiv cov cua kub uas tsim nyog tau tsim nyog Nrog kev txhim kho kev lag luam kev lag luam txuas ntxiv ntawm kev lag luam thev naus laus zis, kev ua haujlwm ntawm tshav kub- Cov qhab nia tshiab yuav tshwm sim tau ua kom tau raws li cov kev thov sib txuas ntxiv thiab cov ntawv thov hnyav ntxiv.
