API 5L X65 (L450) Kab Yeeb: Qib Cov Ntaub Ntawv thiab Cov Lus Qhia Xaiv

Txhais thiab Standard Basis

API 5L X65 yog qib siab zog kab yeeb nkab qib nrog cov lus qhia tsawg kawg nkaus lub zog ntawm 65 000 psi, sib npaug rau 450 MPa; ISO 3183 xaiv tib qib L450. Cov yeeb nkab yog tsim rau ib qho ntawm ob yam khoom tshwj xeeb. PSL1 npog cov kev cai hauv paus. PSL2 ntxiv qhov yuav tsum tau txwv ntawm chemistry thiab carbon sib npaug, yuav tsum ntsuas qhov ntsuas qhov hnyav thiab qhov yuav tsum tau ntsuas hydrostatic ntawm txhua qhov ntev, uas ua rau nws qib ib txwm muaj rau cov kav xa hluav taws xob tsim los rau cov kav dej lees paub. Qib yog nyob rau hauv pab pawg ntawm micro-alloyed, thermomechanically ua cov hlau uas niobium, vanadium thiab titanium ntxiv ua ke nrog kev tswj dov xa lub zog thiab toughness yam tsis muaj kev cuam tshuam rau kev sib txuas.

Chemical Composition thiab Weldability

Rau PSL2 yeeb nkab API 5L txwv yog carbon 0.24 feem pua ​​​​siab tshaj plaws, manganese 1.40 feem pua ​​​​siab tshaj plaws rau cov khoom seamless, phosphorus 0.025 feem pua ​​​​siab tshaj plaws thiab sulfur 0.015 feem pua ​​​​siab tshaj plaws, nrog rau cov nyiaj ntawm niobium, vanadium thiab titanium txwv rau 0.15 feem pua. Cov pa roj carbon sib npaug yog txwv rau 0.43 feem pua ​​​​ntawm cov qauv IIW qhov twg carbon yog 0.12 feem pua ​​lossis qis dua, lossis rau 0.25 feem pua ​​​​Pcm qhov twg cov pa roj carbon ntau dua tus nqi ntawd. Qhov tshwm sim hauv daim teb yog qhov ua tau zoo: qhov sib npaug qis carbon txhawb cov txheej txheem vuam tsim nyog nrog kev txwv lossis tsis muaj preheat rau cov phab ntsa tuab, thiab cov qauv zoo nplej uas tsim los ntawm kev tswj dov muab qhov sib npaug ntawm lub zog thiab qhov kub tsis tshua muaj zog. Qhov twg cov kab nqa cov roj qaub ntub dej, ib qho kev txwv hardness ntxiv thiab kev tswj cov sulfur nruj dua feem ntau ntxiv los txo qhov kev pheej hmoo ntawm sulphide kev ntxhov siab tawg.

Mechanical Properties

Rounding thiab phab ntsa thickness cuam tshuam cov txiaj ntsig tau tshaj tawm, thiab qhov ntsuas qhov muaj zog yog ib txwm qhia ua ke nrog txoj kev sim siv, vim tias 0.5 feem pua ​​​​ntxiv rau kev thauj khoom thiab 0.2 feem pua ​​​​ntawm txoj kev offset tuaj yeem sib txawv los ntawm ob peb megapascals ntawm tib cov qauv.

Kev kuaj, kuaj thiab xa khoom

Txhua PSL2 ntev tau txais kev kuaj hydrostatic ntawm lub siab xam los ntawm txoj kab uas hla thiab phab ntsa thickness, ib qho kev ntsuam xyuas cuam tshuam los ntawm cov yeeb nkab lub cev, thiab kev soj ntsuam tsis muaj kev puas tsuaj ntawm vuam seam rau welded yeeb nkab. Dimensional soj ntsuam npog txoj kab uas hla, phab ntsa, ovality thiab kawg npaj. Cov yeeb nkab kawg tuaj yeem ua tau yooj yim, bevelled rau thaj chaw girth welding, threaded nrog couplings, los yog grooved, thiab sab hauv lossis sab nrauv txheej yog siv tom qab kuaj. Cov ntaub ntawv ib txwm muaj xws li daim ntawv pov thawj khoom siv, cov ntaub ntawv ntsuas hydrostatic thiab cov txiaj ntsig ntawm qhov ntsuas kub. Cov kev xav tau ntxiv tuaj yeem ntxiv qhov poob - qhov hnyav tsim kua muag rau kev ntes pob txha, kev soj ntsuam qhov tawv nqaij ntawm lub seam, lossis kev tshuaj xyuas ultrasonic ntawm lub cev tag nrho.

Daim Ntawv Thov thiab Kev Xaiv Logic

X65 yog siv rau cov kab hluav taws xob siab siab, cov kab tsheb thauj mus los, cov kab xa tawm sab nraud, cov risers thiab cov kav dej hauv chaw nres tsheb uas muaj zog dua - rau - qhov hnyav piv li X60 txo cov phab ntsa thickness, steel tonnage thiab vuam lub sij hawm. Kev txuag yog tiag tiag tab sis raws li txoj cai: cov phab ntsa nyias nyias txo qhov kev tso cai tsis xws luag, nce qhov kev thov ntawm girth weld zoo thiab ua rau kev puas tsuaj thiab ovality tseem ceeb dua. Onshore kab nrog kev ncua deb thiab loj diameters tau txais txiaj ntsig zoo tshaj plaws, tshwj xeeb tshaj yog thaum ua ke nrog cov qauv tsim siab dua tso cai los ntawm cov kav dej siv tau. Rau luv luv, high pressure station piping, X60 los yog txawm tus qauv siab piping qib yuav muab ib tug zoo tag nrho cov nqi txoj hauj lwm vim vuam thiab kev soj ntsuam xyuas dominates tus nqi ntsia.

Cov lus nug nquag

Q:Lub zog tawm ntawm X65 yeeb nkab yog dab tsi?
A: Qhov tsawg kawg nkaus lub zog tawm los yog 450 MPa, sib npaug rau 65 000 psi. Rau PSL2 yeeb nkab qhov siab tshaj plaws yog 600 MPa, muab qhov kev lees paub ntawm 450 MPa rau 600 MPa.

Q:Puas yog API 5L X65 carbon steel?
A: Yog, nws yog micro- alloyed carbon steel kab yeeb nkab qib. Cov alloying ntxiv yog me me, tab sis tswj dov thiab me me niobium, vanadium thiab titanium cov ntsiab lus nce lub zog saum toj ntawm cov qib carbon steel xws li X42 lossis X52.

Q:Dab tsi yog qhov txawv ntawm PSL1 thiab PSL2 rau X65?
A: PSL2 txwv qhov siab tshaj plaws ntawm cov pa roj carbon, manganese, phosphorus thiab sulphur, tswj cov pa roj carbon sib npaug, yuav tsum muaj kev ntsuas cuam tshuam thiab yuav tsum muaj kev sim hydrostatic ntawm txhua qhov ntev. PSL1 tsis muaj kev txwv tsawg dua thiab tsis tas yuav muaj cov kev sim no tshwj tsis yog tias lawv raug txiav txim ua tshuaj ntxiv.

Q:X65 piv nrog X70 li cas?
A: X70 muaj qhov tsawg kawg nkaus tawm lub zog ntawm 485 MPa, 35 MPa saum X65. Nws tso cai rau cov phab ntsa nyias nyias rau tib lub siab tsim, uas yog qhov txaus nyiam nyob rau hauv txoj kab uas hla loj, cov kab nyob ntev, tab sis nws xav tau cov txheej txheem vuam nruj dua thiab tswj tau zoo dua ntawm cov tawv thiab ovality.

Q:Cov yeeb nkab kawg configurations twg muaj?
A: Plain kawg, bevelled kawg rau girth welding, threaded thiab coupled xaus, thiab grooved xaus. Kev xaiv ua raws li kev sib koom ua ke, txheej txheej txheej thiab cov kev cai ntawm kev cog lus tsim kho.

Q:X65 puas tuaj yeem siv rau qhov kub thiab txias?
A: Yog, muab qhov kev ntsuas qhov ntsuas kub thiab qhov xav tau ntawm lub zog nqus tau teev tseg rau qhov tsawg kawg nkaus tsim hlau kub, thiab feem ntau nrog kev tua tag nrho, nplua nplej hlau. Daim ntawv xaj yuav tsum hais qhov ntsuas qhov ntsuas kub tsis yog tso siab rau lub hauv paus specification.