1. Dab tsi txhais tau tias ASTM A671 CJE115 Chav Kawm 20?
Txuj: Hluav taws xob-fusion-welded (EFW) carbon steel yeeb nkab raukev pabcuam cryogenic(-115 ° F / -81.7 ° C).
Chav Kawm 20: Hydrostatic xeem siab ntawm20,000 psi (138 MPa)(siab tshaj hoob 12/13).
Cov cim tseem ceeb:
"CJE115"=Charpy V-notch impact tested at-115℃F.
Normalized kho cua sovyuav tsum tau.
2. Nws feem ntau siv qhov twg?
Siab -siab cryogenic systems: LNG terminals, ethylene pipelines.
Offshore / Arctic zog: Subsea pipelines, txias- huab cua ua cov nroj tsuag.
Industrial tub yees: Ammonia / CO₂ tshuab xav tau kev kub siab ua haujlwm.
3. Nws cov khoom siv tshuab yog dab tsi?
Tensile zog: Ntau dua lossis sib npaug ntawm 60 ksi (414 MPa).
Yield zog: Ntau dua lossis sib npaug rau 35 ksi (241 MPa).
Impact toughness: Min.15 ft -lb (20 J)ntawm-115℃F.
Elongation: Ntau dua lossis sib npaug li 22% (nws txawv nrog phab ntsa tuab).
4. Nws tsim thiab kuaj li cas?
Vuam: EFW nrog100% radiography (RT)los yog kuaj ultrasonic (UT).
Kev kho cua sov: Normalized rau txhim kho qis -kub toughness.
Kev sim: Hydrostatic Test ntawm20,000 psi, ntxiv rau qhov kev ntsuam xyuas cuam tshuam rau txhua qhov cua sov.
5. Cov kev cai tseem ceeb ntawm kev tsim khoom?
VuamPreheat (200-400℃F / 93-204 degree) +PWHT pom zoo.
Khoov: Txias dabtsi yog khoov tso cai nrog lub vojvoog Ntau dua lossis sib npaug ntawm 5x txoj kab uas hla.
Tsis zoo: Kev kho yuav tsum ua raws liASTM A671 Tshooj 12.
