Thaum Ntxov: Nws yog dab tsi?
API 5L:Qhov no yog cov txheej txheem tshwj xeeb uas tau teev tseg los ntawm American Petroleum Institute (API) uas tswj hwm kev tsim cov yeeb nkab steel siv rau kev thauj mus los hauv cov kav dej hauv kev lag luam roj av thiab cov nkev.
X46:Qhov no txhais tau tiasYam tsawg kawg Yield Strengthntawm cov hlau. Qhov "X" txhais tau tias nws yog qib siab - lub zog, thiab "46" txhais tau tias nws muaj qhov tsawg kawg nkaus tawm los ntawm46,000 psi(Pounds ib square Inch). Hauv metric units, qhov no yog kwv yees li317 MPa ua.
PSL2:Qhov no sawv rauKhoom Specification Qib 2. PSL2 yog cov txheej txheem nruj dua li PSL1, suav nrog kev ua kom muaj zog dua, kev sim nruj dua, thiab kev tswj hwm tshuaj lom neeg nruj dua.
Cov yam ntxwv tseem ceeb thiab qhov yuav tsum tau muaj (PSL2 Focus)
PSL2 cov kav dej yog tsim los rau cov ntawv thov ntau dua, xws li cov kav dej tawm sab nraud, cov kev pabcuam qaub (kua roj nrog H₂S), lossis thaj chaw uas muaj qhov kub thiab txias.
1. Tshuaj muaj pes tsawg leeg
PSL2 muaj kev tswj hwm nruj dua ntawm cov tshuaj lom neeg kom ntseeg tau tias muaj kev sib tw, lub zog, thiab kev tiv thaiv kev tawg, tshwj xeeb tshaj yog nyob rau hauv kev pabcuam qaub.
Maximum Carbon sib npaug (CE):Txwv kom ntseeg tau tias muaj kev sib txuas zoo thiab tiv thaiv hydrogen -induced cracking (HIC). Muaj ob hom qauv:
CE IIW:C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15
CE Daim Ntawv Pom Zoo:C + Si/30 + Mn/20 + Cu/20 + Ni/60 + Cr/20 + Mo/15 + V/10 + 5B
Lower Phosphorus thiab Sulfur (P & S):Cov impurities no raug txwv los txhim kho toughness thiab tsis kam rau HIC / SSC (Sulfide Stress Cracking).
Micro{0}} alloying:Cov ntsiab lus zoo li Niobium (Nb), Vanadium (V), thiab Titanium (Ti) feem ntau ntxiv rau me me kom muaj zog los ntawm kev ua kom zoo dua cov nplej.
2. Mechanical Properties
Yield zog (min):46,000 psi (317 MPa)
Tensile zog (min):60,000 psi (414 MPa)
Yield -rau-Tensile Ratio (Y/T):Rau PSL2, qhov piv txwv no feem ntau capped (xws li, Tsawg dua lossis sib npaug rau 0.93 rau qee qhov ntau thiab tsawg / qib) kom ntseeg tau tias muaj peev xwm thiab tiv thaiv buckling thaum lub sijhawm teeb tsa lossis ua haujlwm.
Hardness:Qhov siab tshaj plaws hardness txwv tau teev tseg kom txo tau qhov kev pheej hmoo ntawm SSC hauv qhov chaw qaub.
Charpy V-Ntch Impact Test: Yuav tsum tau rau PSL2.Cov kav dej yuav tsum ua kom pom qhov tsawg kawg nkaus nqus lub zog ntawm qhov ntsuas kub ntsuas kom ntseeg tau tias lawv tuaj yeem tiv taus cov pob txha tawg.
3. Qhov yuav tsum tau ua thiab kev xeem
Qhov Loj:Kev tswj nruj ntawm sab nraud txoj kab uas hla, phab ntsa thickness, thiab ntev.
Tsis yog -Kev Ntsuas Kev Puas Tsuaj (NDT):Txhua lub yeeb nkab yog raug rau 100% tsis yog- kuaj kev puas tsuaj. Cov txheej txheem muaj xws li:
Kev kuaj ultrasonic (UT):Txhawm rau kuaj pom qhov tsis zoo ntawm sab hauv thiab sab nraud hauv cov yeeb nkab lub cev.
Eddy Current Testing (ECT):Feem ntau siv rau weld seam ntawm ERW / HFW kav.
Hydrostatic Test:Txhua lub kav dej yuav tsum tiv taus qhov siab - ntsuas dej siab yam tsis muaj dej.
Cov txheej txheem tsim khoom
API 5L X46 PSL2 yeeb nkab tuaj yeem tsim nyob rau hauv ob txoj hauv kev:
Seamless (SMLS):Ua los ntawm piercing ib tug khoom billet ntawm steel. Nws tsis muaj longitudinal weld seam thiab feem ntau suav hais tias muaj zog dua rau kev siv siab -siab.
Welded (EW / ERW / SAW):
Fais Welded (EW) / High-Frequency Welded (HFW):Tsim los ntawm ib tug steel kauj (skelp) thiab longitudinal seam yog welded siv hluav taws xob tam sim no. Feem ntau rau cov kab me me.
Submerged Arc Welded (SAW):Ntxiv muab faib ua Longitudinal (LSAW) thiab Kauv (SSAW). LSAW yog ib qho ntawm cov kab uas loj dua thiab paub txog nws qhov zoo thiab lub zog.
Cov ntawv thov siv
API 5L X46 PSL2 yeeb nkab yog siv nyob rau hauv ib tug ntau yam ntawm nruab nrab- siab daim ntaub ntawv nyob rau hauv lub zog sector:
Onshore thiab Offshore Sib Sau Kab:Sau roj lossis roj los ntawm ntau lub qhov dej.
Transmission Pipelines:Kev thauj cov roj, roj, lossis lwm yam hydrocarbons hla kev deb.
Txheej Txheem Piping:Nyob rau hauv refineries thiab petrochemical nroj tsuag.
Kev siv tus qauv:Qee lub sij hawm siv los ua piling lossis hauv cov txheej txheem ua haujlwm, txawm hais tias qhov no tsis yog nws qhov kev siv thawj zaug.
Sib piv: PSL1 vs. PSL2 rau X46
| Feature | PSL1 | PSL2 |
|---|---|---|
| Tshuaj Tswj | Tsawg nruj | nruj heev (CE, P, S txwv) |
| Kev ntsuam xyuas cuam tshuam | Tsis xav tau | Yuav tsum tau |
| Tensile Test | Nyob rau hauv 1 lub cev | Nyob rau 1 yeeb nkab rau cua sov kho ntau |
| Yield zog Max | Tsis Qhia | Feem ntau teev (piv txwv li, 90 ksi max) |
| Y/T ratio | Tsis muaj Cap | Feem ntau Capped |
| Hardness Test | Tsis xav tau | Yuav tsum tau |
| NDT | Sampling Basis | 100% ntawm cov kav dej |
| Daim ntawv thov | Tsawg Xav Tau, Tsawg-siab | Critical, Sour Service, Offshore |
Cov ntsiab lus
API 5L X46 PSL2yog lub siab -zoo, nruab nrab- lub zog carbon steel yeeb nkab tsim los rau kev ntseeg siab hauv kev thov cov roj thiab cov kav dej. Nws txoj kev xaiv PSL2 kom ntseeg tau tias nws tau dhau los ua kev tswj hwm nruj, kev sim, thiab kev lees paub zoo kom ua tau zoo nyob rau hauv kev kub ntxhov, nyob rau hauv ib puag ncig hnyav, thiab qhov chaw tiv thaiv kev tawg yog qhov tseem ceeb.
