Carbon steel kav siv nyob rau hauv industrial pipelines thiab structural systems yuav tsum tau raws li nruj mechanical kev ua tau zoo. Ntawm cov hom siv dav tshaj plaws yog Cov Hluav Taws Xob Hluav Taws Xob Welded kav, Longitudinal Submerged Arc Welded kav, thiab Kauv Submerged Arc Welded kav. Txhua txoj kev tsim khoom cuam tshuam qhov kawg ntawm cov khoom siv ntawm cov yeeb nkab, suav nrog lub zog tawm los, lub zog tensile, cuam tshuam toughness, thiab weld seam kev ntseeg tau.
Kev nkag siab txog cov yam ntxwv ntawm kev ua haujlwm ntawm cov kav dej no pab cov engineers txiav txim siab seb cov khoom twg yog qhov tsim nyog tshaj plaws rau cov ntawv thov tshwj xeeb xws li cov kav dej thiab cov kav dej, kev tsim kho, kev sib txuas ntawm cov dej, thiab cov khoom siv siab -cov kabmob. Txawm hais tias ERW cov kav dej feem ntau yog siv rau hauv cov kav dej me me mus rau nruab nrab, lawv cov khoom siv kho tshuab tuaj yeem sib piv rau lwm yam welded yeeb nkab hom thaum ua raws li kev tsim khoom niaj hnub thiab cov qauv tswj kom zoo.
Mechanical Properties ntawm ERWCarbon Steel Pipes
Yield Strength thiab Tensile Strength
Kev ua tau zoo ntawm ERW carbon steel kav feem ntau txiav txim siab los ntawm cov tshuaj muaj pes tsawg leeg ntawm cov hlau sawb thiab cov txheej txheem kho cua sov siv thaum tsim khoom. Cov qib khoom siv feem ntau suav nrog API pipeline steels thiab cov qauv carbon steels uas muab lub zog sib npaug thiab ductility.
Yield zog sawv cev rau theem kev ntxhov siab uas pib deformation mus tas li, thaum lub zog tensile hais txog qhov siab tshaj plaws ntawm cov khoom siv tuaj yeem tiv taus ua ntej tsis ua haujlwm. Piv txwv li, cov khoom siv hauv cov kav dej xws li API 5L Qib B thiab X52 tau siv dav hauv ERW yeeb nkab ntau lawm vim tias lawv muab lub zog txaus rau cov kav dej xa mus thaum tuav cov khoom zoo.
Thaum lub sij hawm tsim khoom, cov hlau sawb maj mam tsim rau hauv cov duab cylindrical ua ntej siab - zaus vuam tsim cov seam longitudinal. Vim hais tias cov txheej txheem vuam tsis siv cov hlau muab tub lim thiab ua kom muaj cua sov tsawg heev - thaj chaw cuam tshuam, cov khoom siv ntawm cov vuam seam tuaj yeem ua kom zoo sib xws ntawm cov hlau puag thaum siv cov kev tswj kom raug.
Cov cuab yeej cuab tam yam khoom siv rau cov khoom siv ERW cov yeeb nkab feem ntau tau sau tseg hauv cov lus hauv qab no.
| Khoom Qib | Yield zog MPa | Tensile zog MPa | Tej kev siv |
|---|---|---|---|
| ASTM A53 Gr.B | Ntau dua lossis sib npaug li 240 | Ntau dua lossis sib npaug li 415 | Cov qauv thiab cov kav dej |
| API 5L Gr.B | Ntau dua lossis sib npaug li 245 | Ntau dua lossis sib npaug li 415 | Roj thiab roj tsheb thauj mus los |
| API 5L X52 | Ntau dua lossis sib npaug rau 360 | Ntau dua lossis sib npaug rau 460 | Nruab nrab siab pipelines |
| API 5L X65 | Ntau dua lossis sib npaug li 450 | Ntau dua lossis sib npaug li 535 | High zog kis pipelines |
Cov yam ntxwv ntawm lub zog no tso cai rau ERW cov kav dej ua kom muaj kev ntseeg siab hauv ntau lub tshuab ua haujlwm uas muaj lub siab nruab nrab thiab cov khoom siv tshuab.
Impact Toughness thiab Ductility
Impact toughness piav txog lub peev xwm ntawm cov khoom siv los nqus lub zog thaum lub sijhawm thauj khoom tam sim ntawd, tshwj xeeb tshaj yog nyob rau qhov kub thiab txias. Cov khoom siv roj carbon steel feem ntau yuav tsum tau ua kom dhau Charpy V-cov kev ntsuas cuam tshuam los xyuas kom meej tias lawv tsis kam ua kom tawg.
Hauv ERW cov kav dej, qhov kev ua tau zoo nyob ntawm lub hauv paus steel zoo thiab kev tswj hwm ntawm cov khoom siv hluav taws xob vuam. High- zaus vuam ua rau lub tshav kub nqaim- thaj chaw cuam tshuam uas tuaj yeem tswj hwm cov qauv zoo yog tias cov cua txias tswj tau zoo. Ntau cov kav dej ERW siv hauv kev tsim cov kav dej yog li ua tau raws li cov qauv kev xav tau teev tseg hauv cov qauv thoob ntiaj teb xws li ASTM A53 thiab EN cov qauv kav dej.
Ntxiv rau qhov cuam tshuam kev ua tau zoo, ductility ntsuas los ntawm kev ntsuas elongation kom ntseeg tau tias cov yeeb nkab tuaj yeem tiv taus kev khoov thiab deformation thaum lub sijhawm teeb tsa yam tsis muaj kev tawg. Niaj hnub nimno ERW kav dej feem ntau ua tiav qhov txiaj ntsig ntawm 20 feem pua thiab 30 feem pua nyob ntawm cov khoom qib.
Weld Seam Zoo thiab Kev Tswj Xyuas Kev Ua Haujlwm
High Frequency Weld Integrity
Weld seam yog ib qho tseem ceeb tshaj plaws uas cuam tshuam rau kev ua haujlwm ntawm ERW kav dej. Nyob rau hauv siab - zaus vuam, hluav taws xob tam sim no concentrates raws cov npoo ntawm cov hlau tsim, tsim kom muaj cua sov uas tso cai rau cov npoo yuav tsum tau forged ua ke nyob rau hauv siab.
Vim tias cov txheej txheem no tshwm sim tsis muaj cov hlau muab tub lim, cov hlau welded feem ntau yog cov khoom siv hauv paus nws tus kheej. Qhov no tsim ib homogeneous sib koom ua ke thaum vuam tsis xws li kub, siab, thiab kev sib raug zoo yog ua tib zoo tswj.
Niaj hnub nimno ERW cov kab ntau lawm suav nrog ntau qhov kev tshuaj ntsuam xyuas uas ua kom muaj kev ncaj ncees ntawm weld seam. Cov tshuab no feem ntau suav nrog kev kuaj hauv online ultrasonic, kev tshuaj xyuas tam sim no, thiab ntsuas hydrostatic siab. Cov kev tswj xyuas zoo li no tau lees paub tias cov vuam seam ua tau raws li cov kev xav tau ntawm lub zog thiab tsis muaj qhov tsis xws luag.
Thaum tshav kub kub- Cov yam ntxwv ntawm cheeb tsam cuam tshuam
Lub tshav kub- thaj tsam cuam tshuam, feem ntau hu ua HAZ, hais txog thaj tsam ntawm cov hlau hauv paus uas muaj kev hloov pauv thermal thaum lub sij hawm vuam. Hauv ERW cov kav dej HAZ feem ntau nqaim vim tias lub voj voog cua sov luv luv thiab hauv zos.
HAZ nqaim txo qhov kev pheej hmoo ntawm kev loj hlob ntau dhau los yog cov cuab yeej cuab tam degradation. Yog li ntawd, cov neeg kho tshuab lub zog thiab toughness ntawm weld seam cheeb tsam nyob ze rau cov nyob ib ncig ntawm lub hauv paus hlau.
Kev sib piv nrogLSAW thiab SSAW Pipes
Cov yam ntxwv muaj zog thoob plaws Vuam txoj kev
Thaum ERW kav dej muab cov khoom siv txhim khu kev qha rau ntau daim ntawv thov, cov kav dej loj dua feem ntau siv cov kav dej uas tsim los ntawm submerged arc vuam txheej txheem. Ob hom yog LSAW yeeb nkab thiab SSAW yeeb nkab.
LSAW kav yog tsim los ntawm steel phaj thiab welded siv submerged arc vuam raws ib tug ncaj longitudinal seam. Vim tias cov phaj tuab tuaj yeem siv tau, LSAW cov kav dej muaj peev xwm ua tiav lub zog siab heev thiab cov phab ntsa tuab haum rau ntev - nrug siab - cov kav dej siab.
SSAW kav yog tsim los ntawm steel coil tsim rau hauv ib tug kauv zoo ua ntej submerged arc vuam. Lub kauv seam faib kev ntxhov siab raws txoj kev txuas ntev dua, uas tuaj yeem muab cov qauv zoo hauv cov kav dej loj, tshwj xeeb tshaj yog rau kev xa dej thiab kev siv cov qauv.
Mechanical Performance Comparison
Txawm hais tias tag nrho peb hom yeeb nkab tuaj yeem ua tau raws li cov qauv thoob ntiaj teb, lawv cov yam ntxwv ntawm kev ua tau zoo sib txawv vim qhov sib txawv ntawm txoj kev tsim thiab vuam seam geometry. Cov lus hauv qab no qhia txog cov yam ntxwv ntawm kev ua tau zoo.
| Hom yeeb nkab | Weld Seam Orientation | Muaj Peev Xwm Muaj Peev Xwm | Daim ntawv thov |
|---|---|---|---|
| ERW | Ncaj longitudinal | Nruab nrab mus rau siab zog | Nruab nrab txoj kab uas hla |
| LSAW | Ncaj longitudinal | Siab zog, tuab phab ntsa | Cov roj thiab roj kav ntev ntev |
| SSAW | Kauv weld seam | Lub zog muaj zog zoo | Cov kav dej loj loj |
ERW kav dej feem ntau muab qhov tseeb qhov tseeb thiab zoo ib yam khoom siv rau cov kav dej me me thiab nruab nrab. LSAW cov kav dej muaj peev xwm ua tau zoo dua qub thiab muaj zog ua haujlwm siab, thaum SSAW kav dej tau zoo haum rau cov kev siv txoj kab uas hla loj heev uas cov nqi ua haujlwm tseem ceeb.
Kev xaiv Engineering Considerations
Kev xaiv ntawm cov yeeb nkab hom rau ib qhov project yog nyob ntawm ntau yam engineering xws li cov kav dej txoj kab uas hla, kev khiav hauj lwm siab, mechanical loads, thiab installation ib puag ncig. Rau cov kav dej uas muaj lub siab nruab nrab thiab txoj kab uas hla hauv qab kwv yees li 660 millimeters, ERW kav dej feem ntau sawv cev rau cov kev daws teeb meem zoo tshaj plaws thiab tsim nyog.
Rau cov kav xa hluav taws xob ntev ntev uas xav tau cov phab ntsa tuab heev thiab cov ntaub ntawv muaj zog, LSAW cov kav dej tuaj yeem muab kev ntseeg tau zoo dua. SSAW cov kav dej feem ntau yog siv rau hauv cov kav dej loj loj lossis cov phiaj xwm kev tsim kho uas yuav tsum muaj txoj kab uas hla loj heev.
Xaus
Cov khoom siv tshuab xws li lub zog tawm los, lub zog tensile, cuam tshuam toughness, thiab weld seam kev ncaj ncees yog qhov tseem ceeb hauv kev ntsuas cov pa roj carbon steel yeeb nkab. ERW kav dej muab cov cuab yeej txhim khu kev qha vim muaj kev tswj xyuas siab - cov txheej txheem vuam zaus thiab siab - cov khoom siv hlau zoo. Lawv cov cua sov nqaim- thaj tsam cuam tshuam thiab cov qauv vuam zoo sib xws tso cai rau lawv ua tiav cov qib siab tsim nyog rau ntau yam kev lag luam.
Thaum muab piv nrog LSAW thiab SSAW kav, ERW kav dej tuav ib txoj haujlwm tseem ceeb hauv kev lag luam hauv nruab nrab txoj kab uas hla, muab qhov sib npaug ntawm kev ua haujlwm zoo, qhov tseeb, thiab kev tsim khoom. Kev nkag siab txog qhov sib txawv ntawm qhov kev ua tau zoo no ua rau cov kws tshaj lij xaiv cov yeeb nkab uas tsim nyog tshaj plaws rau kev ua haujlwm tshwj xeeb thiab cov kev xav tau ntawm engineering.
