Ductile hlau yeeb nkab fittings siv cov hlau nplaum ua cov khoom siv hauv paus. Los ntawm kev ntxiv cov tshuaj spheroidizing (magnesium, tsis tshua muaj lub ntiaj teb) thiab inoculants (ferrosilicon) rau cov hlau molten, lub flake graphite ntawm cov hlau cam khwb cia zoo tib yam tau hloov mus rau hauv cov qauv kheej kheej, hloov pauv cov khoom siv ntawm cov khoom.
1Qib: Khoom siv: Feem ntau siv QT420-5, QT500-7
2: Specification Range: DN80-DN2600, npog mainstream municipal/industrial yeeb nkab diameters
3: Kev Sib Txuas Hom: T- hom, K- hom, N1- hom, N2-hom, M-hom, thiab lwm yam. (kev sib txuas yooj yim / nruj)
4: Cov Txheej Txheem Tsim Khoom: Siab -siab molding / resin xuab zeb core rau cov kav dej hauv qab DN300; Poob ua npuas ncauj nqus casting rau cov kav dej saum DN300
5:Sab hauv / Sab Nrauv Kev Tiv Thaiv Kev Tiv Thaiv: Cov cement mortar sab hauv hauv ob sab phlu, epoxy txheej, zinc txheej + epoxy txheej tiv thaiv corrosion, haum rau cov dej haus, dej phwj tuaj, roj, thiab lwm yam kev siv.
II. Cov yam ntxwv tseem ceeb (Vim li cas xaiv nws?)
1. Mechanical zog: Ua ke lub zog thiab toughness, mus txog ntawm cov hlau.
Tensile zog: 420-500 MPa, uas yog 2-3 npaug ntawm cov grey cam khwb cia hlau (150-300 MPa).
Elongation: Ntau dua lossis sib npaug li 10%, mus txog 15%; zoo tib yam cam khwb cia hlau yuav luag tsis muaj elongation.
Compressive strength/External pressure resistance: >600MPa, faus hauv av tuaj yeem tiv taus av thauj khoom thiab tsheb thauj khoom dynamic.
Impact/Seismic Resistance: Spherical graphite disperses stress, muab kev cuam tshuam zoo heev, kev daws teeb meem hauv av, thiab kev ua haujlwm seismic.
2. Corrosion tsis kam: deb tshaj ntawm cov kav hlau steel, ua rau lub neej ua haujlwm ntev.
A dense oxide film forms on the surface, providing superior resistance to soil acids and alkalis and electrochemical corrosion compared to steel pipes.
Cov cement mortar / epoxy hauv ob sab phlu ntxiv txhim khu kev tiv thaiv corrosion, ua rau nws tsim nyog rau cov cheeb tsam hnyav xws li thaj chaw ntug dej hiav txwv, saline -alkali av, thiab dej phwj ib puag ncig.
Tsim los rau lub neej ntawm 50-100 xyoo, uas yog 2-3 npaug ntawm cov kav hlau zoo tib yam.
3. Sealing thiab yooj: Leak- pov thawj thiab hloov tau rau deformation.
Roj hmab nplhaib nplhaib sib txuas (T- hom, K- hom) ua tiav triple sealing nrog tus nqi qis heev (<0.001L/(min・m)).
Lub interface tso cai rau axial deflection ntawm 5℃-15 degree, haum rau lub hauv paus kev sib hais haum thiab kub expansion/contraction yam tsis tas yuav tsum tau ntxiv expansion pob qij txha.
Interface rwb thaiv tsev txo qhov kev pheej hmoo ntawm electrochemical corrosion.
4. Kev thauj mus los: Kev ua haujlwm siab, tu cev, thiab hnav- tiv taus.
Lub puab phab ntsa du ua rau nws tsis tshua muaj scaling, ua rau lub taub hau poob qis thiab kev thauj mus los siab.
Cov hauv ob sab phlu raws li cov qauv kev nyiam huv, thiab tsis muaj ntxhiab tsw lossis dej paug thaum dej ntws los ntawm nws.
Nrog lub hardness ntawm HB230-280, nws muaj kev hnav zoo dua li cov hlau cam khwb cia zoo tib yam thiab tsim nyog rau kev xa cov xuab zeb - muaj cov kua dej thiab cov dej phwj tuaj.
III. Cov txiaj ntsig tseem ceeb ntawm Kev Xaiv Cov Hlau Yeeb Nkab Fittings
1. Kev ua tau zoo ntawm engineering
Lub zog siab + siab toughness: Siab compressive zog (Ntau dua los yog sib npaug rau 1.6MPa), tiv taus kev sib hais haum thiab av qeeg, ua rau nws yog thawj qhov kev xaiv rau thaj chaw uas muaj geology nyuaj.
Ultra-ntev lifespan: 50–100 xyoo tsim lifespan, txo nqi tag nrho lifecycle hloov.
Kev tiv thaiv corrosion siab heev: Yuav tsum tsis txhob muaj kev tiv thaiv ntau zaus - kev tiv thaiv corrosion, ua rau nws kim heev - zoo rau ntug hiav txwv dej, saline -alkali, thiab dej khib nyiab ib puag ncig.
2. Kev tsim kho thiab kev lag luam zoo
Qhov hnyav dua: 30% -40% sib dua dua li cov kav dej grey cam khwb cia, ua rau txo qis kev thauj mus los, hoisting, thiab cov nqi teeb tsa.
Kev txhim kho yooj yim: Cov roj hmab nplhaib sib txuas, tsis muaj vuam yuav tsum tau, ceev thiab txhim khu kev qha, txhim kho kev tsim kho los ntawm 50% + Tsawg
Cov nqi kho mob: Tus nqi tsis ua haujlwm tsawg, tus nqi qis qis, thiab cov nqi kho tom ntej yog qis dua cov kav hlau thiab PE kav.
Tag nrho cov nqi kom zoo dua: Kev nqis peev thawj zaug yog siab dua me ntsis ntawm cov hlau cam khwb cia, tab sis tag nrho cov sij hawm ntev - tus nqi qis dua.
3. Qhov zoo ntawm cov xwm txheej siv tau
Kev tsim kho hauv nroog: Cov kav dej loj, cov kav dej, cov kav dej phwj tuaj, cov kav dej cua sov; cov ntaub ntawv tseem ceeb rau cov kav dej hauv nroog.
Cov ntawv thov kev lag luam: High-siab / corrosive fluid kev thauj mus los hauv tshuaj lom neeg, roj av, ntawv, thiab kev lag luam mining.
Ib puag ncig tshwj xeeb: thaj chaw av qeeg, cov hauv paus hauv av mos, ntug hiav txwv ntsev- thaj chaw alkali, hla txoj kev loj / kev tsheb ciav hlau, tsis tas yuav muaj kev txhawb nqa ntxiv.
| Kev ua haujlwm / Cov kav dej | Cov yeeb nkab hlau fittings | Ordinary grey cam khwb cia hlau yeeb nkab | cev steel | PE yas yeeb nkab |
| tensile zog | 420-500MPa | 150-300MPa | 400-600MPa | 20-30MPa |
| elongation | Ntau dua lossis sib npaug li 10% | ≈0 | 20%+ | 200%+ |
| Corrosion kuj | Superior rau steel kav | zoo | Tsis zoo (nruam rau corrosion) | Zoo heev (tsis kub resistant) |
| Siab tsis kam | Siab (Ntau dua lossis sib npaug rau 1.6MPa) | nruab nrab | siab | Tsawg (tsawg dua lossis sib npaug rau 1.0MPa) |
| lub neej | 50-100 xyoo | 20-30 xyoo | 20-30 xyoo | 30-50 xyoo |
| Installation nyuaj | Yooj yim (hloov interface) | Yooj yim (rigid interface) | nyuaj (welding) | Yooj yim rau cua sov yaj |
| Tag nrho cov nqi ua haujlwm | ★★★★★ | ★★☆☆☆ | ★★★☆☆ | ★★★★☆ |
V. Summary: Vim Li Cas Thiaj Li Tseem Ceeb Rau Cov Hlau Yeeb Nkab Fittings
Ductile hlau yeeb nkab fittings, nyob rau hauv lub microstructure ntawm spheroidal graphite, ua tiav ib tug zoo meej tshuav nyiaj li cas ntawm siab zog, siab toughness, siab corrosion kuj, ntev kev pab cuam lub neej, thiab yooj yim installation. Lawv daws cov teeb meem ntawm cov hlau cam khwb cia zoo ib yam ua nkig thiab ua rau tawg, thaum tseem kov yeej qhov tsis zoo ntawm cov kav hlau steel ua rau corrosion thiab muaj lub neej luv luv. Tsis tas li ntawd, lawv muaj kev tiv thaiv siab dua, kev kub siab dua, thiab muaj zog tiv thaiv kev laus dua li cov kav dej yas.
Hauv cov xwm txheej xws li cov dej hauv nroog / roj av, cov kua dej ua haujlwm, thiab thaj chaw geologically complex, ductile hlau yeeb nkab fittings yog qhov kev daws teeb meem zoo tshaj plaws ntawm kev nyab xeeb, kev ntseeg siab, thiab kev lag luam, thiab tseem yog qhov kev xaiv tseem ceeb rau cov phiaj xwm thoob ntiaj teb.
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