Thaum tshav kub kub-resistant steel castings yog cov khoom cam khwb cia los ntawm tshav kub-resistant alloy steel li raw cov ntaub ntawv. Nyob rau hauv qhov kub thiab txias, steel nrog oxidation tsis kam, txaus siab kub zog thiab zoo tshav kub kuj hu ua cua sov resistant steel. Thaum tshav kub kub-resistant steel yuav muab faib ua ob hom: oxidation-resistant steel thiab tshav kub-lub zog steel raws li nws cov khoom. Anti-oxidation steel kuj tseem hu ua cov hlau tsis tawv. Kub-lub zog steel yog hais txog cov hlau uas muaj oxidation tsis kam ntawm qhov kub thiab txias siab. Nyob rau hauv cov ntaub ntawv ntawm tib yam tshuaj muaj pes tsawg leeg, lub xeev as-cam khwb cia muaj siab thermal zog tshaj lub xeev dov. Cam khwb cia tshav kub-resistant steel qhov chaw nyob ib tug loj feem nyob rau hauv lub tshav kub-resistant steel.
Qee cov high-alloy heat-resistant steels nyuaj rau txheej txheem thiab deform. Kev tsim cov castings tsis yog tsuas yog siv nyiaj ntau dua li cov khoom siv dov, tab sis kuj castings muaj zog dua endurance. Yog li ntawd, cov cua sov-resistant cam khwb cia hlau occupies ib tug txiav txim siab ntawm cov tshav kub-resistant steel. Ntxiv nrog rau cov xuab zeb casting, precision casting txheej txheem kuj tseem siv tau kom tau cov khoom nrog cov npoo du thiab qhov ntev. Centrifugal casting feem ntau yog siv rau qhov kub kub rauv cov raj rau kev tawg ntawm hluavtaws ammonia thiab ethylene
Raws li cov qauv metallographic nyob rau hauv lub xeev normalized, kub-resistant cam khwb cia hlau yuav muab faib ua plaub pawg: pearlite tshav kub-resistant steel, martensitic tshav kub-resistant steel, ferritic tshav kub-resistant steel, thiab austenitic tshav kub-resistant steel.
1. Pearlitic Thaum tshav kub kub-resistant Cam khwb cia hlau
Cov alloying ntsiab ntawm pearlite tshav kub-resistant cam khwb cia hlau feem ntau yog chromium thiab molybdenum, thiab tag nrho cov nyiaj feem ntau tsis tshaj 5%. Ntxiv nrog rau pearlite thiab ferrite, nws cov qauv kuj muaj bainite. Cov hlau no muaj lub zog kub zoo thiab cov txheej txheem ua haujlwm ntawm 500-600 ℃. Lawv tau dav siv los ua cov khoom kub-resistant hauv qab 600 ℃, xws li boiler steel kav, chav turbine impellers, rotors, fasteners, high-pressure hlab ntsha, pipelines, thiab lwm yam. Cov qib yog: 16Mo, 15CrMo, 12Cr1MoV, 12Cr2MoWVTi2Cr1, 10 , 25Cr2Mo1V, 20Cr3MoWV, etc.
Kev kho cua sov ntawm pearlite tshav kub-resistant steel castings yog feem ntau normalized los yog quenched thiab tempered thiaj li yuav tau ib tug ruaj khov qauv, zoo tag nrho cov neeg kho tshuab zog thiab yuav tsum tau muaj zog nyob rau hauv kub kub tej yam kev mob.
2. Martensitic Thaum tshav kub kub-resistant Cast Steel
Cov ntsiab lus chromium ntawm martensitic tshav kub-resistant cam khwb cia hlau feem ntau yog 7-13%. Nws muaj lub zog kub siab dua, oxidation tsis kam thiab dej vapor corrosion kuj qis dua 650 ℃, tab sis nws cov weldability tsis zoo. 1Cr13, 2Cr13 muaj li ntawm 12% chromium, thiab qib steel tsim los ntawm lub hauv paus no xws li 1Cr11MoV, 1Cr12WMoV, 2Cr12WMoNbVB thiab lwm yam alloys feem ntau yog siv los ua chav turbine hniav, discs, shafts, fasteners, thiab lwm yam.S4Cr12WMoNbVB thiab lwm yam. etc. siv nyob rau hauv kev tsim cov pa tawm li qub rau cov tshuab hluav taws xob sab hauv kuj tseem yog martensitic cua sov-resistant steels.
Cov txheej txheem kev kho cua sov ntau rau martensitic tshav kub-resistant steel castings yog normalizing + tempering.
3. Ferritic Thaum tshav kub kub-resistant Cam khwb cia hlau
Ferritic tshav kub-resistant cam khwb cia hlau muaj ntau chromium, txhuas, silicon thiab lwm yam khoom, tsim ib tug ib-theem ferrite qauv, uas muaj zoo oxidation tsis kam thiab siab kub gas corrosion kuj, tab sis lawv kub siab zog yog tsawg, nyob rau hauv chav tsev kub lub brittleness. yog ntau dua thiab weldability tsis zoo. Xws li 1Cr13SiAl, 1Cr25Si2, thiab lwm yam. Ferritic tshav kub-resistant cam khwb cia hlau feem ntau yog siv los ua cov khoom uas tsis tshua muaj load thiab yuav tsum tau high-temperature oxidation kuj.
Kev kho cua sov ntawm ferritic tshav kub-resistant steel castings feem ntau txais yuav annealing txhawm rau txo kev ntxhov siab, thiab tom qab ntawd txias txias (kom sai dhau los ntawm qhov chaw tawg ntawm 400-500 ℃).
4. Austenitic Thaum tshav kub kub-resistant Cast Steel
Austenitic tshav kub-resistant cam khwb cia hlau muaj ntau austenite-tsim cov ntsiab lus xws li npib tsib xee, manganese, nitrogen, thiab lwm yam, ntawm qhov kub siab tshaj 600 ° C, nws muaj qhov kub thiab txias zog thiab kev ruaj ntseg, thiab kev ua haujlwm zoo vuam. Feem ntau siv los ua cov khoom siv cua sov uas ua haujlwm siab tshaj 600 ° C. Cov qib zoo yog 1Cr18Ni9Ti (321), 1Cr23Ni13 (309), 0Cr25Ni20 (310S), 1Cr25Ni20Si2 (314), 2Cr20Mn9Ni2Si2N, 4Cr14Ni14W2Mo, thiab lwm yam.
Austenitic los tiv thaiv oxidation hlau tuaj yeem kho nrog kev kub siab kev kho cua sov kom tau txais qhov txias deformation. Austenitic kub-lub zog steel yog thawj zaug kho nrog high-temperature tov kev kho mob, thiab tom qab ntawd kev laus kev kho mob yog nqa tawm ntawm 60-100 ℃ siab tshaj qhov kev siv kub kom stabilize tus qauv thiab precipitate theem ob kom ntxiv dag zog rau matrix.
Kev siv cov cua kub-resistant hlau Castings
Thaum tshav kub kub-resistant steel feem ntau yog siv los tsim cov khoom thiab cov khoom uas ua haujlwm ntawm qhov kub thiab txias hauv kev lag luam xws li boilers, chav turbines, lub zog siv hluav taws xob, cov khoom siv hluav taws xob, thiab kev lag luam aviation thiab petrochemical industries. Ntxiv nrog rau qhov kub thiab txias zog thiab kub-kub oxidation thiab corrosion kuj, cov khoom no kuj yuav tsum tau txaus toughness, zoo workability thiab weldability, thiab ib tug tej yam degree ntawm kev ruaj ntseg raws li kev siv sib txawv.
Qee qib ntawm Cov Hluav Taws Xob Hluav Taws Xob Hluav Taws Xob thiab lawv cov ntawv thov | |
| Qib Steel | Ua haujlwm kub thiab siv tau |
| 00 cr12 | Anti-oxidation kub 600 ~ 700 ℃, siv raws li qhov kub thiab txias, siab siab valve lub cev, burner |
| 0c13 ua | Siv tau qhov kub ntawm 700 ~ 800 ℃, roj turbine compressor hniav |
| 1 cr17 | Kev tiv thaiv oxidation ntawm qhov kub qis dua 900 ℃, siv los ua qhov kub thiab txias rau qhov cub |
| 1 Cr12 | Oxidation tsis kam thiab siab kub lub zog nyob rau hauv qhov kub ntawm 600 ~ 700 ℃ thiab siv rau qhov kub thiab txias qhov chaw ntawm chav turbine hniav, nozzles, thiab boiler burner li qub. |
| 1 Cr13 | oxidation kuj kub yog 700 ~ 800 ℃, thiab nws siv yog tib yam li 1Cr12 steel. |
| 0Cr18Ni9, 1Cr18Ni9Ti | Kev tiv thaiv oxidation kub hauv qab 870 ℃, tuaj yeem siv ua boiler cua sov nto yeeb nkab, cua sov rauv qhov chaw, kub exchanger, muffle rauv, converter, nozzle |
| 0Cr18Ni10Ti, 0Cr18Ni11Nb | Nws yog resistant rau kub corrosion thiab oxidation nyob rau hauv qhov kub ntawm 400 ~ 900 ℃, thiab yuav siv tau rau cov yeeb nkab fittings uas nws ua hauj lwm kub yog qis dua 850 ℃ |
| 0Cr23Ni13 | Kev tiv thaiv oxidation kub txog li 980 ℃, siv rau lub qhov cub hluav taws kub, lub tshuab hluav taws xob siv hluav taws xob, lub tshuab hluav taws xob cua sov lub cev, methane hloov dua siab tshiab, kub sib cais ntaus ntawv |
| 0Cr25Ni20 | Anti-oxidation kub txog 1035 ℃, siv rau cua sov qhov cub; gas kis system qhov chaw nrog ua haujlwm kub hauv qab 950 ℃ |
| 0Cr17Ni12Mo2, 0Cr19Ni13Mo2 | Kev tiv thaiv oxidation kub tsis qis dua 870 ℃, kev ua haujlwm kub yog 600 ~ 750 ℃, cov cua kub exchanger raj thiab cub fittings rau chemical kev lag luam thiab roj refining. |
| 0Cr17Ni7Al | Qhov kub thiab txias load-bearing qhov chaw nrog ua haujlwm kub hauv qab 550 ℃ |
Post lub sij hawm: Sep-10-2021