Chaw muag khoom ntawm siab zinc coated galvanized steel yeeb nkab
Galvanized steel yeeb nkab yog muab faib ua txias galvanized steel yeeb nkab thiab kub-dip galvanized steel yeeb nkab. Cov yeeb nkab txias galvanized steel tau raug txwv, thiab tom kawg kuj tau tawm tswv yim los ntawm lub xeev kom siv tau ib ntus. Nyob rau xyoo 1960 thiab xyoo 1970, cov teb chaws tsim kho hauv ntiaj teb tau pib tsim cov kav dej tshiab, thiab cov kav dej galvanized raug txwv ib zaug. Tuam Tshoj lub Ministry ntawm kev tsim kho thiab lwm plaub lub tuam tsev thiab cov thawj coj kuj tau qhia meej tias cov kav dej galvanized tau raug txwv tsis pub siv cov kav dej txij li xyoo 2000. Galvanized kav dej tsis tshua siv hauv cov kav dej txias hauv cov zej zog tshiab, thiab cov kav dej galvanized yog siv hauv cov kav dej kub. hauv tej zej zog. Kub dip galvanized steel yeeb nkab yog dav siv hauv kev tua hluav taws, hluav taws xob hluav taws xob thiab kev nthuav dav. Kub dip galvanized steel kav yog siv dav hauv kev tsim kho, tshuab, thee mining, tshuaj lom neeg kev lag luam, hluav taws xob fais fab, tsheb ciav hlau, tsheb kev lag luam, kev loj, txuas hniav, ntim khoom, chaw ua kis las, tshuab ua liaj ua teb, roj av machinery, kev tshawb nrhiav tshuab thiab lwm yam kev lag luam.
Welded steel yeeb nkab nrog kub-dip los yog electro galvanized txheej rau saum npoo ntawm galvanized steel yeeb nkab. Galvanizing tuaj yeem ua rau muaj kev tiv thaiv corrosion ntawm cov kav hlau thiab ua rau lawv lub neej ua haujlwm ntev. Galvanized yeeb nkab yog dav siv. Ntxiv rau qhov siv los ua cov kav dej xa mus rau dej, roj, roj thiab lwm yam dej uas tsis tshua muaj siab, nws kuj tseem siv tau los ua cov kav dej zoo thiab cov roj xa hluav taws xob hauv kev lag luam roj av, tshwj xeeb tshaj yog nyob rau hauv offshore roj teb, roj rhaub, condensate txias. thiab cov thee distillation roj ntxuav exchanger ntawm cov khoom siv coking, trestle yeeb nkab pawg, txhawb thav duab yeeb nkab ntawm kuv qhov, thiab lwm yam. Kub dip galvanized yeeb nkab yog ua kom molten hlau react nrog hlau matrix los tsim alloy txheej, thiaj li ua ke cov matrix thiab txheej. . Kub dip galvanizing yog kom pickle cov yeeb nkab steel ua ntej. Txhawm rau tshem tawm cov hlau oxide nyob rau saum npoo ntawm cov yeeb nkab steel, tom qab pickling, nws yog ntxuav nyob rau hauv ammonium chloride los yog zinc chloride aqueous tov los yog ammonium chloride thiab zinc chloride tov aqueous tov tank, thiab ces xa mus rau lub kub dip galvanizing tank. Kub dip galvanizing muaj qhov zoo ntawm cov txheej txheej, muaj zog adhesion thiab lub neej ua haujlwm ntev. Lub matrix ntawm kub-dip galvanized steel yeeb nkab muaj complex lub cev thiab tshuaj lom neeg cov tshuaj tiv thaiv nrog molten plating tov los tsim ib tug corrosion-resistant zinc ferroalloy txheej nrog compact qauv. Cov txheej txheej hlau yog kev sib xyaw nrog cov zinc txheej ntshiab thiab cov yeeb nkab steel matrix, yog li nws muaj zog corrosion kuj. Cov yeeb nkab txias galvanized yog electro galvanized. Tus nqi ntawm galvanized yog tsawg heev, tsuas yog 10-50g / m2. Nws qhov kev tiv thaiv corrosion yog qhov sib txawv ntawm cov yeeb nkab kub-dip galvanized. Txhawm rau kom ntseeg tau qhov zoo, feem ntau cov kav dej galvanized tsis tu ncua tsis siv electro galvanizing (txias plating). Tsuas yog cov tuam txhab me me nrog cov nplai me me thiab cov khoom qub siv electro galvanizing, tau kawg, lawv cov nqi kuj pheej yig. Lub Tsev Haujlwm Saib Xyuas Kev Tsim Kho tau tshaj tawm tias cov kav dej txias galvanized nrog cov cuab yeej rov qab yuav tsum raug tshem tawm thiab yuav tsum tsis txhob siv los ua cov kav dej thiab roj. galvanized txheej ntawm txias galvanized steel yeeb nkab yog txheej txheej electroplating, thiab zinc txheej yog sib cais los ntawm cov yeeb nkab steel substrate. Cov zinc txheej yog nyias, thiab cov zinc txheej tsuas yog txuas nrog cov yeeb nkab steel matrix, uas yooj yim rau poob. Yog li ntawd, nws cov corrosion kuj tsis zoo. Hauv cov tsev tshiab, nws yog txwv tsis pub siv cov kav dej txias galvanized ua cov kav dej.
Nominal phab ntsa thickness (mm): 2.0, 2.5, 2.8, 3.2, 3.5, 3.8, 4.0, 4.5.
Coefficient tsis muaj (c): 1.064, 1.051, 1.045, 1.040, 1.036, 1.034, 1.032, 1.028.
Lus Cim: Cov cuab yeej cuab tam ntawm cov hlau yog ib qho tseem ceeb ntsuas los xyuas kom meej qhov kev pab cuam zaum kawg (cov cuab yeej cuab tam) ntawm cov hlau, uas nyob ntawm cov tshuaj muaj pes tsawg leeg thiab kev kho cua sov ntawm cov hlau. Nyob rau hauv cov txheej txheem steel yeeb nkab, raws li cov kev pabcuam sib txawv, cov khoom siv tensile (lub zog tensile, yield zog los yog yield point, elongation), hardness thiab toughness indexes, raws li zoo raws li lub siab thiab tsis kub khoom yuav tsum tau los ntawm cov neeg siv.
Qib steel: q215a; Q215B; q235a; ua. q235 ib.
Ntsuas tus nqi / MPA: d10.2-168.3mm yog 3Mpa; D177.8-323.9mm yog 5MPa
National standard thiab dimension standard ntawm galvanized yeeb nkab
GB / t3091-2015 welded steel yeeb nkab rau kev thauj mus los tsis tshua muaj siab
Ncaj seam welded steel yeeb nkab (GB / t13793-2016)
GB / t21835-2008 welded steel yeeb nkab qhov ntev thiab qhov hnyav ntawm ib chav tsev ntev
Kev siv cov yeeb nkab galvanized yog tias cov yeeb nkab hlau siv rau cov roj thiab cua sov kuj yog cov yeeb nkab galvanized. Raws li cov yeeb nkab dej, cov yeeb nkab galvanized tsim cov xeb ntau hauv cov yeeb nkab tom qab siv ntau xyoo. Cov dej daj tsis yog tsuas yog ua rau cov khoom tsis huv, tab sis kuj sib xyaw nrog cov kab mob uas ua rau ntawm cov phab ntsa tsis zoo. Corrosion ua rau cov ntsiab lus siab ntawm cov hlau hnyav hauv dej thiab ua rau muaj kev phom sij rau tib neeg kev noj qab haus huv.
Cov txheej txheem ntws yog raws li nram no: lub raj dub - alkali ntxuav - dej ntxuav - acid pickling - yaug nrog dej huv - Leaching additives - ziab - kub dip galvanizing - Sab nraud tshuab - sab hauv tshuab - cua txias - dej txias - passivation - dej yaug - Kev tshuaj xyuas - qhov hnyav - warehousing.
1. Hom thiab tshuaj muaj pes tsawg leeg
Qib thiab tshuaj muaj pes tsawg leeg ntawm cov hlau rau galvanized steel yeeb nkab yuav tsum ua raws li qib thiab tshuaj muaj pes tsawg leeg ntawm cov hlau rau cov yeeb nkab dub tau teev tseg hauv GB / t3091.
2. Txoj kev tsim khoom
Txoj kev tsim cov yeeb nkab dub (qhov cub vuam lossis hluav taws xob vuam) yuav tsum raug xaiv los ntawm cov chaw tsim khoom. Kub dip galvanizing txoj kev yuav tsum tau saws rau galvanizing.
3. Xov thiab yeeb nkab sib txuas
(a) Rau galvanized steel kav xa nrog threads, cov xov yuav tsum tau tig tom qab galvanizing. Cov xov yuav tsum ua raws li Yb 822.
(b) Cov yeeb nkab steel yuav tsum ua raws li Yb 238; Malleable cam khwb cia hlau yeeb nkab txuas yuav tsum ua raws li Yb 230.
4. Cov khoom siv kho tshuab cov khoom siv ntawm cov yeeb nkab steel ua ntej galvanizing yuav tsum ua raws li cov kev cai ntawm GB 3091.
5. Uniformity ntawm galvanized txheej galvanized steel kav yuav tsum tau sim rau uniformity ntawm galvanized txheej. Cov qauv yeeb nkab steel yuav tsum tsis tu ncua rau hauv cov tshuaj tooj liab sulfate rau 5 zaug thiab yuav tsum tsis txhob tig liab (tooj liab plating xim).
6. Kev ntsuas qhov txias txias: galvanized steel yeeb nkab nrog nominal txoj kab uas hla tsis ntau tshaj 50 hli yuav tsum raug rau kev ntsuas txias txias. Lub kaum sab xis yog 90 °, thiab lub vojvoog khoov yog 8 npaug ntawm txoj kab uas hla. Thaum lub sij hawm kuaj tsis muaj muab tub lim, qhov vuam ntawm cov qauv yuav tsum muab tso rau sab nraud los yog sab sauv ntawm txoj kev khoov. Tom qab kev sim, cov qauv yuav tsum tsis muaj kab nrib pleb thiab spalling ntawm zinc txheej.
7. Hydrostatic test qhov kev ntsuam xyuas hydrostatic yuav tsum tau ua nyob rau hauv cov yeeb nkab dub, los yog eddy tam sim no flaw detection yuav siv tau es tsis txhob ntawm hydrostatic test. Kev ntsuas siab lossis qhov loj ntawm qhov piv txwv piv rau eddy tam sim no qhov tsis txaus ntseeg yuav tsum ua raws li cov kev cai ntawm GB 3092. Cov cuab yeej cuab tam ntawm cov hlau yog ib qho tseem ceeb Performance index los xyuas kom meej qhov kev pab cuam zaum kawg (cov cuab yeej cuab tam) ntawm cov hlau,
① Tensile lub zog (σ b): lub siab tshaj plaws quab yuam (FB) yug los ntawm cov qauv thaum lub sij hawm nro, muab faib los ntawm cov thawj cross-sectional cheeb tsam (li) ntawm cov qauv ((σ), hu ua tensile zog (σ b), nyob rau hauv N / mm2 (MPA). Nws sawv cev rau lub peev xwm siab tshaj plaws ntawm cov ntaub ntawv hlau los tiv thaiv kev ua tsis tiav hauv qhov nro. Qhov twg: FB - qhov siab tshaj plaws quab yuam los ntawm tus qauv thaum nws tawg, n (Newton); Yog li -- thawj qhov chaw hla ntu ntawm cov qauv, mm2.
② Yield point (σ s): rau cov khoom siv hlau nrog qhov tshwm sim tshwm sim, qhov kev ntxhov siab thaum cov qauv tuaj yeem txuas ntxiv mus ntxiv yam tsis tau nce (ua kom tsis tu ncua) qhov kev ntxhov siab thaum lub sij hawm tensile txheej txheem, uas yog hu ua yield point. Yog tias qhov kev ntxhov siab txo qis, cov ntsiab lus sab saud thiab qis dua yuav tsum tau paub qhov txawv. Chav tsev ntawm qhov taw tes tawm yog n / mm2 (MPA). Upper yield point (σ Su): qhov siab tshaj plaws kev ntxhov siab ua ntej qhov kev ntxhov siab ntawm cov qauv txo qis thawj zaug; Lower yield point (σ SL): qhov tsawg kawg nkaus kev ntxhov siab nyob rau hauv lub yield theem thaum pib instantaneous nyhuv yog tsis xam. Qhov twg: FS - yield stress (constant) ntawm tus qauv thaum lub sij hawm nro, n (Newton) yog li - thawj cross-sectional cheeb tsam ntawm tus qauv, mm2.
③ Elongation tom qab tawg: ( σ) Hauv qhov kev sim tensile, qhov feem pua ntawm qhov ntev tau nce los ntawm qhov ntsuas qhov ntev ntawm tus qauv tom qab tawg mus rau qhov ntsuas qhov ntev yog hu ua elongation. nrog σ nthuav tawm hauv%. Qhov twg: L1 - ntsuas qhov ntev tom qab ua qauv tawg, hli; L0 - qhov ntsuas qhov ntev ntawm tus qauv, mm.
④ Kev txo qis ntawm cheeb tsam: (ψ) Hauv qhov kev sim tensile, qhov feem pua ntawm qhov kev txo qis tshaj plaws ntawm qhov chaw hla ntawm qhov txo txoj kab uas hla thiab qhov chaw seem ntawm qhov qub tom qab cov qauv tawg yog hu ua qhov txo qis. nrog ψ Qhia hauv%. Qhov twg: S0 - thawj ntu ntu ntu ntawm cov qauv, mm2; S1 - qhov tsawg kawg nkaus ntu ntu ntawm qhov txo txoj kab uas hla tom qab tus qauv tawg, mm2.
⑤ Hardness Performance index: lub peev xwm ntawm cov ntaub ntawv hlau los tiv thaiv qhov chaw ntawm cov khoom tawv yog hu ua hardness. Raws li cov kev sim sib txawv thiab daim ntawv thov, qhov nyuaj tuaj yeem muab faib ua Brinell hardness, Rockwell hardness, Vickers hardness, shore hardness, microhardness thiab kub hardness. Brinell, Rockwell thiab Vickers hardness feem ntau yog siv rau cov kav dej.
Brinell hardness (HB): nias lub pob steel lossis cemented carbide pob nrog ib txoj kab uas hla mus rau hauv cov qauv saum npoo nrog lub zog ntsuas (f), tshem tawm qhov kev xeem quab yuam tom qab lub sijhawm tuav, thiab ntsuas qhov indentation txoj kab uas hla (L) ntawm tus qauv nto. Brinell hardness naj npawb yog cov quotient tau los ntawm kev faib cov kev xeem quab yuam los ntawm lub kheej kheej nto ntawm lub indentation. Qhia hauv HBS (steel ball), chav tsev: n / mm2 (MPA).
(1) Cov pa roj carbon; Qhov siab dua cov ntsiab lus carbon, qhov siab dua qhov hardness ntawm steel, tab sis qhov phem nws cov plasticity thiab toughness
(2) Sulfur; Nws yog ib qho teeb meem impurity nyob rau hauv steel. Hlau nrog cov ntsiab lus siab sulfur yog ib qho yooj yim rau embrittle thaum lub sij hawm ua haujlwm siab ntawm qhov kub thiab txias, uas feem ntau hu ua thermal embrittlement
(3) Phosphorus; Nws tuaj yeem txo cov plasticity thiab toughness ntawm cov hlau, tshwj xeeb tshaj yog nyob rau qhov kub thiab txias. Qhov tshwm sim no hu ua txias brittleness. Nyob rau hauv high-zoo hlau, sulfur thiab phosphorus yuav tsum tau nruj me ntsis tswj. Ntawm qhov tod tes, cov hlau tsis tshua muaj hlau muaj cov sulfur thiab phosphorus siab, uas tuaj yeem ua kom yooj yim txiav, uas yog qhov zoo los txhim kho kev ua haujlwm ntawm cov hlau.
(4) Manganese; Nws tuaj yeem txhim kho lub zog ntawm cov hlau, ua kom tsis muaj zog thiab tshem tawm qhov tsis zoo ntawm cov sulfur, thiab txhim kho cov hardenability ntawm steel. High alloy steel (high manganese steel) nrog cov ntsiab lus siab manganese muaj kev hnav zoo thiab lwm yam khoom siv lub cev
(5) Silicon; Nws tuaj yeem txhim kho hardness ntawm steel, tab sis cov yas thiab toughness txo. Hluav taws xob cov hlau muaj qee qhov nyiaj ntawm silicon, uas tuaj yeem txhim kho cov khoom sib nqus mos
(6) Tungsten; Nws tuaj yeem txhim kho cov xim liab thiab thermal zog ntawm cov hlau, thiab txhim kho qhov hnav tsis kam ntawm cov hlau
(7) Chromium; Nws tuaj yeem txhim kho lub hardenability thiab hnav tsis kam ntawm steel, thiab txhim kho corrosion kuj thiab oxidation tsis kam ntawm hlau
Txhawm rau txhim kho corrosion kuj ntawm cov yeeb nkab steel, cov yeeb nkab steel (dub yeeb nkab) yog galvanized. Galvanized steel yeeb nkab tau muab faib ua kub-dip galvanizing thiab hluav taws xob hlau zinc. Cov txheej kub-dip galvanizing yog tuab thiab cov nqi hluav taws xob galvanizing yog tsawg, yog li muaj galvanized steel yeeb nkab.
