X70 txhais li cas hauv Qib System
X70 yog lub npe imperial ntawm kab yeeb nkab qib hauv API 5L. Tsab ntawv X qhia txog cov khoom siv raws li cov raj xa dej, thiab tus lej 70 sau cov ntawv teev tseg yam tsawg kawg nkaus lub zog ntawm ntau txhiab phaus ib square inch. Nyob rau hauv cov ntsiab lus metric uas yog 485 MPa, yog li tib cov hlau tshwm nyob rau hauv specifications li qib L485.
X70 belongs rau pab pawg neeg siab zog micro-alloyed pipeline steels uas ua tau ntev, siab siab gas kis tau zoo. Piv nrog rau qib X52 lossis X60, nws tso cai rau cov phab ntsa nyias nyias rau tib lub siab tsim, uas txo cov kev siv steel, nqi tsheb thauj mus los thiab vuam ntim ntawm qhov project loj. Kev lag luam tawm yog tias X70 xav tau kev tswj hwm nruj dua ntawm chemistry, dov xyaum thiab vuam txheej txheem.
Qib sib npaug thoob ntiaj teb
Cov qauv sib npaug piav qhia txog qib tib lub zog hauv cov txheej txheem sib txawv. Lawv sib npaug hauv cov chav kawm muaj zog, tab sis cov ncauj lus kom ntxaws, kev kam rau siab thiab cov kev sim ntsuas tsis zoo ib yam, yog li qhov project specification yuav tsum nco ntsoov lub npe ntawm tus qauv tsab nws raws li nram no.
| Qhov system | Lub npe | Sau ntawv |
| API 5L | 70x485 ua | Imperial thiab metric designations ntawm tib qib |
| TS EN ISO 3183 | L485 los yog L485M | M qhia txog qhov ntsuas kub -txheej txheem dov kev xa khoom |
| European pipeline txheem | L485 MB | Siv rau onshore gas kis pipelines |
| Suav teb chaws tus qauv rau kab yeeb nkab | L485 | Daim iav qhov qauv ISO qib |
| Forged flange thiab haum specifications | F70 qib | Siv rau forgings nrog 70,000 psi yam tsawg kawg nkaus yield zog |
Vim tias cov ntawv txuas ntxiv piav qhia txog kev xa khoom ntau dua li lub zog, kev txiav txim rau X70 yuav tsum hais tias cov yeeb nkab puas yuav tsum tau muab cov thermo-khoov, normalized los yog quenched thiab tempered, nrog rau cov khoom specification theem.
Lub zog thiab Chemistry ntawm Qib
| Khoom | PSL2 xav tau |
| Yam tsawg kawg yield zog | 485 MPa ua |
| Maximum yield zog | 605MPa ua |
| Tsawg kawg tensile zog | 570 MPa ua |
| Maximum tensile zog | 760 MPa ua |
| Elongation | xam los ntawm tus qauv qauv |
| Impact test | xav tau ntawm qhov ntsuas kub ntsuas |
X70 steel yog cov pa roj carbon tsawg - cov khoom siv alloyed. Cov pa roj carbon monoxide feem ntau tuav tau qis dua 0.15 feem pua hauv cov thermo- cov yeeb nkab uas siv tshuab, manganese muab cov tshuaj muaj zog, thiab ntxiv me me ntawm niobium, vanadium thiab titanium refine cov qauv nplej. Sulfur thiab phosphorus tau khaws cia qis vim tias cov khoom sib xyaw txo ob qho tib si toughness thiab tsis kam rau hydrogen induced cracking. Molybdenum thiab npib tsib xee tuaj yeem muab ntxiv rau hauv cov phab ntsa tuab lossis cov khoom siv kub tsawg, thiab cov pa roj carbon sib npaug tau tshaj tawm kom cov txheej txheem vuam tuaj yeem tsim kom raug.
Qhov txiaj ntsig ntawm qhov kev siv tshuaj no yog tias X70 tsis yog lub zog siab carbon steel xwb. Nws cov khoom yog los ntawm kev sib xyaw ua ke ntawm lean, huv si muaj pes tsawg leeg thiab tswj cov txheej txheem dov, thiab qhov kev sib xyaw ua ke yog qhov tso cai rau cov yeeb nkab kom ncav cuag 485 MPa yield zog thaum tuav cov kev cuam tshuam toughness.
PSL1 thiab PSL2 rau X70
PSL1 yeeb nkab yog muab los ntawm qhov tsawg kawg nkaus lub zog qhov tseem ceeb thiab cov kev txwv chemistry yooj yim. PSL2 ntxiv qhov siab tshaj plaws tawm los zog, nruj dua chemistry, yuav tsum tau kuaj Charpy cuam tshuam thiab tsis yog -kev kuaj xyuas ntawm qhov vuam seam. Feem ntau cov haujlwm loj kis tau tus mob qhia PSL2 rau X70 vim tias qhov kev kuaj xyuas qhov hnyav ntxiv yog qhov tseem ceeb rau cov kab sib txuas welded ua haujlwm ntawm kev kub siab.
Tej kev siv
Kev ncua deb, txoj kab uas hla loj, siab siab natural gas kis pipelines.
Cov roj Crude thiab cov khoom lub cev kab uas muaj peev xwm hydraulic yuav tsum maximised.
Offshore pipelines, qhov uas txo cov phab ntsa thickness txo qhov hnyav nruab.
Kev nyab xeeb tej yaam num, muab qhov cuam tshuam qhov ntsuas kub tau teev tseg kom phim qhov tsim yam tsawg kawg nkaus kub.
Kev kub siab manifolds, risers thiab chaw nres tsheb kav uas siv X70 forgings thiab fittings ntawm cov chav kawm muaj zog.
Vuam thiab Fabrication Notes
Vuam yog qhov twg X70 tej yaam num ua tiav los yog ua tsis tiav. Cov lean chemistry uas muab cov qib nws toughness kuj ua rau lub tshav kub cuam tshuam cheeb tsam rhiab heev rau vuam tshav kub input, yog li cov txheej txheem vuam tsim nyog yuav tsum tau tsim nyob rau hauv cov qib tiag tiag, phab ntsa thickness thiab vuam txheej txheem ua ke rau qhov chaw siv.
Preheat cov cai yuav tsum tau tsim los ntawm kev ntsuas cov pa roj carbon sib npaug thiab cov ntu tuab dua li qhov xav tau.
Thaum tshav kub kub input yuav tsum tau tswj nyob rau hauv lub tsim nyog ntau yam, vim hais tias cov cua kub input ntau coarsens lub tshav kub cuam tshuam cheeb tsam thiab txo toughness.
Kev xaiv cov khoom siv yuav tsum ua raws li cov chav kawm ntawm cov yeeb nkab lub zog thiab cov kev xav tau cuam tshuam rau ntawm qhov tsim yam tsawg kawg nkaus kub.
Girth weld tshuaj xyuas los ntawm kev kuaj ultrasonic tsis siv neeg yog kev coj ua ntawm X70 kis kab mob.
Field dabtsi yog khoov, yog tias xav tau, yuav tsum hwm cov kev txwv tshwj xeeb ntawm cov yeeb nkab.
Xaiv Ntawm X70 thiab Qib qis
Qhov kev txiav txim siab yuav tsum tau ua rau tag nrho cov nqi nruab es tsis yog tus nqi yeeb nkab ib leeg. Tsiv ntawm X60 mus rau X70 txo cov phab ntsa thickness thiab yog li ntawd steel hnyav, freight thiab weld ntim, tab sis nws nce tus nqi ntawm vuam txheej txheem tsim nyog, tshuaj xyuas thiab kho tej hauj lwm. Ntawm txoj kab uas hla loj, kev kub siab, txoj kab ntev kev txuag yog ib txwm txiav txim siab. Ntawm cov kab luv luv, cov chaw nres tsheb thiab cov tshuab xa hluav taws xob tsis tshua muaj siab, qhov kev tswj xyuas zoo ntxiv feem ntau yog cov khoom txuag, thiab qib qis dua nrog cov phab ntsa hnyav dua yog qhov ua tau zoo dua.
FAQ
Q: X70 cov khoom sib npaug yog dab tsi?
Nws yog sib npaug rau qib L485 hauv cov qauv ntsuas thiab ISO, thiab rau L485MB hauv European pipeline tus qauv. Txhua tus piav qhia txog qhov tsawg kawg nkaus tawm lub zog ntawm 70,000 psi, lossis 485 MPa.
Q: Puas yog X70 zoo ib yam li L485?
Yog lawm. X70 thiab L485 yog ob lub npe rau tib qib API 5L, ib qho qhia hauv imperial units thiab lwm yam hauv metric units.
Q: Lub zog ntawm X70 steel yog dab tsi?
Qhov siab tshaj plaws tawm los yog 485 MPa. Ntawm PSL2 qhov siab tshaj plaws yog 605 MPa, yog li cov yeeb nkab xa tawm yuav tsum poob rau hauv lub qhov rais.
Q: Qhov txawv ntawm X70 thiab X65 yog dab tsi?
Ob leeg yog siab zog micro-alloyed kab yeeb nkab qib, tab sis X70 muaj ib tug siab dua qhov tsawg kawg nkaus yield zog, 485 MPa tiv 450 MPa rau X65, uas tso cai rau ib tug nyias phab ntsa rau tib lub siab tsim.
Q: Puas yog X70 yeeb nkab xav tau preheating ua ntej vuam?
Tsis tas li. Preheat nyob ntawm qhov sib npaug ntawm cov pa roj carbon monoxide, phab ntsa thickness thiab ambient tej yam kev mob, thiab qhov yuav tsum tau yuav tsum tau teem los ntawm cov txheej txheem vuam tsim nyog rau kev sib xyaw ua ke ntawm qib thiab phab ntsa thickness.
Q: X70 puas tuaj yeem siv rau kev pabcuam qaub?
Tsuas yog nrog kev tsim nyog ntxiv. Cov kev pabcuam qaub tau txwv qhov nyuaj thiab tshuaj lom neeg raws li ISO 15156 uas txwv tsis pub cov qhab nia thiab kev ua haujlwm uas yuav siv tau.
