1. ASTM A671 CJA115 Class 12 Steel Pipe yog dab tsi?
Teb:
ASTM A671 CJA115 Chav Kawm 12 yog anickel-alloyed hluav taws xob-fusion-welded (EFW) steel yeeb nkabtsim rauultra-low- kub thiab siab - kev pabcuam siab(rated rau12,000 psi hydrostatic test siab). Cov yam ntxwv tseem ceeb:
Khoom Qib: CJA115 npecarbon hlau nrog 3.5% nickel, optimized rau cryogenic toughness (kev pab mus rau-150℃F / -101 degree).
Chav Kawm 12: Qhia txog kev ua haujlwm siab dua piv rau cov chav kawm qis (piv txwv li, Chav Kawm 10/11).
Daim ntawv thov: LNG thauj, cryogenic cia tank, thiab Arctic / subsea pipelines.
2. Nws cov khoom tseem ceeb thiab cov cuab yeej cuab tam yog dab tsi?
Teb:
Tshuaj muaj pes tsawg leeg:
C: Tsawg dua lossis sib npaug li 0.25%,Mn: 0.50–1.35%, Ni: 3.5%.
TsawgS/Pcov ntsiab lus kom txo brittleness.
Mechanical Performance:
Tensile zog:Ntau dua lossis sib npaug rau 80 ksi (550 MPa)
Yield zog:Ntau dua lossis sib npaug rau 50 ksi (345 MPa)
Charpy V-nqaj cuam tshuam kuaj ntawm -150℃F(yam tsawg kawg 20 ft-lb zog nqus).
3. Nws tsim thiab zoo li cas -Tau?
Teb:
Fabrication txheej txheem:
Hluav taws xob- fusion vuam (EFW) nrog cov hlau muab tub lim, ua raws lipuv -lub cev normalizationlos yog tempering.
Ncej -weld kev kho cua sov (PWHT)yuav tsum tau ua kom txo tau kev ntxhov siab.
Kev Ntsuas & Kev Tshuaj Xyuas:
100% Cov duab hluav taws xob (RT)los yogphased{0}}array ultrasonic (PAUT)kev soj ntsuam vuam.
Hydrostatic kuaj ntawm12,000 psi(raws li chav kawm 12 yuav tsum tau).
4. Cov ntawv thov tseem ceeb thiab qhov zoo dua li lwm cov chav kawm?
Teb:
Kev siv thawj zaug:
LNG export terminals: Siab -siab cryogenic pipelines.
Offshore platforms: Subsea risers hauv Arctic tej yam kev mob.
Qhov zoo:
Kev ntsuas siab dua(Class 12 vs. Class 10/11) rau cov txheej txheem tseem ceeb.
Superiorqis -kub pob txha tiv thaivvim 3.5% Ni alloying.
5. Ua raws li cov qauv thiab kev txiav txim siab txog qhov project?
Teb:
Cov qauv:
Core: ASTM A671 (EFW kav dej rau qis-kev pabcuam kub).
Complementary: ASME B31.3 (Process Piping), NACE MR0175 (kev pabcuam qaub).
Daim ntawv pov thawj:
Mill Test Reports (MTRs) nrog chemistry, mechanical tests, and NDE results.
Xaiv tauthib peb- tog validation(piv txwv li, DNV GL rau tej yaam num offshore).
