High-Cov ntsiab lus ntawm theem
L290 PSL2yog qib tshwj xeeb thiab qib zoo ntawm cov yeeb nkab steel uas txhais los ntawm tus txheej txheem thoob ntiaj tebTS EN ISO 3183. Hauv cov ntsiab lus yooj yim:
L290:Lub "L" sawv cev rau "Line Pipe." Tus lej "290" qhia txog qhovYam tsawg kawg nkaus Yield Strength(YS). Cov yeeb nkab no muaj qhov tsawg kawg nkaus lub zog ntawm 290 Megapascals (MPa) lossis kwv yees li42,000 phaus ib square inch (psi). Qhov no yog ib qho kev ntsuas ntawm kev ntxhov siab uas cov hlau tuaj yeem tiv taus yam tsis muaj deformation mus tas li.
PSL2:Sawv rauKhoom Specification Qib 2. Qhov no yog qhov siab dua - zoo, qib nruj dua ntawm cov kev xav tau piv rau PSL1. Cov kav dej PSL2 raug tso cai rau cov ntawv thov tseem ceeb dua, xws li siab - cov pa xa hluav taws xob, kev pabcuam qaub (muaj H₂S), lossis thaj chaw sab nraud.
Hauv cov txheej txheem API 5L qub, qib no tau raug hu uaX42.
Cov ncauj lus kom ntxaws txog qhov Specification
1. Mechanical Properties (Key Differentiator for PSL2)
PSL2 muaj kev nruj dua thiab cov cuab yeej siv dav dav dua li PSL1.
| Khoom | Qhov xav tau rau L290 PSL2 | Sau ntawv |
|---|---|---|
| Yam tsawg kawg nkaus Yield Strength (YS) | 290 MPa (42,100 psi) | Ntsuas nyob rau hauv ib qho kev ntsuas tensile. Qhov kev ntxhov siab uas cov khoom pib deform plastically. |
| Tensile zog (TS) | 415 - 565 MPa (60, 300 - 82,000 psi) | PSL2 qhia asiab tshaj tensile zog, uas PSL1 tsis. Qhov no ua kom zoo dua weldability thiab tswj cov khoom hardness. |
| Yield -rau-Tensile Ratio (Y/T) | Tsawg dua lossis sib npaug li 0.93 | Qhov no yog qhov tseem ceeb tshaj plaws rau PSL2. Qhov qis dua txhais tau hais tias cov yeeb nkab muaj ntau "reserve zog" tom qab yielding, ua rau nws ntau ductile thiab resistant rau tawg propagation. |
| Charpy V-Ntch Impact Test | Yuav tsum tau | PSL2 cov kav dej yuav tsum raug kuaj xyuas kom paub tseeb tias lawv cov tawv tawv ntawm qhov kub qis. Qhov no tiv thaiv brittle puas. |
| Hardness txwv | Tsawg dua lossis sib npaug li 250 HV10 | Qhov siab tshaj plaws hardness tau teev tseg los txo qhov kev pheej hmoo ntawm Sulfide Stress Cracking (SSC) hauv qhov chaw qaub. |
2. Chemical Composition (Chemistry Control)
PSL2 muaj kev tswj nruj dua ntawm cov tshuaj muaj pes tsawg leeg ntawm cov hlau kom ua tau raws li qhov xav tau cov khoom siv kho tshuab thiab weldability.
Carbon sib npaug (CE):Qhov siab tshaj Carbon sib npaug tau teev tseg (piv txwv li, CE({}){\\text{Pcm}} lossis CE{\\text{IIW}}). Qhov no yog xam tus nqi uas pab kwv yees tusweldabilitythiab hardenability ntawm cov hlau. Cov nqi qis dua CE feem ntau txhais tau tias zoo dua weldability nrog tsawg dua kev pheej hmoo ntawm kev tawg.
Phosphorus thiab Sulfur (P & S):Cov kev txwv siab tshaj plaws ntawm cov impurities no raug yuam kom txhim kho toughness thiab tsis kam rau Hydrogen Induced Cracking (HIC).
3. Kev kuaj thiab tshuaj xyuas
PSL2 yuav tsum muaj ntau yam tsis yog-kev kuaj kev puas tsuaj (NDT) kom muaj kev ncaj ncees:
Full -Kev Ntsuas Lub Cev Ultrasonic (UT):Tag nrho ntev ntawm cov yeeb nkab lub cev yog ultrasonically soj ntsuam rau imperfections.
Xaus UT lossis Magnetic Particle Inspection (MPI):Cov yeeb nkab kawg raug tshuaj xyuas tshwj xeeb rau laminations.
Hydrostatic Test:Txhua qhov ntev ntawm cov yeeb nkab yog kev sim siab mus rau qib siab dua li qhov nws tau teev tseg tsawg kawg nkaus lub zog (SMYS).
Sib piv: PSL1 vs. PSL2 rau L290
| Feature | L290 PSL1 | L290 PSL2 |
|---|---|---|
| Daim ntawv thov | Tsawg qhov tseem ceeb, qis-siab, tsis yog- cov kev pabcuam qaub | Tseem ceeb, siab -siab, qaub kev pab cuam, offshore, tawg{1}}tseem ceeb |
| Tensile zog | Yam tsawg kawg nkaus xwb | Yam tsawg kawg thiabQhov siab tshaj plaws |
| Yield/Tensile Ratio | Tsis Qhia | Max 0.93 |
| Charpy Impact Test | Tsis yuam | Yuav tsum tau |
| Hardness Test | Tsis yuam | Yuav tsum tau |
| Carbon sib npaug | Tsis Qhia | Txwv tsis pub tshaj |
| NDT (Ultrasonic) | Sampling hauv paus lossis tsawg dua qhov yuav tsum tau ua | Yuav Tsum Tau Ua Tag Nrho -Lub Cev & Xaus UT |
Common Manufacturing Txheej txheem
L290 PSL2 cov kav dej feem ntau yog tsim los siv ob txoj haujlwm tseem ceeb:
Seamless (SMLS):Cov yeeb nkab yog tsim los ntawm cov khoom siv hlau uas tau tho thiab elongated. Nws tsis muaj seam weld, ua rau nws zoo ib yam nyob rau hauv lub zog nyob ib ncig ntawm nws ncig. Zoo tagnrho rau kev siv siab -siab.
Welded (ERW, SAW):
Electric Resistance Welded (ERW):Cov yeeb nkab yog tsim los ntawm cov hlau kauj thiab cov seam yog welded siv hluav taws xob tsis muaj cov hlau muab tub lim. Niaj hnub nimno HF-ERW yog qhov zoo heev.
Submerged Arc Welded (SAW):Cov yeeb nkab yog tsim los ntawm cov hlau phaj thiab cov seam yog welded siv ib qho arc nyob rau hauv ib daim pam ntawm flux. Cov kav dej SAW tuaj yeem yog ib leeg (SAW) lossis ob chav (DSAW) seam thiab muaj rau cov kab loj loj.
Tej kev siv
L290 PSL2 yeeb nkab yog siv rau hauv cov ntawv thov uas muaj kev nyab xeeb thiab kev ntseeg siab yog qhov tseem ceeb:
Siab -Natural Gas Transmission Pipelines
Crude Roj Transmission Pipelines
Sour Service Pipelines(kev thauj cov kua uas muaj Hydrogen Sulfide - H₂S)
Offshore Pipelines(subsea flow kab, sib sau kab)
Tshuaj thiab Petrochemical Cog Piping
Dej Txhaj Kabhauv cov roj thiab roj
Xaus
L290 PSL2 Carbon Steel Kab Yeebyog lub siab - cov yeeb nkab muaj kev ncaj ncees tsim los rau kev pabcuam tseem ceeb. Qhov kev xaiv "PSL2" yog qhov tseem ceeb, qhia tias nws tau dhau los ua kev tswj hwm nruj dua, kev sim ntau dua, thiab tau txhim kho cov khoom siv kho tshuab (xws li qhov sib piv Y / T thiab qhov yuav tsum tau ua kom muaj zog) kom muaj kev nyab xeeb thiab kev ua tau zoo hauv cov cheeb tsam nyuaj xws li siab - roj xa mus thiab kev pabcuam qaub.
