1. ASTM A671 CD70 Class 70 Steel Pipe yog dab tsi?
Teb:
ASTM A671 CD70 Chav Kawm 70 yog atxiav- ntug hluav taws xob- fusion-welded (EFW) carbon steel yeeb nkabengineered 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℃Fvalidate cryogenic toughness.
Chav Kawm 70: Yam tsawg kawg nkaus yield zog ntawm70 ksi (483 MPa), tsim rausiab heev -cryogenic systems(eg, tom ntej no -gen LNG liquefaction nroj tsuag, hydrogen cia ntawm 700+ bar, aerospace cryogenic roj xa).
2. Dab tsi yog qhov kev tsim khoom thiab ntawv pov thawj?
Teb:
Vuam: EFW txheej txheem nrog lub tshuab nqus tsev -degassed muab tub lim hlau,100% radiography (RT) + phased -array ultrasonic kuaj (PAUT)nrog AI- tsav tsheb paub txog qhov tsis xws luag.
Kev kho cua sov: quenched & tempered nrog cryogenic stabilization rau grain refinement.
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 0.15%, Mn Tsawg dua lossis sib npaug li 2.10%, microalloyed nrog Nb/V/Ti/B rau lub zog- qhov sib npaug ntawm qhov sib npaug).
Mechanical zog (yield zog ntau dua los yog sib npaug rau 70 ksi, tensile zog 115-145 ksi).
Impact test results at-70℃F(tsawg kawg 70 ft-lb nruab nrab lub zog nqus).
3. Chav Kawm 70 piv rau lwm chav ASTM A671 li cas?
Teb:
| Parameter | 70 CD70 | CD70 50 | cd70 qib 80(Kev cai) |
|---|---|---|---|
| Yield zog | 70 ksi (483 MPa) | 50 ksi (345 MPa) | 80 ksi (550 MPa) |
| Daim ntawv thov | Heev - siab cryogenic | Siab -siab | Tshwj xeeb ultra-siab- siab |
| Nqi | Hwm + | Siab | Tus nqi tsim nyog |
4. Dab tsi yog qhov ntev thiab qhov kam rau ua?
Teb:
Txoj kab uas hla: 24"–180" OD (rau mega-scale zog infrastructure).
Phab ntsa Thickness: Ua siab ntev± 4% nominal thickness(kev lag luam-ua qhov tseeb).
Ntev: Customizable mus txog150 ft (45.7 m)nrog DSAW siab heev (ob -Submerged Arc Vuam).
5. Yuav ua li cas txhawm rau tiv thaiv corrosion thiab kev nyab xeeb ntawm kev ua haujlwm?
Teb:
Sab nraud:
3LPP-Nano txheej(polypropylene nrog nanoparticle reinforcement) rau subsea / Arctic extremes.
IoT- qhib kev tiv thaiv cathodic nrog kev kwv yees kwv yees.
Sab hauv:
Laser{0}}clad FBE hauv ob sab phlu rau hydrogen embrittlement kuj.
Kev tu:
Autonomous robotic soj ntsuam nrogPAUT + ECA (Eddy Current Array)rau lub sijhawm tiag tiag - kuaj pom qhov tsis txaus.
