Ntawm ib sab
L485:Qhov no yog qhovQhov tsawg kawg nkaus yield zog (SMYS)metric npe. Nws txhais tau hais tias cov yeeb nkab yog tsim los tawm los (pib deform plastically) ntawm qhov tsawg kawg nkaus ntawm 485 Megapascals (MPa). Nyob rau hauv ntau ntau American Petroleum Institute (API) unit system, qhov no sib npaug rauX70.
PSL2:Qhov no sawv rauKhoom Specification Qib 2. Nws yog tus qauv zoo dua nrog cov tshuaj nruj dua, kev siv tshuab, thiab kev sim ntsuas piv rau PSL1.
Kab Yeeb:Qhov no qhia tau hais tias cov khoom tubular yog tsim los thauj cov roj, roj, thiab lwm yam kua dej mus ntev.
Qhov tseem ceeb,L485 PSL2 yog lub siab - lub zog, siab - zoo steel yeeb nkab siv nyob rau hauv xav tau siab - cov ntawv thov cov kav dej.
Cov ncauj lus kom ntxaws txog kev tsim npe
1. L485 / X70 (Lub zog muaj zog)
Specified Yam Tsawg Tshaj Tawm Zog (SMYS): 485 MPa lossis 70,000 psi.Qhov no yog cov cuab yeej tseem ceeb tshaj plaws rau kev tsim cov kav dej. Nws txiav txim siab qhov siab tshaj plaws kev khiav hauj lwm siab (hoop stress) cov yeeb nkab tuaj yeem tiv taus.
Siab-Strength, Tsawg-Alloy (HSLA) Steel:Yuav kom ua tiav qib no lub zog, cov hlau yog "micro-alloyed" steel. Cov khoom me me, cov ntsiab lus meej xws li Niobium (Nb), Vanadium (V), thiab Titanium (Ti) ntxiv. Cov ntsiab lus no tsim cov carbonitride precipitates uas ntxiv dag zog rau cov qauv steel hlau yam tsis muaj kev cuam tshuam rau qhov toughness lossis weldability.
Daim ntawv thov:Lub zog siab tso cai rau kev siv cov phab ntsa ntawm cov yeeb nkab nyias nyias kom thauj tau tib lub siab, ua rau kev txuag nyiaj tseem ceeb ntawm cov khoom siv, vuam, thiab kev thauj mus los.
2. PSL2 (Theem Zoo)
Qhov sib txawv tseem ceeb ntawm PSL1 thiab PSL2 yog nyob rau hauv kev txhim kho kev tswj hwm thiab kev sim. PSL2 txoj haujlwm:
Tighter Chemical Composition:Kev txwv nruj ntawm cov ntsiab lus xws li Carbon, Sulfur, thiab Phosphorus kom ntseeg tau zoo dua weldability thiab tiv thaiv kev tawg.
Siab Toughness Requirements:PSL2 yeeb nkab yuav tsum tau uaCharpy V-Ntch (CVN) Impact Testinglos xyuas kom meej tias nws tuaj yeem nqus tau lub zog thiab tiv thaiv kev puas tsuaj, tshwj xeeb tshaj yog nyob rau hauv qis - qhov kub thiab txias.
Ntxiv Mechanical Testing:suav nrogLos ntawm -Thickness Guided-Bov TestingthiabKev kuaj Hardnesstxhawm rau txheeb xyuas qhov ncaj ncees ntawm cov hlua khi thiab cov cua sov- cuam tshuam cheeb tsam (HAZ).
Stricter Non-Kev Ntsuam Xyuas Kev Puas Tsuaj (NDT):Tag nrho qhov ntev ntawm cov vuam seam yuav tsum raug tshuaj xyuas siv qhov kev kuaj ultrasonic automated (AUT) lossis kuaj hluav taws xob, muab qib siab ntau ntawm kev kuaj pom tsis zoo tshaj qhov chaw- kuaj xyuas feem ntau siv rau PSL1.
Maximum Yield Strength thiab Tensile / Yield Ratio:PSL2 teeb tsa cov kev txwv saum toj kawg nkaus rau lub zog tawm los thiab txhais qhov tsawg kawg nkaus ntawm lub zog tensile rau lub zog tawm los. Qhov no ua kom cov hlau muaj qhov txaus cia ntawm lub zog thiab ductility tshaj nws cov ntsiab lus tawm los.
Cov txheej txheem tseem ceeb ntawm kev tsim khoom
L485 PSL2 kab yeeb nkab feem ntau yog tsim los siv ib qho ntawm ob txheej txheem:
SAWL (Submerged Arc Welded Longitudinal):Lub phaj steel yog dov mus rau hauv lub tog raj kheej thiab ib leeg ntev seam yog welded rau sab hauv thiab sab nraud siv cov txheej txheem submerged arc vuam. Qhov no tshwm sim rau cov kab uas loj dua.
HFW / ERW (High-Frequency Welded / Electric Resistance Welded):Lub pob txha steel yog tsim rau hauv lub tog raj kheej thiab cov seam yog welded los ntawm kev siv siab - zaus hluav taws xob tam sim no thiab siab. Niaj hnub nimno HFW mills tsim cov yeeb nkab nrog zoo piv rau SAWL yeeb nkab.
Hom Tshuaj Chemical Composition (PSL2)
Thaum qhov tseeb chemistry sib txawv los ntawm cov chaw tsim khoom, qhov ntau yam rau L485 / X70 PSL2 yog:
| Element | Yam Ntau Yam (Qhov hnyav %) | Lub Hom Phiaj / Vim Li Cas Limit |
|---|---|---|
| Cov pa roj carbon (C) | 0.05 - 0.10% | Muab lub zog tab sis txwv rau weldability. |
| Manganese (Mn) | 1.50 - 1.70% | Ua kom muaj zog thiab toughness. |
| Sulfur (S) | Tsawg dua lossis sib npaug li 0.005% | Tsawg heev kom txo cov kev suav nrog thiab txhim kho toughness. |
| Phosphorus (P) | Tsawg dua lossis sib npaug li 0.020% | Tsawg heev los tiv thaiv embrittlement. |
| Niobium (Nb) | 0.04 - 0.08% | Cov ntsiab lus tseem ceeb micro-alloying keeb rau cov nplej refinement thiab nag lossis daus. |
| Vanadium (V) | 0.04 - 0.08% | Lwm micro-alloying element rau nag lossis daus. |
| Titanium (Ti) | 0.01 - 0.03% | Pab tswj cov qoob loo loj thiab txhim kho HAZ toughness. |
Cov ntawv thov siv
L485 PSL2 yog qib workhorse rau niaj hnub, siab -muaj peev xwm kis tau tus mob kav dej:
Siab -Natural Gas Transmission Pipelines
Crude Roj Transmission Pipelines
Cov Khoom Pipelines (piv txwv li, diesel, dav hlau roj)
CO₂ Pipelines rau Carbon Capture thiab Storage (CCS)
Offshore Pipelines(qhov twg siab zog thiab toughness tseem ceeb heev)
Kev tswj hwm tus qauv
Kev tsim khoom ntawm L485 PSL2 kab yeeb nkab yog tswj hwm los ntawm tus qauv thoob ntiaj teb:
API 5L: Specification rau Kab Yeeb(tshaj tawm los ntawm American Petroleum Institute).
Tus qauv no txhais tau hais tias txhua qhov yuav tsum tau muaj rau qhov ntev, chemistry, cov khoom siv kho tshuab, kev sim, thiab tshuaj xyuas rau ob qib PSL1 thiab PSL2.
Summary: Qhov zoo ntawm L485 PSL2
Siab zog:Tso cai rau kev ua haujlwm siab dua lossis txo cov phab ntsa tuab.
Superior Toughness:Resistant nkig tawg, ua rau nws haum rau hnyav ib puag ncig.
Txhim kho Weldability:Tswj chemistry ua rau thaj chaw vuam ntau txhim khu kev qha.
High Quality Assurance:Kev ntsuam xyuas nruj (NDT, CVN) ua kom muaj qhov ua tau tsawg heev ntawm qhov tsis xws luag.
Hauv kev xaus, thaum koj pom "L485 PSL2," koj tab tom saib tus nqi, siab - cov khoom siv kav dej tau tsim los rau kev nyab xeeb, kev ua tau zoo, thiab kev ntseeg siab hauv cov haujlwm tseem ceeb tshaj plaws hauv lub ntiaj teb.
