Hluav taws xob Resistance Welded kav yog cov feem ntau siv welded carbon steel kav nyob rau hauv niaj hnub pipeline engineering thiab structural tsim. Lawv cov khoom siv ntau dhau los ntawm qhov zoo thiab cov yam ntxwv ntawm cov khoom siv raw siv thaum tsim khoom. Tsis zoo li lwm cov yeeb nkab tsim cov txheej txheem uas tso siab rau cov hlau hnyav los yog cov hlau nplaum, ERW cov kav dej feem ntau yog tsim los ntawm kub dov steel coils uas txuas ntxiv tsim thiab welded rau hauv cov kav dej cylindrical. Vim tias txoj kev tsim thiab vuam yog nyob ncaj qha rau ntawm cov khoom ntawm cov hlau sawb, xaiv cov khoom siv raw yog ib kauj ruam tseem ceeb hauv kev ua kom cov yeeb nkab kawg ua tau raws li cov khoom siv, qhov ntev, thiab kev ua haujlwm.
Kev xaiv cov khoom siv raw rau ERW cov kav dej suav nrog ntau qhov kev txiav txim siab suav nrog tshuaj lom neeg muaj pes tsawg leeg, lub zog siv tshuab, weldability, nto zoo, thiab qhov sib xws. Cov neeg tsim khoom siv hlau yuav tsum muab cov coils uas tuaj yeem tiv taus qhov txias txias thaum lub sijhawm ua cov yeeb nkab shaping txheej txheem thaum tseem muab lub zog txaus thiab tawv rau kev ua haujlwm ntawm cov kav dej. Kev nkag siab txog cov yam ntxwv ntawm cov khoom siv raw no pab piav qhia vim li cas ERW cov kav dej tuaj yeem ua tiav ob qho kev tsim khoom thiab kev ua haujlwm txhim khu kev qha hauv ntau daim ntawv thov kev lag luam.
Steel Coil ua cov khoom siv tseem ceeb
Kub Rolled Carbon Steel Coils
Cov khoom siv tseem ceeb tshaj plaws siv hauv ERW yeeb nkab tsim yog kub dov carbon steel kauj. Cov coils no yog tsim nyob rau hauv steel mills los ntawm dov steel slabs ntawm qhov kub thiab txias, uas ua rau ntev strips ntawm steel nrog tswj thickness thiab dav. Daim ntawv coil tso cai rau cov neeg tsim khoom noj cov khoom tsis tu ncua rau hauv cov yeeb nkab ua tshuab, ua rau cov txheej txheem ERW muaj txiaj ntsig zoo rau kev tsim khoom loj.
Kub dov steel coils siv rau ERW yeeb nkab ntau lawm yuav tsum ua raws li cov kev cai nruj hais txog qhov xwm txheej, qhov ntev ntev, thiab cov khoom siv kho tshuab. Cov hlau yuav tsum muaj cov ductility txaus kom tau txais kev khoov tas mus li thiab tsim yam tsis muaj kev tawg. Nyob rau tib lub sijhawm, nws yuav tsum tswj kom muaj zog txaus kom cov yeeb nkab tiav tuaj yeem tiv taus siab thiab cov khoom thauj khoom.
Lub thickness ntawm steel kauj ncaj qha txiav txim siab phab ntsa thickness ntawm cov yeeb nkab kawg, thaum lub dav ntawm cov sawb tswj cov yeeb nkab txoj kab uas hla tom qab tsim. Yog li, kev tswj kom raug ntawm cov kauj qhov ntev yog qhov tseem ceeb los xyuas kom meej tias cov kav dej ERW ua tau raws li qhov yuav tsum tau ua raws li qhov yuav tsum tau ua thiab cov kev txwv ntev.
Chemical Composition Requirements
Cov tshuaj lom neeg muaj pes tsawg leeg ntawm cov hlau kauj ua lub luag haujlwm tseem ceeb hauv kev txiav txim siab qhov kev sib txuas thiab cov khoom siv ntawm ERW kav. Cov pa roj carbon steel siv rau ERW kav dej feem ntau muaj cov qib tswj cov pa roj carbon, manganese, silicon, thiab cov kab hlau rhuav tshem cov ntsiab lus. Cov ntsiab lus no cuam tshuam cov hlau lub zog, hardness, thiab tsis kam rau deformation thaum lub sij hawm tsim thiab vuam.
Cov ntsiab lus carbon yuav tsum tau ua tib zoo tswj vim tias cov pa roj carbon ntau tuaj yeem ua rau muaj zog, tab sis tuaj yeem txo qhov weldability. Manganese feem ntau ntxiv los txhim kho lub zog tensile thiab toughness, thaum silicon yuav siv tau los ua deoxidizing lub caij thaum steelmaking. Ntxiv me me ntawm cov ntsiab lus xws li niobium los yog vanadium kuj tseem siv tau rau hauv qee cov qib pipeline los txhim kho lub zog los ntawm microalloying.
Cov lus hauv qab no qhia txog cov tshuaj muaj pes tsawg leeg rau cov khoom siv carbon steel siv hauv ERW yeeb nkab tsim.
| Khoom Qib | Cov pa roj carbon (%) | Manganese (%) | Silicon (%) | Hom Standard |
|---|---|---|---|---|
| ASTM A53 Gr.B | Tsawg dua lossis sib npaug li 0.30 | Tsawg dua lossis sib npaug li 1.20 | Tsawg dua lossis sib npaug li 0.30 | ASTM A53 |
| API 5L Gr.B | Tsawg dua lossis sib npaug li 0.28 | Tsawg dua lossis sib npaug li 1.20 | Tsawg dua lossis sib npaug li 0.30 | API 5L |
| API 5L X42 | Tsawg dua lossis sib npaug li 0.28 | Tsawg dua lossis sib npaug li 1.30 | Tsawg dua lossis sib npaug li 0.30 | API 5L |
| EN S355J2H | Tsawg dua lossis sib npaug li 0.22 | Tsawg dua lossis sib npaug li 1.60 | Tsawg dua los yog sib npaug li 0.55 | TS EN 10219 |
Cov kev txwv muaj pes tsawg leeg ua kom muaj kev sib npaug ntawm cov neeg kho tshuab lub zog thiab zoo weldability thaum lub sij hawm vuam zaus.
Mechanical Properties ntawm Raw Steel Materials
Lub zog thiab Formability Balance
Nyob rau hauv ERW yeeb nkab ntau lawm, raw steel kauj yuav tsum muaj ib tug sib npaug sib xyaw ntawm lub zog thiab formability. Thaum lub sij hawm tsim cov txheej txheem, lub tiaj tus hlau strip dhau los ntawm ib tug series ntawm rollers uas maj mam ua nws mus rau hauv ib tug puag ncig yeeb nkab. Yog tias cov khoom tawg dhau los yog tawv dhau, cov kab nrib pleb yuav tshwm sim thaum khoov, uas yuav cuam tshuam qhov zoo ntawm cov yeeb nkab.
Ntawm qhov tod tes, yog tias cov khoom muag muag heev, cov yeeb nkab yuav tsis ua tau raws li qhov yuav tsum tau muaj zog cov qauv rau cov raj xa dej lossis cov qauv siv. Yog li ntawd, cov qib steel siv rau ERW kav yog tsim los muab lub zog nruab nrab nrog cov yas deformation zoo.
Mechanical zog xws li yield zog, tensile zog, thiab elongation yog ua tib zoo tswj thaum lub sij hawm steel ntau lawm. Cov khoom no cuam tshuam tsis tsuas yog cov txheej txheem tsim tab sis kuj tseem ua haujlwm ntawm cov yeeb nkab kawg hauv kev ua haujlwm.
Weldability thiab Heat Afected Zone Cwj Pwm
Lwm yam khoom tseem ceeb ntawm cov khoom siv raw siv rau ERW kav dej yog weldability. Thaum lub sij hawm ua haujlwm siab welding txheej txheem, cov npoo ntawm cov hlau sawb yog rhuab sai sai thiab tom qab ntawd forged ua ke los tsim cov weld seam. Tus cwj pwm ntawm cov hlau thaum lub sij hawm cua sov thiab cua txias yog nyob ntawm nws cov tshuaj muaj pes tsawg leeg thiab microstructure.
Hlau nrog zoo weldability yuav tsim ib tug muaj zog thiab zoo weld seam yam tsis muaj zog hardness los yog brittleness nyob rau hauv lub tshav kub cuam tshuam cheeb tsam. Yog tias cov pa roj carbon sib npaug ntawm cov hlau siab dhau lawm, cov vuam seam yuav tsim cov kab nrib pleb lossis txo cov tawv nqaij tom qab txias. Yog li ntawd, ERW yeeb nkab manufacturers feem ntau xaiv steel coils nrog tswj cov pa roj carbon sib npaug qhov tseem ceeb los xyuas kom meej vuam kev ua tau zoo.
Cov lus hauv qab no qhia txog cov khoom siv kho tshuab ntawm ntau qib carbon steel feem ntau siv rau ERW yeeb nkab ntau lawm.
| Khoom Qib | Yield zog (MPa) | Tensile zog (MPa) | Elongation (%) | Cov ntawv thov siv |
|---|---|---|---|---|
| ASTM A53 Gr.B | Ntau dua lossis sib npaug li 240 | Ntau dua lossis sib npaug li 415 | Ntau dua lossis sib npaug li 21 | Kev thauj mus los ntawm cov dej thiab kev siv cov qauv |
| API 5L Gr.B | Ntau dua lossis sib npaug li 245 | Ntau dua lossis sib npaug li 415 | Ntau dua lossis sib npaug 22 | Roj thiab roj pipelines |
| API 5L X52 | Ntau dua lossis sib npaug rau 360 | Ntau dua lossis sib npaug rau 460 | Ntau dua lossis sib npaug li 20 | High zog kis pipelines |
| EN S355J2H | Ntau dua lossis sib npaug rau 355 | 470–630 | Ntau dua lossis sib npaug li 20 | Structure engineering |
Cov cuab yeej cuab tam cov cuab yeej ua kom ntseeg tau tias ERW cov kav dej uas tsim los ntawm cov ntaub ntawv no tuaj yeem ua tau raws li cov qauv kev xav tau.
Cov khoom siv ntxiv siv hauv ERW Pipe Production
Vuam thiab tsim cov ntaub ntawv txheej txheem
Txawm hais tias cov hlau kauj yog cov khoom siv tseem ceeb, lwm cov ntaub ntawv tseem koom nrog hauv ERW kev tsim khoom. Piv txwv li, kev tsim cov roj nplua nyeem tuaj yeem siv los txo kev sib txhuam thaum lub sij hawm shaping. Cov tshuab dej txias yog siv los tswj qhov kub ntawm cov khoom siv vuam thiab tiv thaiv kom tsis txhob muaj cua sov.
Hauv qee cov kab ntau lawm, sab hauv lossis sab nraud weld seam kev kho cua sov tuaj yeem siv los kho cov microstructure thiab txhim kho cov khoom siv ntawm thaj chaw weld. Cov ntaub ntawv txhawb nqa thiab cov txheej txheem no pab xyuas kom meej tias cov yeeb nkab kawg tswj tau zoo ib yam.
Cov ntaub ntawv tiv thaiv nto
Tom qab cov yeeb nkab tau tsim thiab welded, cov ntaub ntawv ntxiv tuaj yeem siv los tiv thaiv cov hlau nto ntawm corrosion. Nyob ntawm daim ntawv thov ib puag ncig, cov kav dej tuaj yeem muab cov txheej txheem xws li cov zeb dub tiav, kub dip galvanizing, fusion bonded epoxy, lossis polyethylene tiv thaiv txheej.
Cov coatings no tsis hloov cov cuab yeej cuab tam ntawm cov yeeb nkab tab sis ua kom nws cov kav ntev hauv qhov chaw hnyav. Rau cov kav dej ua haujlwm hauv av, hauv qab dej, lossis hauv qhov chaw muaj av noo, kev tiv thaiv corrosion yog qhov tseem ceeb rau kev tswj xyuas lub neej ntev.
Xaus
Kev tsim cov kav dej ERW yog nyob ntawm kev xaiv thiab cov khoom zoo ntawm cov khoom siv raw, tshwj xeeb tshaj yog kub dov carbon steel coils. Cov ntaub ntawv no yuav tsum tau ua tib zoo sib xyaw ua ke ntawm cov tshuaj muaj pes tsawg leeg, txhua yam muaj zog, ductility, thiab weldability kom ntseeg tau tias cov yeeb nkab ua tiav thiab kev ua haujlwm zoo vuam zoo.
Los ntawm kev tswj cov khoom ntawm cov khoom siv raw steel thiab siv cov cuab yeej siv vuam siv niaj hnub no, cov chaw tsim khoom muaj peev xwm tsim ERW carbon steel kav uas ua tau raws li cov qauv thoob ntiaj teb rau cov kav dej, cov qauv, thiab kev siv hauv kev lag luam. Raws li kev thov thoob ntiaj teb rau kev txhim khu kev txhim khu kev lag luam txuas ntxiv mus ntxiv, qhov tseem ceeb ntawm cov khoom siv zoo hauv ERW yeeb nkab tsim yuav tseem yog qhov tseem ceeb hauv kev ua kom muaj kev nyab xeeb thiab ua tau zoo ntawm cov yeeb nkab steel.
