L690, tus qauv raws li ISO 3183 thiab sib npaug rau qib API 5L X100, yog qib siab - qib kab yeeb nkab steel. Nws belongs rau qeb ntawm Ultra-High-Lub zog qis-Alloy (UHSLA) steels. Ua kom tiav qhov tsawg kawg nkaus tawm lub zog (SMYS) ntawm 690 MPa (100 ksi), nws sawv cev rau kev txiav ntug ntawm cov kav dej niaj hnub siv tshuab, ua kom muaj txiaj ntsig zoo thiab kev lag luam kev thauj mus los ntawm cov roj thiab cov nkev.
1. Kev siv thawj zaug thiab kev siv
L690 steel kav yog tsim los rau cov kev thov hauv kev siv hluav taws xob, tshwj xeeb tshaj yog nyob rau hauv ntev - cov kav xa hluav taws xob nyob deb qhov chaw uas muaj kev kub ntxhov thiab kev sib tw ib puag ncig yog tus qauv.
Ntev -Nyob deb siab- Cov kav xa dej siab:Nws txoj kev siv tseem ceeb yog nyob rau sab ntug dej hiav txwv thiab ntug dej hiav txwv cov kav dej uas tsim los thauj cov nkev lossis roj av ntawm qhov kub siab heev. Qhov no tso cai rau kom muaj peev xwm ntau dua yam tsis tau nce cov yeeb nkab txoj kab uas hla.
Arctic thiab Cold Region Pipelines:L690 feem ntau yog tsim los nrog qhov zoo heev uas tsis tshua muaj - qhov kub thiab txias, ua rau nws haum rau cov kav dej hauv arctic, sub-arctic, thiab lwm yam qis- qhov kub thiab txias qhov chaw tiv thaiv kev tawg yog qhov tseem ceeb.
Kev sib sib zog nqus- Dej Offshore Applications:Rau cov kav dej tawm sab nrauv, txo qhov hnyav ntawm cov yeeb nkab yog qhov tseem ceeb. Lub zog siab ntawm L690 tso cai rau cov phab ntsa nyias nyias piv rau cov qib qis, ua rau cov kav dej yooj yim rau nruab rau hauv qhov sib sib zog nqus- dej ib puag ncig thiab txo cov load ntawm kev txhawb nqa.
Bottleneck Tshem Tawm thiab Txhim Kho Lub Peev Xwm:Nws yog siv nyob rau hauv tej yaam num tsom rau kev nce lub peev xwm ntawm cov kav raj xa dej uas twb muaj lawm ("looping") tsis tas yuav nteg cov kab ntxiv ntawm txoj kab uas hla loj dua.
2. Qhov tseem ceeb thiab cov txiaj ntsig zoo
Kev txais yuav L690 steel yeeb nkab muaj qhov tseem ceeb ntawm kev lag luam, kev lag luam, thiab ib puag ncig zoo dua li qis dua -qib steels xws li X70 lossis X80.
Siab Siab thiab Tshaj Tawm:Lub zog yield zog tso cai rau cov kav dej ua haujlwm ntawm qhov siab dua sab hauv, ncaj qha nce qhov ntim ntawm cov roj lossis roj thauj.
Cov khoom siv thiab cov nqi txuag:Rau tib qhov kev ntsuas siab, qhov xav tau ntawm phab ntsa thickness ntawm L690 yog tsawg dua qhov qis dua - qib steels. Qhov no txhais tau tias txuag nyiaj ntau hauv steel tonnage, txo cov khoom siv, kev tsim khoom, vuam, thiab cov nqi tsheb thauj mus los.
Qhov hnyav txo:Qhov txo qis ntawm phab ntsa ua rau cov kav dej sib dua, uas yog qhov txiaj ntsig tseem ceeb rau cov haujlwm sab nrauv uas muaj zog thiab kev teeb tsa tseem ceeb, thiab rau cov phiaj xwm onshore hauv cov av nyuaj.
Txhim kho toughness thiab kev nyab xeeb:Niaj hnub nimno L690 yog tsim los siv cov Thermo siab heev-Mechanical Controlled Processing (TMCP) thiab feem ntau muaj cov acicular ferrite lossis bainitic microstructure. Qhov no muab qhov tshwj xeeb pob txha tawv tawv, ua kom muaj kev nyab xeeb thiab kev ncaj ncees nyob rau hauv kev thauj khoom dynamic thiab nyob rau hauv qis - qhov kub thiab txias.
Enhanced Weldability (rau UHSLA Steel):Thaum vuam yuav tsum tau ua cov txheej txheem nruj, cov tshuaj muaj pes tsawg leeg ntawm L690 yog ua tib zoo sib npaug nrog cov ntsiab lus carbon tsawg thiab tswj Carbon Equivalent (CE). Qhov no ua rau nws weldable yam tsis muaj ntau dhau ua ntej- cua sov, txo qhov kev pheej hmoo ntawm kev kub ntxhov hauv tshav kub -Tebchaws cuam tshuam (HAZ).
3. Txoj Kev Loj Hlob yav tom ntej thiab kev nyiam
Lub neej yav tom ntej rau L690 steel yeeb nkab tau cog lus, uas tau tsav los ntawm lub ntiaj teb lub zog kev lag luam cov kev xav tau hloov zuj zus. Txawm li cas los xij, nws txoj kev saws me nyuam thoob plaws kuj ntsib cov teeb meem.
Txoj Kev Zoo:
Kev loj hlob xav tau rau Natural Gas:Raws li lub ntiaj teb hloov mus rau lub zog huv, qhov kev thov rau cov pa roj carbon monoxide tau nce. L690 tso cai rau kev lag luam thiab kev thauj mus los ntawm cov roj los ntawm thaj chaw deb.
Push rau Economic Efficiency:Lub siab tsis tu ncua los txo cov peev txheej siv nyiaj (CAPEX) hauv mega- cov phiaj xwm yuav txuas ntxiv tsav kev siv cov qib siab dua - qib steels xws li L690 kom ua tiav "ntau dua nrog tsawg dua."
Advancements nyob rau hauv Manufacturing:Kev R & D tsis tu ncua hauv steelmaking, TMCP, thiab cov txheej txheem ua kom txias yuav ntxiv qhov sib xws, toughness, thiab weldability ntawm L690, ua rau nws txhim khu kev qha thiab siv tau yooj yim dua.
Kev loj hlob ntawm cov qib siab dua:Kev tshawb fawb rau qib dhau X100 (piv txwv li, X120) txuas ntxiv mus, nrog L690 ua haujlwm ua lub pob zeb tseem ceeb thev naus laus zis. Cov kev paub tau txais los ntawm L690 ntau lawm ncaj qha pub rau hauv cov khoom tom ntej no - tiam.
Cov kev sib tw thiab cov cheeb tsam tsom xam:
Lim-Raws li Tsim:Yav tom ntej pipelines nyob rau hauv seismic zones los yog permafrost cheeb tsam yuav tsum tau strain peev tshaj tawm los zog. Tsim L690 cov kav dej uas muaj qhov sib txuam siab elongation thiab strain- hardening exponents yog qhov tseem ceeb R & D tsom.
Hydrogen-Induced Cracking (HIC) Resistance:Nrog rau kev lag luam hydrogen uas tshwm sim, tsim L690 qhov sib txawv tiv thaiv HIC rau kev thauj cov hydrogen-natural gas blends lossis hydrogen ntshiab yog qhov tseem ceeb rau yav tom ntej.
Standardization ntawm Vuam txheej txheem:Kev siv dav dav yuav tsum muaj kev txhim kho thiab kev tsim qauv thoob ntiaj teb ntawm kev muaj zog, thaj chaw - pov thawj vuam thiab tsis yog -kev kuaj kev puas tsuaj (NDT) cov txheej txheem los xyuas kom meej kev sib koom ua ke.
Hauv kev xaus,L690 (X100) steel yeeb nkab yog ib qho tseem ceeb ntawm kev siv thev naus laus zis rau cov tiam tom ntej ntawm kev ua haujlwm siab -kev ua tau zoo, tus nqi- zoo, thiab kev nyab xeeb lub zog kav.Nws siv yog teem kom loj hlob raws li kev lag luam tackles ntau nyuaj tej yaam num, tsav los ntawm kev nce qib nyob rau hauv metallurgy thiab ib tug meej kev lag luam thiab ib puag ncig qhov tseem ceeb.
