PSL2 steel kav, los ntawm kev tswj cov tshuaj muaj pes tsawg leeg, ntau yam -kev tswj xyuas kev ua haujlwm tshwj xeeb, thiab tag nrho - cov txheej txheem kev sim, ua kom muaj kev tiv thaiv corrosion zoo dua thiab nkig tawg tsis kam piv rauPSL1nyob rau hauv huab cua ib puag ncig xws li lub hiav txwv tob thiab polar cheeb tsam. Txawm hais tias tus nqi pib yog 15% -20% siab dua, nws tuaj yeem txuag tau ob peb zaug ntawm tus nqi tu txhua lub neej.
Hauv kev lag luam roj thiab cov kav xa hluav taws xob thauj mus los, xaiv cov yeeb nkab steel uas tsim nyog yog lub hauv paus rau kev ua kom lub sijhawm ntev -kev nyab xeeb thiab kev lag luam ntawm cov kav dej. API 5L specification, tsim los ntawm American Petroleum Institute, yog ib tug thoob ntiaj teb lees paub tus qauv tseem ceeb. Nyob rau hauv cov qauv no, Cov Khoom Specification Level feem ntau yog muab faib ua PSL1 (Basic Grade) thiab PSL2 (Advanced Grade). CovQhov txawv ntawm PSL1 thiab PSL2tsis yog ib qho teeb meem ntawm "zoo" piv rau "phem"; es, lawv sawv cev rau txoj kev sib txawv uas tsim los rau qhov sib txawv ntawm qhov kev pab cuam thiab kev nyab xeeb.
Txhawm rau muab kev nkag siab meej thiab kev nkag siab ntawm lawv qhov sib txawv, cov kev tshuaj ntsuam hauv qab no rhuav tshem qhov sib txawv ntawm rau qhov tseem ceeb, ntxiv nrog kev sib piv ncaj qha ntawm cov ntaub ntawv tseem ceeb.
Siv ceev: Qhov sib txawv ntawm Core PSL1 thiab PSL2
Rau kev sib piv ntau intuitive ntawm lawv cov kev cai tseem ceeb, cov lus hauv qab no qhia txog qhov sib txawv ntawm cov tshuaj muaj pes tsawg leeg thiab cov khoom siv kho tshuab.
1. Chemical Composition Control Sib Piv
| Tswj yam khoom | PSL1 (qib theem pib) | PSL2 (qib Advanced) | Kev cuam tshuam ntawm qhov sib txawv |
|---|---|---|---|
| Phosphorus (P) & Sulfur (S) Cov ntsiab lus | Cov kev txwv tsis sib xws (piv txwv li, Qib B: P Tsawg dua lossis sib npaug li 0.03%, S Tsawg dua lossis sib npaug li 0.03%). | Kev txwv nruj dua(P Tsawg dua lossis sib npaug rau 0.025%, S Tsawg dua lossis sib npaug rau 0.015%). | Txo cov teeb meem impurities,ho txhim kho steel huv thiab tsis kam mus rau intergranular corrosion cracking. |
| Carbon (C) Cov ntsiab lus | Kev txwv siab tshaj plaws (piv txwv li, max C cov ntsiab lus rau Qib B tuaj yeem yog 0.28%). | Kev txwv nruj tshaj plaws, nrog rau kev qhia txogCarbon Equivalent (CEQ) tswj. | PSL2 txoj kev tswj cov pa roj carbon nruj thiab CEQ xam rauxyuas kom zoo weldability, tiv thaiv kev tsim cov tawv, nkig microstructures nyob rau hauv tshav kub- cuam tshuam cheeb tsam. |
| Micro-Alloying Elements (eg, V, Nb, Ti) | Tsuas yog tag nrho cov nyiaj ua ke yog vaguely txwv (piv txwv li, Nb + V + Ti Tsawg dua lossis sib npaug li 0.15%). | Tshem tawm cov kev txwv saum toj kawg nkaus tau teev tseg rau tus kheej cov ntsiab lus thiab lawv qhov sib xyaw ua ke (piv txwv li, V Tsawg dua lossis sib npaug rau 0.06%, Nb Tsawg dua lossis sib npaug rau 0.05%). | PSL2 ua haujlwmmeej grain refinement ntxiv dag zog, txhim kho lub zog thaum khaws cov khoom zoo duatoughness thiab weldability. |
2. Mechanical Properties Requirement Comparison
| Khoom | PSL1 (qib theem pib) | PSL2 (qib Advanced) | Kev cuam tshuam ntawm qhov sib txawv |
|---|---|---|---|
| Yuav tsum muaj zog (piv txwv li, X52) | "Muaj tsawg kawg nkaus": Yield Strength (YS) Ntau dua lossis sib npaug rau 359 MPa, Tensile Strength (TS) Ntau dua lossis sib npaug li 455 MPa. Tsis muaj kev txwv saum toj saud. | "Range Control": YS 386-544 MPa, TS 490-758 MPa. | Los ntawm kev txhais ob qho tib si sab sauv thiab qis zog txwv, PSL2 ua kom muaj kev ua tau zoo thiab ruaj khov, tsis txhob muaj cov khoom siv tawv heev lossis nkig. |
| Yield-rau-Tensile Ratio (Y/T) Tswj | Tsis tas yuav tsum tau ua. | Yuav tsum tau qhia meej(feem ntau Tsawg dua lossis sib npaug rau 0.93). | Tswj qhov Y / T ratio kom txausyas deformation muaj peev xwm, tiv thaiv kev tsis txaus ntseeg tam sim ntawd hauv cov kav dej hauv qab kev kub ntxhov. |
| Impact Toughness | Feem ntau zamlos ntawm kev ntsuam xyuas cuam tshuam. | Yuav tsum tauCharpy V-Notch (CVN) cuam tshuam qhov ntsuas yuav tsum tau (piv txwv li, ntawm 0℃: Longitudinal Ntau dua lossis sib npaug rau 41 J, Transverse Ntau dua lossis sib npaug rau 27 J). Cov kev xav tau rau X80 yog siab dua. | Qhov no yog qhov txiaj ntsig tseem ceeb ntawm PSL2 rauib puag ncig tseem ceeb xws li qis-kub thiab tob- hiav txwv daim ntaub ntawv, ua tau zooinhibiting ceev nrooj propagation. |
Hauv -Kev Ntsuam Xyuas Qhov Sib Txawv Ntawm PSL1 thiab PSL2
3. Kev Xeem thiab Kev Tshuaj Ntsuam Xyuas: Los ntawm Sampling mus rau Tag Nrho Traceability
Kev soj ntsuam Scope: PSL1 feem ntau ntiav cov qauv los yog tshuaj xyuas raws li xav tau. Hauv qhov sib piv, PSL2 siv a"Dual{0}}Barrier"Kev tshuaj xyuas qhov system:100% hydrostatic kuajntawm txhua cov yeeb nkab ntawm qhov siab dua thiab tuav lub sij hawm ntev dua, ua ke nrog qhov yuav tsum tau ua100% Tsis yog -Kev Ntsuam Xyuas Kev Puas Tsuaj (NDT)siv Ultrasonic Testing (UT) thiab Magnetic Particle Testing (MT).
Zoo Traceability: PSL1 feem ntau muab batch test reports. PSL2 yuav tsum tau tsim ibtag nrho traceability system los ntawm steel billet mus rau tus kheej yeeb nkab, nrog rau cov ntawv pov thawj Mill Test (piv txwv li, SR15 daim ntawv pov thawj) uas muaj tag nrho cov ntaub ntawv ua tau zoo. Qhov no muab cov ntaub ntawv tseem ceeb txhawb rau kev soj ntsuam tsis ua haujlwm thiab kev ntsuas lub neej.
4. Manufacturing txheej txheem tswj: Los ntawm kev ua raws li mus rau refinement
Txheej txheem ntau lawm: PSL1 yuav tsum tau ua raws li cov txheej txheem yooj yim.PSL2mandates ntau refined tswj, xws linqus tsev degassingntawm billets (tswj cov ntsiab lus hydrogen kom tsawg dua lossis sib npaug li 2 ppm) thiab tswj kev kho cua sov kom ua tiav ib qho zooacicular ferrite microstructure. Qhov no ncaj qha ua rau PSL2 cov kav dej muaj, qhov nruab nrab, dhau30% siab dua qis -kub los cuam tshuam toughnesstshaj PSL1.
Weld Kho: PSL1 tsis muaj kev txwv nruj rau kev kho. PSL2 qhia meej tiaskho nyob rau tib qhov chaw yuav tsum tsis txhob ntau tshaj ob zaug, thiab 100% NDT yog qhov yuav tsum tau ua tom qab- kho, tshem tawm thaj chaw kho raws li cov ntsiab lus tsis ua haujlwm.
5. Daim Ntawv Thov Scenarios: Sib piv Environmental Demands
PSL1, vim nws cov nqi kom zoo dua, yog haum rautsawg-kev pheej hmoo, ib puag ncig tus qauvxws li onshore pipelines nrog tsim pressuresTsawg dua lossis sib npaug li 1.6 MPa, kev thauj mus los ntawm cov roj crude ntawm ambient kub, thiab lub nroog gas distribution networks.
PSL2yog covkev xaiv tseem ceeb rau siab - ib puag ncig muaj kev pheej hmoo, feem ntau siv hauv:
Siab -siab ntev- deb ntawm cov kav xa hluav taws xob (tsim siab Ntau dua lossis sib npaug rau 6.4 MPa)
Arctic thiab qis - qhov kub thiab txias (hauv qab -20 degree)
Qab zib kev pabcuam ib puag ncigmuaj hydrogen sulfide (H₂S) / carbon dioxide (CO₂)
tob -sea pipelines (water depth >500 m)
6. Tus nqi vs. Kev tshuav nyiaj li cas: Kev lag luam ntawm lub sijhawm ntev - Saib
Txawm tias covTus nqi pib ntawm PSL2 yog 15% -20% siab dua, Qhov Kev Tshawb Fawb Txog Lub Neej (LCC) qhia txog nws cov txiaj ntsig tseem ceeb ntawm kev lag luam. Piv txwv li, lubcorrosion tus nqi ntawm PSL2 nyob rau hauv qaub ib puag ncig yuav tsawg li ib tug -peb ntawm PSL1, thiab lub sijhawm txij nkawm rau qhov tob - cov kav dej hiav txwv tuaj yeem txuas ntxiv los ntawm 8 xyoo mus rau 15 xyoo. Cov ntaub ntawv tshawb fawb qhia tau hais tias qhov kev nqis peev ntxiv rau PSL2 tuaj yeem ua rau kev saib xyuas thiab kev pheej hmoo txuag nyiaj ntau zaus hauv 20 xyoo.
Xaus
Tus qauv tsim qib API 5L embodies lub hauv paus ntsiab lus ntawm kev ntsuas kev nyab xeeb thiab kev lag luam. Raws li kev txhim kho cov roj thiab roj thoob ntiaj teb tau nce mus rau hauv qhov sib sib zog nqus- hiav txwv, arctic, thiab cov cheeb tsam corrosive heev, qhov kev thov rau siab - cov yeeb nkab ua tau zoo txuas ntxiv mus, thiabqhov kev faib ua feem ntawm PSL2 yog nce ntau. Cov ntawv tshaj tawm tshiab ntawm API 5L tus qauv txuas ntxiv ntxiv dag zog rau cov kev xav tau rau PSL2 txog kev puas tsuaj thiab cov txheej txheem vuam. Yog li ntawd, nkag siab qhovQhov sib txawv ntawm PSL1 thiab PSL2tsis yog tsuas yog qhov tseem ceeb rau kev xaiv cov txuj ci tab sis kuj tseem ceeb rau kev nkag siab cov qauv hauv kev tsim kho hluav taws xob yav tom ntej.
Email:baohui@bhsteelpipe.com
