Ductile cam khwb cia hlau manhole npog yog tsim los ntawm nodular cam khwb cia hlau.Qhov zoo ntawm no manhole npog muaj qhov teeb meem ntawm spheroidization tus nqi.Feem ntau siv txheej rau castings yog anti-xeb asphalt xim.Ntawm chav kawm, qhov saum npoo ntawm cov hlau nplaum manhole npog kuj yog txau nrog cov xim pleev xim asphalt.Qhov kom zoo dua ntawm cov hlau hlau manhole npog yog vim muaj lub zog siab thiab tawv ntawm cov hlau hlau, cov hlau hlau manhole npog yog li 30% sib dua li grey cam khwb cia hlau manhole npog ntawm tib hom.Piv nrog rau cov kev lag luam uas twb muaj lawm, qhov kev thov rau ductile hlau manhole npog yog qhov loj vim tias nws qhov kev ua tau zoo dua li ntawm cov hlau cam khwb cia, yog li ntau cov dej ntws yuav muab qhov tseem ceeb rau cov hlau manhole npog.
①.Qhov sib txawv ntawm cam khwb cia hlau manhole npog thiab ductile hlau manhole npog yog:
1. Lub graphite ntawm grey hlau yog tiaj thiab flake, thiab graphite ntawm cov hlau hlau yog kheej kheej.Yog hais tias spheroidal graphite cam khwb cia hlau raug ntaus nrog lub suab zoo ib yam li cov pa roj carbon steel, nws qhia tau hais tias spheroidal graphite cam khwb cia hlau yog zoo spheroidized.Tab sis lub suab ntawm grey hlau percussion suab dull.
2. Hais txog qhov teeb meem ntawm spheroidization tus nqi, tib yam yog cov khoom ntawm cov hlau ductile.Txawv spheroidization tus nqi txhais tau tias sib txawv zoo thiab tus nqi.Tus nqi spheroidization ntawm cov chaw ua haujlwm zoo tib yam tau mus txog 85% raws li cov khoom tsim nyog.spheroidization tus nqi qis dua 85% yog vim lub sij hawm ntawm casting, molten hlau kub yog tsawg vim tsis muaj spheroidization, thiab bearing siab ntawm cov khoom tsim tsis tau raws li qhov yuav tsum tau.
3. Los ntawm cov tsos ntawm cov pob txha tawg (tsis mechanically processed), ductile hlau thiab grey hlau tuaj yeem paub qhov txawv yooj yim.Pom nrog lub qhov muag liab qab, cov pob zeb siv lead ua ntawm cov pob txha ntawm cov hlau grey yog cov ntxhib, grey-dawb, thiab cov khoom siv lead ua muaj xim hlau.Cov pob txha tawg ntawm cov hlau nplaum yog me me thiab dub-grey.Yog hais tias lub spheroidization yog zoo, yuav luag tsis muaj metallic luster.Yog tias muaj xim dawb, qhov xwm txheej ib txwm yog lub qhov ncauj dawb.
4. Nyob rau hauv cov nqe lus ntawm smelting txoj kev, nodular hlau yog ntxiv nrog inoculant thiab spheroidizing tus neeg saib xyuas rau grey hlau thaum smelting kom graphite hloov los ntawm dispersed flocculent mus spherical, thiaj li yuav txo tau lub fragmentation ntawm ferrite thiab ua kom lub zog., hais txog kev ua tau zoo los txog.
5. Lub hau grey hlau manhole tsis ntxiv cov khoom siv, thiab npua hlau ncaj qha mus rau hauv cov hlau molten, thiab tom qab ntawd nchuav rau hauv lub hau npog.Txawm li cas los xij, ductile hlau manhole npog yog ua los ntawm nodularizing tus neeg saib xyuas, tsis tshua muaj lub ntiaj teb magnesium thiab lwm yam hlau alloys.Yog li ntawd, kev ua lag luam thiab cov tuam tsev muaj feem cuam tshuam tam sim no thov kom siv cov ntaub qhwv hlau manhole npog.Cov kabmob muaj peev xwm ntawm cov hlua hlau manhole npog deb tshaj qhov ntawm grey hlau manhole npog.
6.Lub ductile hlau muaj lub zog siab thiab zoo toughness, yog li cov ductile manhole npog yog li 30% sib dua li cov grey cam khwb cia hlau manhole npog ntawm tib hom.Qib ntawm nodular cam khwb cia hlau yog QT500-7, molten hlau kub tsis qis dua 1456 ℃, tsis tshua muaj lub ntiaj teb ferrosilicon-magnesium alloy thiab coke nrog cov ntsiab lus tsis tshua muaj leej faj ntxiv thaum kho spheroidizing, thiab qib spheroidizing yog siab dua qib 3.
②.Features ntawm ductile hlau manhole npog:
1. Zoo toughness.Tus nqi cuam tshuam zoo ib yam li cov pa roj carbon nruab nrab, ntau dua 10 npaug ntawm cov hlau grey.
2. Muaj zog corrosion kuj.Nyob rau hauv cov dej tshuaj tsuag corrosion, tus nqi corrosion nyob rau hauv 90 hnub tsuas yog 1/40 ntawm cov kav hlau thiab 1/10 ntawm cov kav hlau grey.Lub neej kev pabcuam yog ob zaug ntawm cov kav hlau grey thiab 5 npaug ntawm cov kav hlau zoo tib yam.
3. Zoo plasticity.Qhov elongation tus nqi yog ≥7%, uas zoo ib yam li cov hlau carbon siab, thaum lub elongation tus nqi ntawm grey hlau cov ntaub ntawv yog xoom.
4. Lub zog muaj zog.Tensile lub zog ób≥420MPa, tawm lub zog ós≥300MPa, uas yog tib yam li cov pa roj carbon tsawg thiab peb npaug ntawm cov khoom siv hlau grey.
Post lub sij hawm: Dec-09-2021