L485 pipeline steel rau kev lag luam roj av
L485 Pipeline Steel, Nws yog hais txog ib hom hlau uas yuav tsum tau tshwj xeeb siv rau kev xa cov roj, roj thiab lwm yam kav dej.Raws li lub thickness thiab tom qab tsim thiab lwm yam, nws yuav ua tau los ntawm kub dov zeb, steckel zeb los yog phaj zeb, thiab tsim los ntawm kauv vuam los yog UOE ncaj seam welding ntawm loj txoj kab uas hla steel yeeb nkab.
L485 Pipeline Steel, Taw Qhia Rau Lub
Kev thauj mus los ntawm cov kav dej thiab kev tsheb ciav hlau, kev thauj mus los loj, kev thauj mus los hauv dej thiab kev thauj mus los hauv huab cua tau teev tseg raws li tsib hom kev thauj mus los niaj hnub no.Los ntawm thawj cov kav raj xa dej mus txog rau tam sim no, kev tsim cov roj thiab cov kav dej tau ntsib ze li ob puas xyoo ntawm txoj kev loj hlob.Kev tsim khoom thiab kev siv cov raj xa dej tau pib lig hauv Suav teb, thiab tsis muaj cov raj xa hluav taws xob tiag tiag ua ntej xyoo 1985. Txawm li cas los xij, nyob rau xyoo tas los no, kev txhim kho, kev loj hlob thiab kev siv cov raj xa dej hauv Suav teb tau tsim sai heev.Nrog rau kev txhawb nqa ntawm cov kav dej loj xws li cov kav dej sab hnub poob, West-sab hnub tuaj cov kav xa hluav taws xob sab hnub poob thiab cov roj xa hluav taws xob sab hnub poob thib ob-kab kav, kev tsim khoom thiab kev siv ntawm X60, X70 thiab X80 pipeline steel tau ua tiav tiav, thiab cov txiaj ntsig kev tshawb fawb. X100 thiab X120 tau txais.
L485 Pipeline Steel, Cov ntaub so ntswg
L485 Pipeline Steel, Lub Koom Haum cov qauv yog lub hauv paus rau kev txiav txim siab nws cov kev ua tau zoo thiab kev pabcuam nyab xeeb.Tam sim no, pipeline steels tau muab faib ua plaub pawg raws li lawv cov microstructure:
1. Ferritic pearlite pipeline hlau
Lub ferritic pearlite pipeline steel yog cov qauv tsim ntawm cov kav dej steel tsim ua ntej xyoo 1960.X52 thiab pipeline steel nrog qis zog qib yog tag nrho cov ferritic pearlite.Nws cov ntsiab lus tseem ceeb yog carbon thiab manganese, thiab cov ntsiab lus ntawm cov pa roj carbon monoxide (feem ntau, tib yam hauv qab no) yog 0.10% txog 0.20%, thiab cov ntsiab lus manganese yog 1.30% txog 1.70%.Feem ntau siv kub dov lossis kub txheej txheem kev tsim khoom.Thaum xav tau lub zog siab dua, qhov kev txwv siab ntawm cov ntsiab lus carbon yog qhov xav tau, lossis cov kab niobium thiab vanadium ntxiv rau hauv manganese system.Ferritic pearlite pipeline steels feem ntau suav hais tias muaj polygonal ferrite nrog cov nplej loj li ntawm 7μm thiab pearlite nrog ib feem ntawm kwv yees li 30%.Feem ntau ferritic pearlite pipeline steels yog 5LB, X42, X52, X60, X60 thiab X70.
2. Acicular ferrite pipeline hlau
Kev tshawb fawb ntawm acicular ferritic pipeline steel pib thaum xyoo 1960s thiab tau muab tso rau hauv kev lag luam hauv xyoo 1970s.Lub sijhawm ntawd, manganese - niobium system raws li E tsim cov pa roj carbon tsawg.Hauv mn-Mo-Nb microalloy pipeline steel, qhov sib ntxiv ntawm molybdenum tuaj yeem txo qhov kev hloov pauv kub los tiv thaiv polygonal ferrite tsim, txhawb kev hloov pauv ntawm acicular ferrite, thiab txhim kho cov nag lossis daus ntxiv ntawm cov pa roj carbon thiab niobium nitride, txhawm rau ua kom lub zog ntawm cov hlau. thiab txo qhov toughness thiab brittle-transition kub.Qhov no molybdenum alloying tshuab tau nyob rau hauv ntau lawm rau ze li ntawm 40 xyoo.Nyob rau hauv xyoo tas los no, lwm cov cuab yeej kub kub kom tau txais acicular ferrite tau tshwm sim.Nws tuaj yeem tau txais acicular ferrite ntawm qhov kub siab dua los ntawm kev siv cov tshuab niobium alloying siab.Feem ntau acicular ferrite pipeline steels yog X70 thiab X80.
3. Bainite - martensite pipeline steel
Nrog rau txoj kev loj hlob ntawm kev kub siab thiab loj ndlwg ntawm natural gas pipeline steel thiab nrhiav kev txo tus nqi ntawm pipeline tsim, acicular ferrite qauv tsis tau raws li qhov yuav tsum tau.Nyob rau hauv lub xyoo pua 20th, ib hom ntawm ultra-siab zog pipeline steel tau tshwm sim.Hom steel qib yog X100 thiab X120.X100 tau tshaj tawm thawj zaug los ntawm SMI hauv Nyij Pooj xyoo 1988. Tom qab xyoo ntawm kev tshawb fawb thiab kev loj hlob, X100 yeeb nkab tau xub muab tso rau hauv seem kev sim engineering hauv xyoo 2002. ExxonMobil ntawm Tebchaws Meskas tau pib tshawb fawb ntawm X120 pipeline steel hauv 1993, thiab hauv 1996, nws tau koom tes nrog SMI thiab NSC ntawm Nyiv los koom ua ke txhawb txoj kev tshawb fawb ntawm X120.Nyob rau hauv 2004, X120 steel tau muab tso rau thawj zaug nyob rau hauv lub pilot seem ntawm lub raj xa dej.
Hauv kev tsim qauv ntawm bainite-martensitic pipeline steel, qhov zoo tshaj plaws ua ke ntawm carbon - manganese - tooj liab - npib tsib xee - molybdenum - niobium - vanadium - titanium - boron tau raug xaiv.Tus tsim ntawm no alloy ua rau tag nrho siv cov yam ntxwv tseem ceeb ntawm boron nyob rau hauv theem kev hloov dynamics.Qhov sib ntxiv ntawm kab boron (ωB = 0.0005% ~ 0.003%) tuaj yeem pom tseeb inhibit lub nucleation ntawm ferrite ntawm austenite grain ciam thiab ua rau ferrite nkhaus hloov mus rau txoj cai pom tseeb.Txawm ntawm ultra-low carbon (ωC = 0.003%), bainite kev hloov pauv nkhaus yog flattened los ntawm kev txo qis qhov txias txias kawg (& LT; 300 ℃) thiab txhim kho qhov txias txias (> 20 ℃ / s), qis bainite thiab lath martensite qauv kuj tuaj yeem tau txais.Feem ntau bainite-martensite (B -- M) pipeline steels yog X100 thiab X120.
4. Tempered sophorite pipeline hlau
Nrog rau txoj kev loj hlob ntawm tib neeg, cov kav dej steel yuav tsum muaj zog dua thiab tawv.Yog tias cov txheej txheem tswj dov thiab cua txias tsis tuaj yeem ua tau raws li cov kev xav tau no, cov txheej txheem kev kho cua sov ntawm kev nruj quenching thiab tempering tuaj yeem raug coj los ua kom tau raws li cov kev xav tau ntawm cov phab ntsa tuab, siab zog thiab txaus toughness los ntawm kev tsim tempered sorbitite.Hauv cov raj xa dej, qhov no homogenous sortensite, tseem hu ua homogenous martensite, yog ib qho kev koom tes ntawm ultra-siab zog pipeline steel X120.
Tshuaj muaj pes tsawg leeg
L245 Pipeline Steel, Qhov hnyav suav cov mis: [(sab nraud txoj kab uas hla - phab ntsa thickness) * phab ntsa thickness] * 0.02466 = kg / m (qhov hnyav ib meter)
| Chemical muaj pes tsawg leeg (mass feem)…/% | carbon equivalent (CEV) | |||||||||||||||||
| C | Si | Mn | P | S | Nb | V | Ti | Cr | Ni | Cu | N | Mo | B | Als | ||||
| tsawg dua los yog sib npaug |
| tsawg dua los yog sib npaug | ||||||||||||||||
| q345 ua | A | 0.2 | 0.5 | 1.7 | 0.035 ib | 0.035 ib |
|
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| 0.3 | 0.5 | 0.2 | 0.012 ib | 0.1 |
|
| 0.45 ib | |
| B | 0.035 ib | 0.035 ib |
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|
|
|
| |||||||||||
| C | 0.03 ib | 0.03 ib | 0.07 ib | 0.15 | 0.2 |
| 0.015 ib | |||||||||||
| D | 0.18 | 0.03 ib | 0.025 ib |
| ||||||||||||||
| E | 0.025 ib | 0.02 ib |
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| q390 ua | A | 0.2 | 0.5 | 1.7 | 0.035 ib | 0.035 ib | 0.07 ib | 0.2 | 0.2 | 0.3 | 0.5 | 0.2 | 0.015 ib | 0.1 |
|
| 0.46 ib | |
| B | 0.035 ib | 0.035 ib |
|
| ||||||||||||||
| C | 0.03 ib | 0.03 ib |
| 0.015 ib | ||||||||||||||
| D | 0.03 ib | 0.025 ib |
| |||||||||||||||
| E | 0.025 ib | 0.02 ib |
| |||||||||||||||
| q420 ua | A | 0.2 | 0.5 | 1.7 | 0.035 ib | 0.035 ib | 0.07 ib | 0.2 | 0.2 | 0.3 | 0.8 ua | 0.2 | 0.015 ib | 0.2 |
|
| 0.48 ib | |
| B | 0.035 ib | 0.035 ib |
| 0.015 ib | ||||||||||||||
| C | 0.03 ib | 0.03 ib |
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| D | 0.03 ib | 0.025 ib |
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| E | 25 | 0.02 ib |
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| q450 ua | C | 0.2 | 0.6 | 1.8 | 0.03 ib | 0.03 ib | 0.11 | 0.2 | 0.2 | 0.3 | 0.8 ua | 0.2 | 0.015 ib | 0.2 | 0.005 ib | 0.015 ib | 0.53 ib | |
| D | 0.03 ib | 0.025 ib | ||||||||||||||||
| E | 0.025 ib | 0.02 ib | ||||||||||||||||
Khoom Qhia
