1. ASTM A671 CD70 Class 61 Steel Pipe yog dab tsi?
Teb:
ASTM A671 CD70 Chav Kawm 61 yog asiab -kev ua tau zoo hluav taws xob- fusion-welded (EFW) carbon steel yeeb nkabtsim rauultra-tsawg- kev pabcuam kub(hauv qab-70 ° F / -57 ° C). Cov ntsiab lus tseem ceeb:
cd70 ua: Cov khoom siv qib yuav tsum tauCharpy V- ntsuas qhov cuam tshuam ntawm -70℃Flos xyuas kom meej cryogenic toughness.
Chav Kawm 61: Yam tsawg kawg nkaus yield zog ntawm61 ksi (420 MPa), engineered rausiab heev -cryogenic systems(piv txwv li, LNG liquefaction nroj tsuag, hydrogen cia, aerospace cryogenic roj systems).
2. Dab tsi yog qhov kev tsim khoom thiab ntawv pov thawj?
Teb:
Vuam: EFW txheej txheem nrog ultra- qis- sulfur muab tub lim,100% radiography (RT) + phased -array ultrasonic kuaj (PAUT)rau qhov tsis xws luag - dawb welds.
Kev kho cua sov: quenched & tempered kom ua tiav cov qauv zoo tshaj plaws rau kev ua haujlwm cryogenic.
Daim ntawv pov thawj: Mill test reports (MTRs) yuav tsum muaj xws li:
Cov tshuaj muaj pes tsawg leeg (piv txwv li, C Tsawg dua lossis sib npaug li 0.18%, Mn Tsawg dua lossis sib npaug li 1.85%, microalloyed nrog Nb / V / Ti).
Mechanical zog (yield zog ntau dua los yog sib npaug rau 61 ksi, tensile zog 95-125 ksi).
Impact test results at-70℃F(tsawg kawg 55 ft-lb nruab nrab lub zog nqus).
3. Chav Kawm 61 piv rau lwm chav ASTM A671 li cas?
Teb:
| Parameter | cd70 qib 61 | CD70 50 | cd70 qib 80(Tshwj xeeb Order) |
|---|---|---|---|
| Yield zog | 61 ksi (420 MPa) | 50 ksi (345 MPa) | 80 ksi (550 MPa) |
| Daim ntawv thov | Heev - siab cryogenic | Siab -siab | Kev cai ultra-siab-siab |
| Nqi | Hwm | Siab | Tshwj xeeb siab - tus nqi |
4. Dab tsi yog qhov ntev thiab qhov kam rau ua?
Teb:
Txoj kab uas hla: 24"–160" OD (rau mega-scale zog tej yaam num).
Phab ntsa Thickness: Ua siab ntev± 5% nominal thickness( nruj tshaj plaws hauv ASTM A671).
Ntev: Customizable mus txog120ft (36.6m)nrog ob -submerged arc vuam (DSAW) kev xaiv.
5. Yuav ua li cas txhawm rau tiv thaiv corrosion thiab kev nyab xeeb ntawm kev ua haujlwm?
Teb:
Sab nraud:
3 LPP txheej(3-txheej polypropylene) nrog UV tsis kam rau Arctic / subsea siv.
Advanced cathodic tiv thaiv nrog tej thaj chaw deb saib xyuas rau offshore installations.
Sab hauv:
Electropolished + FBE hauv ob sab phlu nrog H₂S / CO₂ tsis kam rau kev pabcuam qaub.
Kev tu:
Txhua xyoo ntse pigging nrogMFL + EMAT (electromagnetic acoustic transducer)rau kev ntes tawg.
