Lub raj xa dej yog ib hom yeeb nkab steel siv rau kev thauj mus los ntawm cov roj, roj av, roj av, thiab dej. Cov kav hlau hlau feem ntau yog siv rau hauv thaj chaw uas muaj huab cua hnyav xws li thaj tsam qaum teb, thaj chaw dej khov, suab puam, thiab dej hiav txwv. Cov kab ntev ntev, tsis yooj yim rau kev tswj, thiab muaj cov kev cai nruj thiab cov lus qhia tshwj xeeb. Pipeline steel muaj seamless steel kav thiab welded steel kav nyob ntawm nws txoj kev tsim khoom. Nws yog tsim los ntawm high-strength carbon steel thiab yuav tsum tau pw nyob rau hauv txias, high-sulfur cheeb tsam los yog nyob rau hauv seabed.
Qhov zoo ntawm cov yeeb nkab steel
Cov kab yeeb nkab feem ntau muaj cov khoom siv zoo, xws li phab ntsa thickness, siab zog, siab toughness thiab hnav tsis kam, tab sis nws yuav tsum muaj txoj kab uas hla loj, zoo weldability, tsis kub tsis kam, corrosion kuj (CO2), seawater kuj thiab HIC, SSCC. kev ua tau zoo.
siab zog
Cov kav hlau tsis yog tsuas yog yuav tsum muaj lub zog tensile siab thiab lub zog tawm los, tab sis kuj muab qhov sib piv ntawm {{0}}.85 ~ 0.93.
High cuam tshuam toughness
High cuam tshuam toughness tiv thaiv kev tawg.
Tsawg ductile-txias hloov kub
Cov huab cua hnyav hauv cheeb tsam thiab huab cua xav tau cov raj xa dej kom muaj cov ductility tsawg txaus thiab brittleness hloov kub. Qhov chaw shear ntawm DWTT (poob qhov hnyav tsim kua muag) tau dhau los ua qhov ntsuas tseem ceeb los tiv thaiv kev ua tsis tiav ntawm cov kav dej, thiab nws feem ntau yuav tsum tau hais tias qhov tawg ntawm qhov chaw ntawm cov qauv yuav tsum muaj ntau dua lossis sib npaug li 85% ntawm qhov qis tshaj kev khiav hauj lwm. kub.
Kev tiv thaiv zoo heev rau hydrogen-induced cracking (HIC) thiab sulfide stress corrosion cracking (SSCC)
zoo vuam kev ua tau zoo
Cov qauv rau cov kav dej steel
Tam sim no, cov txheej txheem tseem ceeb rau kev thauj cov roj thiab roj cov kav hlau muaj xws li API SPEC 5L, DNV-OS-F101, ISO 3183 thiab GB / T 9711.
API 5L yog ib qho kev siv dav dav tsim los ntawm cov tuam txhab roj av loj thiab tsuas yog siv rau cov khoom siv yeeb nkab steel thiab tsis npog cov qauv tsim, xaiv lossis kev teeb tsa cov kav dej.
DNV-OS-F101 (Submarine Pipeline System) yog qhov tshwj xeeb tsim los ntawm Det Norske Veritas rau cov kav dej hauv qab hiav txwv. Cov ntsiab lus yog qhov dav, suav nrog kev tsim cov kav dej, cov khoom siv, kev tsim khoom, kev teeb tsa, kev sim, kev ua haujlwm, kev saib xyuas, thiab lwm yam, thiab feem ntau nruj dua API 5L.
ISO 3183 yog lub koom haum tsim qauv thoob ntiaj teb tsim los ntawm kev xa cov roj thiab cov roj xa mus rau cov kav hlau. Cov txheej txheem yog cov lus qhia dav dav thiab nthuav dav, tab sis tsis suav nrog kev tsim cov kav dej, kev teeb tsa, thiab lwm yam.
