LSAW carbon steel yeeb nkab plays lub luag hauj lwm txiav txim siab nyob rau hauv ntev -kab kav dej nyob deb nroog, hla- lub teb chaws cov roj xa cov kab, offshore export pipelines, thiab cov loj loj infrastructure tej yaam num. Thaum nws txoj kev tsim khoom raws li cov phaj tsim thiab submerged arc vuam yog dav lees paub, qhov kawg qhov sib txawv txhim khu kev qha LSAW carbon steel yeeb nkab los ntawm cov qauv welded yeeb nkab yog qhov tob ntawm kev tswj kom zoo thiab kev ua haujlwm pov thawj kos rau hauv lub voj voog ntau lawm. Los ntawm kev tshuaj xyuas cov phaj nyoos mus rau qhov kawg ntawm kev ntsuas hydrostatic, txhua theem ncaj qha cuam tshuam rau kev ntseeg tau ntawm cov qauv, kev ntseeg ruaj khov, thiab ntev - kev pabcuam kev nyab xeeb.
Hauv kev siv siab - siab carbon steel yeeb nkab kev siv, tshwj xeeb tshaj yog rau kev thauj mus los roj thiab roj, cov tswv thiab EPC cov neeg cog lus ntsuas tsis tsuas yog lub zog tsis muaj zog tab sis kuj muaj tus cwj pwm tawg, weld sib xws, qhov ntev ntev, thiab txheej txheej. Yog li ntawd, kev nkag siab txog yuav ua li cas LSAW carbon steel yeeb nkab raug kuaj thiab tshawb xyuas muab kev nkag siab rau vim li cas nws tseem yog ib qho kev daws teeb meem hauv cov phiaj xwm tseem ceeb.
Raw Material Control thiab Plate Qualification
Steel Phaj Chemistry thiab Mechanical Consistency
Qhov zoo ntawm LSAW carbon steel yeeb nkab pib nrog steel phaj xaiv. Tsis zoo li ERW los yog HFW yeeb nkab uas tso siab rau cov kub dov coil, LSAW ntau lawm siv cov phaj hnyav, feem ntau yog tsim los ntawm kev tswj dov lossis thermo- kev tswj cov tshuab ua haujlwm. Cov tshuaj muaj pes tsawg leeg yuav tsum ua tib zoo sib npaug kom ua tiav qhov yuav tsum tau muaj zog thaum tuav cov pa roj carbon tsawg sib npaug los txhim kho weldability.
Cov pa roj carbon ntau dhau los yog cov ntsiab lus alloying tuaj yeem ua rau muaj zog hauv thaj chaw tshav kub, uas tuaj yeem txo cov pob txha toughness. Yog li, daim ntawv tsim nyog suav nrog kev tshuaj xyuas tshuaj, kev ntsuas tensile, kev ntsuam xyuas cuam tshuam, thiab qee zaum poob qhov ntsuas qhov hnyav nyob ntawm qhov project specification. Rau cov kav xa hluav taws xob ua haujlwm nyob rau hauv qhov chaw kub qis, cuam tshuam kev ua haujlwm ntawm sub- xoom kub dhau los ua qhov tseem ceeb tshwj xeeb.
Cov lus hauv qab no qhia txog cov tshuaj lom neeg muaj pes tsawg leeg tswj kev sib txawv rau cov qib API uas siv hauv LSAW carbon steel yeeb nkab.
| Qib | C Max % | Mn% | P Max % | S Max % | Daim ntawv thov |
|---|---|---|---|---|---|
| API 5L X52 | 0.22 | 1.40 | 0.030 | 0.030 | Cov roj sib sau ua ke |
| API 5L X60 | 0.20 | 1.60 | 0.030 | 0.030 | Gas kis tau tus mob |
| API 5L X65 | 0.18 | 1.70 | 0.030 | 0.030 | Siab -siab lub cev kab |
| API 5L X70 | 0.17 | 1.80 | 0.030 | 0.030 | Ntev -kab kav dej |
Cov txiaj ntsig no yuav txawv nyob ntawm kev xyaum zeb thiab cov kev xav tau tshwj xeeb, tab sis kev tswj cov tshuaj nruj yog qhov tseem ceeb rau kev ua kom cov weld zoo thiab tawg tsis kam.
Phaj Ultrasonic kuaj ua ntej tsim
Ua ntej kev tsim, cov hlau phaj feem ntau raug kuaj xyuas ultrasonic los kuaj xyuas cov lamination tsis xws luag lossis kev cuam tshuam sab hauv. Vim tias LSAW carbon steel yeeb nkab feem ntau siv rau hauv qhov chaw siab, cov phaj sab hauv tsis tuaj yeem zam tau. Ua ntej- kev tshuaj ntsuam xyuas kom ntseeg tau tias tsuas yog cov khoom tsim nyog nkag mus rau theem tsim thiab vuam, txo qhov kev pheej hmoo ntawm kev tsis lees paub nqes.
Welding Process Control thiab Seam Integrity
Submerged Arc Vuam Parameters
Lub longitudinal weld seam yog cov txheej txheem pob txha ntawmLSAW carbon steel yeeb nkab. Vuam feem ntau yog ua nyob rau hauv ob kis, sab hauv thiab sab nraud, siv ntau -wire submerged arc vuam. Thaum tshav kub kub input, mus txawv tebchaws ceev, tam sim no, thiab voltage yuav tsum tau ua tib zoo tswj kom ua tiav kev nkag mus rau tag nrho yam tsis muaj kev loj hlob ntau dhau.
Kev siv hluav taws xob tsis zoo tuaj yeem ua rau softening lossis hardening nyob rau hauv lub tshav kub cuam tshuam cheeb tsam. Txhawm rau zam qhov no, cov txheej txheem vuam cov ntaub ntawv tsim nyog tau tsim thiab siv tau ua ntej pib tsim khoom loj. Welding consumables raug xaiv kom phim lub hauv paus hlau lub zog thiab toughness yuav tsum tau.
Tsis yog-Kev kuaj xyuas kev puas tsuaj thiab kev ntsuas hydrostatic
Tom qab welding, txhua LSAW carbon steel yeeb nkab tau txais kev pom zoo uas tsis yog -kev tshuaj xyuas kev puas tsuaj. Kev kuaj ultrasonic feem ntau yog siv los txheeb xyuas qhov kev nkag mus ntawm vuam thiab kuaj pom qhov tsis zoo. Kev tshuaj xyuas hluav taws xob tuaj yeem ua tau raws li qhov yuav tsum tau ua. Tsis tas li ntawd, kev ntsuam xyuas cov khoom sib nqus tuaj yeem txheeb xyuas cov kab nrib pleb ntawm qhov sib txuas.
Kev ntsuam xyuas hydrostatic yog ua los xyuas kom meej tias lub siab tsis kam. Cov yeeb nkab yog ntim nrog dej thiab pressurized mus rau ib theem siab tshaj nws tsim kev khiav hauj lwm siab. Ib qho dej los yog deformation ua rau tsis lees paub. Cov txheej txheem no muab kev lees paub tias cov yeeb nkab tuaj yeem tiv taus kev pabcuam yam tsis muaj kev ua haujlwm.
Cov lus hauv qab no qhia txog cov kev tshuaj xyuas uas siv rau LSAW carbon steel yeeb nkab.
| Txoj kev tshuaj xyuas | Chaw soj ntsuam | Lub hom phiaj |
|---|---|---|
| Kev kuaj Ultrasonic | Weld seam thiab phaj lub cev | Txheeb xyuas qhov tsis zoo ntawm sab hauv |
| Kev kuaj hluav taws xob | Weld seam | Tshawb xyuas weld nkag |
| Sib Nqus Particle Test | Nto thiab weld cheeb tsam | Txheeb xyuas cov kab nrib pleb |
| Hydrostatic Test | Tag nrho lub cev | Paub meej tias kev ua haujlwm siab |
| Dimensional soj ntsuam | OD, WT, ntev | Tshawb xyuas kev ua raws cai |
Kev sim ua kom paub tseeb tias LSAW carbon steel yeeb nkab ua tau raws li qhov xav tau ntawm txhua yam thiab geometric ua ntej xa khoom.
Fracture Toughness thiab Crack Propagation Resistance
Impact Testing thiab DWTT Performance
Hauv siab - cov kav xa hluav taws xob siab, kev coj tus cwj pwm tawg yog qhov kev txiav txim siab tsim nyog. LSAW carbon steel yeeb nkab siv rau hauv cov tshuab no yuav tsum ua kom pom qhov cuam tshuam txaus los tiv thaiv kev tawg tawg. Charpy V- qhov ntsuas qhov cuam tshuam qhov ntsuas ntsuas nqus lub zog ntawm qhov ntsuas kub, thaum ntsuas qhov ntsuas qhov hnyav ntsuas ntsuas qhov tawg tawm tsam.
High toughness yog ib qho tseem ceeb tshwj xeeb tshaj yog nyob rau hauv cov cheeb tsam txias los yog siab strain puag ncig. Cov txheej txheem tsim cov phaj niaj hnub tso cai rau LSAW carbon steel yeeb nkab kom ua tau zoo heev toughness yam tsis muaj kev txi lub zog. Qhov nyiaj tshuav no yog qhov tseem ceeb rau kev nyab xeeb ntev - kis kab mob.
Weld Seam Toughness Matching
Lwm qhov kev txiav txim siab tseem ceeb yog kev sib txuam weld seam toughness rau cov khoom siv hlau. Yog tias weld hlau toughness tsawg dua li cov khoom siv hauv paus, qhov pib tawg tuaj yeem tshwm sim ntawm seam. Yog li ntawd, welding consumables thiab parameters raug xaiv los xyuas kom meej mechanical compatibility.
Txheej Compatibility thiab Ntev -Lub Sij Hawm Durability
LSAW carbon steel yeeb nkab feem ntau siv nyob rau hauv faus thiab offshore ib puag ncig uas yuav tsum tau tiv thaiv corrosion. Cov txheej txheej sab nraud xws li peb- txheej polyethylene thiab fusion bonded epoxy yog siv tom qab kev npaj nto. Cov ntaub ntawv sab hauv kuj tseem siv tau rau hauv cov kav dej lossis cov kav dej tshuaj lom neeg.
Deg huv si, thauj tog rau nkoj profile, thiab seem stability cuam tshuam txheej adhesion. Vim tias cov kav dej LSAW muaj cov phab ntsa tuab thiab ruaj khov geometry, lawv muab cov substrate zoo heev rau daim ntawv thov txheej txheej. Kev xaiv txheej txheej zoo ua ke nrog kev tiv thaiv cathodic txuas ntxiv kev pabcuam lub neej zoo.
Xaus
Los ntawm cov ntawv pov thawj raw khoom mus rau qhov kawg ntawm kev kuaj hydrostatic, kev ntseeg siab ntawm LSAW carbon steel yeeb nkab yog tsim los ntawm kev tswj xyuas nruj thiab kev ua haujlwm zoo. Tshuaj muaj pes tsawg leeg tswj xyuas kom weldability thiab toughness. Advanced submerged arc vuam guarantees seam kev ncaj ncees. Tsis yog -kev kuaj xyuas kev puas tsuaj thiab kev ntsuas siab paub meej txog kev nyab xeeb ntawm cov qauv. Kev ntsuam xyuas cuam tshuam thiab tawg tiv thaiv kev ua tsis tiav hauv qhov xav tau ib puag ncig.
Rau cov tswv kav dej, EPC cov neeg cog lus, thiab cov kws tsim qauv, xaiv LSAW carbon steel yeeb nkab txhais tau tias xaiv cov khoom uas nws qhov kev ua tau zoo tau raug lees paub ntawm txhua theem ntawm kev tsim khoom. Hauv kev siv roj, roj, dej, thiab cov khoom siv tseem ceeb, cov ntawv pov thawj no tsis yog xaiv tau tab sis tseem ceeb. Raws li cov pa roj carbon steel yeeb nkab txuas ntxiv ua haujlwm tseem ceeb ntawm cov txheej txheem thoob ntiaj teb, LSAW thev naus laus zis tseem yog ib qho ntawm kev ntseeg siab tshaj plaws rau cov haujlwm uas xav tau lub zog, kev nyab xeeb, thiab ntev - lub sijhawm ua haujlwm ruaj khov.
