API 5L X70 PSL2 yog dab tsi?
API 5L X70 yog qib siab -strength kab yeeb nkab qib uas nws lub npe hais txog qhov tsawg kawg nkaus yield zog ntawm 70,000 psi, sib npaug rau 485 MPa. Thaum muab rau PSL2, cov yeeb nkab yuav tsum tau ua kom tau raws li qhov yuav tsum tau ua ntawm Charpy qhov kev kuaj xyuas, kev txwv tshuaj lom neeg nruj, qhov siab tshaj plaws carbon sib npaug thiab tag nrho traceability. X70 yog qib tseem ceeb rau niaj hnub ntev -ntaus roj kab kab vim nws tso cai rau kev khiav hauj lwm siab nrog kev lag luam phab ntsa thicknesses.
Cov hlau yog qib microalloyed HSLA, feem ntau yog ua los ntawm cov thermo-txheej txheem tswj kev ua haujlwm, uas muab cov qauv zoo -grained qauv nrog lub zog siab thiab zoo heev qis- kub toughness.
Ntsiab Specification Requirements
| Kev xav tau | X70 PSL2 Tus nqi |
|---|---|
| Yield zog, min | 485 MPa (70,000 psi) |
| Tensile zog | 570-760 MPa |
| Yield rau tensile ratio, max | 0.93 |
| Cov pa roj carbon, max | 0.12% feem ntau |
| Manganese, max | 1.65% |
| Phosphorus, max | 0.025% |
| Sulfur, max | 0.015% |
| Carbon sib npaug CE, max | 0.43 |
Cov pa roj carbon tsawg thiab manganese txwv, ua ke nrog microalloys xws li niobium, vanadium thiab titanium, muab X70 nws lub zog thaum ua kom cov pa sib npaug tsawg txaus rau kev txhim khu kev lag luam vuam.
Toughness thiab kuaj
Charpy V-kev ntsuas qhov cuam tshuam yog qhov yuav tsum tau ua rau X70 PSL2, nrog rau qhov ntsuas kub ib txwm teev los ntawm txoj haujlwm, feem ntau ntawm 0 txog -30 degrees C. Qhov nruab nrab nqus hluav taws xob xav tau yog feem ntau 40 J lossis siab dua nyob ntawm cov ntawv luam thiab txoj kab uas hla. Txhua cov yeeb nkab yog kuaj hydrostatically, thiab tag nrho cov vuam ntev ntawm welded yeeb nkab yog kuaj los ntawm ultrasonic lossis radiographic txoj kev.
Kev tsim khoom thiab kev siv
X70 PSL2 yog tsim raws li LSAW thiab SSAW yeeb nkab rau loj diameters, thiab raws li ERW los yog seamless yeeb nkab rau qhov ntau thiab tsawg. Cov ntawv thov ib txwm muaj xws li cov kab xa hluav taws xob loj, siab - cov kab hluav taws xob siab siab, cov kav dej xa tawm sab nraud thiab cov kab kev pabcuam arctic. Cov qib kuj tseem siv rau cov kab yeeb nkab hauv cov haujlwm nrog kev tswj cov pob txha uas xav tau cov ntaub ntawv toughness.
FAQ
Q1. X70 txhais li cas hauv API 5L?
X70 txheeb xyuas qhov tsawg kawg nkaus lub zog ntawm 70,000 psi, uas sib npaug 485 MPa, muab tso rau hauv cov qib siab - zog kab yeeb nkab qib.
Q2. Vim li cas X70 siv rau cov kab xa hluav taws xob?
Nws lub zog siab tso cai rau kev ua haujlwm siab dua thiab cov phab ntsa nyias dua li cov qib qis, txo cov hlau tonnage, vuam lub sij hawm thiab tag nrho cov nqi xa mus ntev.
Q3. Puas yog X70 ib txwm muab rau PSL2?
Tsis yog, X70 tuaj yeem muab tau rau PSL1, tab sis PSL2 yog tus qauv kev lag luam rau X70 vim tias qib siab - muaj zog yog ib txwm xaiv rau cov kev pabcuam tseem ceeb uas yuav tsum muaj cov ntaub ntawv toughness.
Q4. Yuav ua li cas vuam kev txiav txim siab siv rau X70?
Cov pa roj carbon sib npaug yog txwv kom lav weldability. Field welding siv tsawg - hydrogen consumables, thiab cov txheej txheem yuav tsum tsim nyog rau cov qib tshwj xeeb thiab phab ntsa thickness.
Q5. X70 puas tuaj yeem tsim ua cov yeeb nkab seamless?
Yog lawm, X70 yog muaj nyob rau hauv seamless yeeb nkab, txawm hais tias nyob rau hauv loj diameters cov txheej txheem welded dominates vim hais tias ntawm loj txwv thiab economics.
Q6. Dab tsi yog qhov yuav tsum tau xeem rau X70 PSL2?
Tshuaj ntsuam xyuas, tensile test, Charpy impact testing, hydrostatic testing and, for welded pipe, full -ntev non-destructive test of the weld seam.
