API 5L L245N Seamless Steel Kab Pipe yog dab tsi?
L245Nyog pipeline steel designation los ntawmAPI SPEC 5Lthiab Suav sib npaugGB/T 9711. Lub "L" sawv cev rau kab yeeb nkab, "245" qhia tias qhov tsawg kawg nkaus tawm lub zog ntawm245 MPa (kwv yees 35 ksi), thiab "N" qhia covnormalizedkev xa khoom. Normalizing ua kom zoo, zoo ib yam ferrite-pearlite qauv uas txhim kho qis- qhov kub thiab txias thiab ua kom cov khoom zoo ib yam los ntawm cov phab ntsa, ua rau L245N seamless yeeb nkab yog ib qho kev xaiv zoo rau onshore thiab subsea oil thiab gas pipelines.
Tshuaj muaj pes tsawg leeg
| Element | Hom txwv |
|---|---|
| Cov pa roj carbon (C) | Tsawg dua lossis sib npaug li 0.16% |
| Manganese (Mn) | 1.20–1.40% |
| Phosphorus (P) | Tsawg dua lossis sib npaug li 0.025% |
| Sulfur (S) | Tsawg dua lossis sib npaug li 0.015% |
| Microalloys (Nb, V) | Txoj kev ntxiv |
Cov ntsiab lus tsis tshua muaj carbon khaws cia weldability, thaum manganese thiab me me niobium / vanadium ntxiv txhawb zog thiab toughness. Tsawg leej faj thiab phosphorus txhim kho corrosion kuj thiab txo qhov kev pheej hmoo ntawm nkig tawg.
Mechanical Properties
Yield zog:
Ntau tshaj los yog sib npaug rau 245 MPa (ib txwm muaj 245-450 MPa)
Tensile zog:
415-760 MPa
Elongation:
Ntau dua lossis sib npaug li 23%
Impact toughness:
Charpy V-notch Ntau dua lossis sib npaug rau 40 J ntawm -20℃(ib GB / T 9711 kev sim)
Kev Ntsuas thiab Kev Tswj Xyuas Zoo
Cov cuab yeej siv tshuab raug txheeb xyuas nrog tensile thiab Charpy cuam tshuam kuaj raws li ASTM A370. API 5L mandates tag nrho -ntev ultrasonic kuaj rau seamless yeeb nkab, nrog rhiab heev muaj peev xwm los xyuas qhov tsis xws luag nyob rau hauv 5% ntawm phab ntsa thickness. Rau siab - cov kab hluav taws xob siab, eddy- tam sim no lossis kev kuaj hluav taws xob tau ntxiv. Cov kav dej rau cov kua qaub ib puag ncig yog tsim nyog nrog NACE TM0177 HIC thiab SSC kev ntsuam xyuas, qhov twg qhov tawg rhiab ntawm qhov sib piv, tawg qhov ntev piv thiab tawg thickness piv yuav tsum nyob qis dua 2% tom qab 96 teev ntawm kev tso dej.
Daim ntawv thov
Onshore roj thiab natural gas kis pipelines
Subsea flowlines thiab export kab
Chemical thiab petrochemical txheej txheem piping
Boiler thiab cua kub exchanger raj hauv fais fab nroj tsuag
Cov qauv kev txhawb nqa thiab cov khoom siv kho tshuab
Cov lus nug nquag
N hauv L245N txhais li cas?
N txhais tau hais tias cov yeeb nkab raug xa mus rau hauv cov xwm txheej zoo, muab cov qauv zoo thiab txhim kho toughness piv nrog rau cov khoom siv dov li -.
Puas yog L245N zoo ib yam li API 5L Qib B?
L245 thiab Qib B piav qhia tib lub zog 245 MPa; L245N kuj qhia txog normalization raws li tus me nyuam tus mob.
L245N yeeb nkab puas tuaj yeem welded hauv thaj teb?
Yog lawm. Nws tsis tshua muaj carbon sib npaug thiab tswj chemistry ua rau nws yooj yim weldable nrog tus qauv qis -hydrogen txheej txheem.
Qhov txawv ntawm L245N thiab L245M yog dab tsi?
L245N yog normalized, thaum L245M yog thermomechanically dov (TMCP); ob leeg ua tau raws li qhov tsawg kawg nkaus 245 MPa tawm los tab sis ua tiav nws los ntawm kev ua haujlwm sib txawv.
Puas yog L245N haum rau qis -kev pabcuam kub?
Normalizing txhim kho toughness, thiab nrog rau kev ntsuam xyuas ntawm -20℃lossis qis dua, L245N tuaj yeem ua haujlwm hauv cov kav dej txias.
Tus qauv twg tswj hwm L245N?
API SPEC 5L thiab Suav pipeline txheem GB/T 9711 ob leeg npog L245N, thiab dual- cov ntaub ntawv pov thawj feem ntau muab nkag.
