Khoom Taw Qhia

Nodular cam khwb cia hlau manhole npog yog ib yam ntawm nodular cam khwb cia hlau cov khoom, nodular cam khwb cia hlau los ntawm spheroidization thiab inoculation kev kho mob kom tau txais spherical graphite, zoo txhim kho cov neeg kho tshuab zog ntawm cam khwb cia hlau, tshwj xeeb tshaj yog txhim kho cov yas thiab toughness, thiaj li yuav tau txais lub zog siab dua. carbon hlau. Ductile hlau yog ib yam ntawm cov khoom muaj zog cam khwb cia hlau tsim nyob rau hauv 1950s, nws cov kev ua tau zoo yog nyob ze rau cov hlau, nws yog raws li nws cov kev ua tau zoo heev, tau ntse siv los nrum ib co complex zog, lub zog, toughness, hnav tsis kam yuav tsum tau. qhov siab. Ductile hlau tau tsim sai sai rau hauv cov khoom siv hlau cam thib ob rau grey hlau thiab dav siv. Lub npe hu ua "hlau es tsis txhob steel" feem ntau yog hais txog cov hlau ductile.

Kev faib khoom

Ductile hlau manhole npog feem ntau muab faib ua puag ncig thiab square, nyob rau hauv nroog txoj kev tswj hwm, kev siv dav dav, vim hais tias puag ncig manhole npog tsis yooj yim rau qaij, tuaj yeem tiv thaiv kev nyab xeeb ntawm cov neeg taug kev thiab tsheb zoo dua. Kev siv lub voj voog yog tsuas yog xav txog tias txhua txoj kab uas hla ntawm lub voj voog manhole npog los ntawm nws qhov chaw yog tib yam, yog li ntawd yog tias lub hau npog npog yog dov los ntawm lub tsheb dhau, vim tias tsis hais nws yuav dov li cas, nws txoj kab uas hla. yuav yog me ntsis dav dua li nram qab no lub qhov dej, thiab lub manhole npog yuav tsis poob rau hauv lub qhov dej.

Yog hais tias lub square yog siv, vim hais tias cov kab pheeb ces kaum ntawm lub square yog pom tseeb ntev dua qhov ntev ntawm txhua sab, xws li ib tug manhole npog yog dov, nws yog ib qho yooj yim mus poob rau hauv lub qhov dej raws kab pheeb ces kaum ntawm lub qhov dej, ua rau muaj kev nyab xeeb. Yog tias lub taub hau zoo sib npaug lossis me dua lub hau, lub hau square yuav tsis poob rau hauv qhov dej. Ntawm no yog lo lus nug ntawm kev siv ntau tshaj plaws thiab kev lag luam ntawm cov ntaub ntawv. Kev siv lub hau npog yog nyob ntawm qhov loj ntawm lub qhov dej, yog tias koj yuav tsum tau nruab ib lub voj voog manhole npog nrog thaj tsam loj dua li lub qhov dej, ces qhov kev siv thiab cov txiaj ntsig ntawm cov khoom siv tau zoo dua li kev siv ncaj qha. lub voj voog manhole npog, uas tsis tsuas yog txuag cov khoom ntawm lub manhole npog, tab sis kuj ua kom muaj kev nyab xeeb ntawm lub qhov dej.

Ductile hlau manhole npog

Nyob rau hauv lub countryside thiab cable Wells, square feem ntau yog siv, uas yuav zoo dua tiv thaiv kev nkag ntawm cov kua xws li los nag.

Ikhoom noj

Pig hlau yog cov hlau-carbon alloy nrog cov ntsiab lus carbon ntau dua 2%, thiab cov ntsiab lus carbon ntawm cov npua hlau yog feem ntau 2.5% --4%, thiab muaj C, SI, Mn, S, P thiab lwm yam. cov khoom, uas yog cov khoom ntawm smelting hlau ore los ntawm blast furnace. Raws li cov ntaub ntawv sib txawv ntawm cov pa roj carbon monoxide hauv npua hlau, nws tuaj yeem muab faib ua steelmaking npua hlau, cam khwb cia npua hlau thiab ductile hlau.

Lub precipitated graphite yog spherical cam khwb cia hlau. Kev txiav cov nyhuv ntawm spherical graphite ntawm cov hlau matrix yog me dua li ntawm flake graphite, kom lub zog ntawm cam khwb cia hlau ncav cuag 70 ~ 9{11}}% ntawm lub zog ntawm matrix, lub zog tensile tuaj yeem ncav cuag 120kgf / mm2, thiab nws muaj zog toughness. Ntxiv nrog rau cov hlau, cov tshuaj muaj pes tsawg leeg ntawm cov hlau ductile feem ntau yog: cov ntsiab lus carbon 3.6 ~ 3.8%, silicon cov ntsiab lus 2.0 ~ 3.0%, tag nrho cov manganese, phosphorus, sulfur tsis pub tshaj 1.5% thiab cov nyiaj tsim nyog ntawm lub ntiaj teb tsis tshua muaj, magnesium thiab lwm yam nodulators.

Lwm cov ntaub ntawv

Ductile hlau manhole npog feem ntau yog ua los ntawm cov hlau hlau manhole npog, thiab qhov zoo ntawm no manhole npog muaj qhov teeb meem ntawm spheroidization tus nqi. Feem ntau siv txheej rau kev kho cov castings yog anti-xeb asphalt xim, ntawm chav kawm, qhov saum npoo ntawm cov ductile hlau manhole npog kuj raug kho los ntawm cov tshuaj tsuag los tiv thaiv xeb asphalt xim. Ductile hlau manhole npog muaj ib qho txiaj ntsig, uas yog, vim muaj lub zog siab thiab zoo tawv ntawm cov hlau hlau, cov hlau hlau manhole npog yog li 30% sib dua li tib hom grey cam khwb cia hlau manhole npog.

Nta ntawm ductile hlau manhole npog

Zoo toughness. Tus nqi cuam tshuam zoo ib yam li cov pa roj carbon nruab nrab thiab ntau dua 10 npaug ntawm cov hlau grey.

Muaj zog corrosion kuj. Dej tshuaj tsuag corrosion test, 90 hnub ntawm corrosion tsuas yog 1/40 ntawm cov yeeb nkab steel, yog 1/10 ntawm cov yeeb nkab hlau grey. Kev pabcuam lub neej yog 2 npaug ntawm cov yeeb nkab hlau grey thiab 5 npaug ntawm cov yeeb nkab steel.

Zoo plasticity. Elongation Ntau dua lossis sib npaug li 7%, zoo ib yam li cov pa roj carbon siab, thaum grey hlau cov khoom elongation yog xoom.

Siab zog. Tensile zog ob Ntau dua los yog sib npaug rau 420MPa, yield zog os Ntau dua los yog sib npaug rau 300MPa, tib yam li cov pa roj carbon tsawg, yog peb npaug ntawm cov khoom siv hlau grey.

Vim lub spheroidal graphite microstructure ntawm cov hlau ductile, ductile hlau yog zoo dua cam khwb cia hlau nyob rau hauv txo kev co muaj peev xwm, yog li nws yog ntau conducive rau txo kev ntxhov siab. Ib qho laj thawj tseem ceeb los xaiv cov hlau nplaum yog tias cov hlau nplaum yog pheej yig dua li cov hlau cam khwb cia. Tus nqi qis ntawm cov hlau nplaum ua rau cov khoom siv no nrov dua, kev ua haujlwm zoo dua, thiab tseem txo cov nqi machining ntawm cov khoom siv hlau.

Lub zog ntawm ductile hlau yog piv rau cov cam khwb cia hlau. Cov hlau ductile muaj lub zog ntau dua, nrog qhov tsawg kawg nkaus lub zog ntawm 40k, thaum lub zog ntawm cov cam khwb cia hlau tsuas yog 36k. Hauv cov ntawv thov hauv nroog feem ntau, xws li dej, dej ntsev, chav dej, thiab lwm yam, qhov kev tiv thaiv corrosion thiab oxidation tsis kam ntawm cov hlau ductile ntau tshaj cov hlau cam khwb cia.

Khoom

Cov hlau hlau castings tau siv nyob rau hauv yuav luag tag nrho cov kev lag luam loj, uas yuav tsum muaj lub zog siab, plasticity, toughness, hnav tsis kam, tsis kam rau thermal thiab mechanical shock, siab lossis kub tsis kam, corrosion resistance thiab dimension stability. Txhawm rau ua kom tau raws li cov kev hloov pauv no hauv kev siv, cov hlau nplaum muaj nyob hauv ntau qib, muab ntau yam khoom siv thiab lub cev.

Feem ntau cov nodular cam khwb cia hlau castings, raws li tau teev tseg los ntawm International Organization for Standardization ISO1083, mas yog tsim nyob rau hauv ib tug tsis-alloying xeev. Pom tseeb, qhov no suav nrog qib siab zog nrog lub zog tensile ntau dua 800 newtons / mm thiab elongation ntawm 2%. Nyob rau lwm qhov kawg yog cov qib yas siab nrog elongation ntau dua 17% thiab muaj zog tsis muaj zog (tsawg li 370 Newton / mm). Lub zog thiab elongation tsis yog tib txoj hauv kev rau cov neeg tsim qauv xaiv cov ntaub ntawv, tab sis lwm yam khoom tseem ceeb suav nrog kev tawm dag zog, kev hloov pauv ntawm elasticity, hnav tsis kam thiab qaug zog, hardness thiab cuam tshuam cov khoom. Tsis tas li ntawd, kev tiv thaiv corrosion thiab oxidation tsis kam nrog rau cov khoom siv hluav taws xob kuj tseem ceeb rau cov neeg tsim qauv. Yuav kom ua tau raws li cov kev siv tshwj xeeb no, ib pawg ntawm austenitic ductile hlau tau tsim, uas feem ntau hu ua austenitic ductile hlau. Cov nodules austenitic feem ntau yog alloyed nrog zinc, chromium thiab manganese thiab suav nrog cov qauv thoob ntiaj teb.

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Copper Silica Sol Investment Casting

Peb yog cov chaw tsim khoom ntawm "Gas station ductile iron manhole cover", yog tias koj xav tau cov ntaub ntawv ntxiv thov hu rau peb!