1. ASTM A671 CJE115 Chav Kawm 22 yog dab tsi?
Txuj: Hluav taws xob-fusion-welded (EFW) carbon steel yeeb nkab rauultra-siab- kev pabcuam cryogenic(-115 ° F / -81.7 ° C).
Chav Kawm 22: Hydrostatic xeem siab ntawm22,000 psi (152 MPa)(qib siab tshaj hauv A671 tus qauv).
Tus cim tseem ceeb:
"CJE115"=Charpy V-notch impact tested at-115℃Fnrog min. 15 ft-lb (20 J).
Yuav tsum normalizationrau grain refinement.
2. Qhov twg yog nws feem ntau siv?
Heev -siab cryogenics:
LNG carrier containment systems
Ua kua hydrogen thauj pipelines
Tshwj xeeb zog:
Deepwater roj & roj risers
Arctic siab hlab ntsha
Nuclear auxiliary systems: Cryogenic coolant loops
3. Mechanical & tshuaj muaj zog?
Lub zog:
Tensile: Ntau dua lossis sib npaug rau 60 ksi (414 MPa)
Tawm tswv yim: Ntau dua lossis sib npaug rau 35 ksi (241 MPa)
Toughness:
100% cuam tshuam kuaj ntawm-115℃F
Elongation: Ntau dua lossis sib npaug li 22% (scaled ib thickness)
Chemistry:
Carbon: Tsawg dua lossis sib npaug li 0.30%
Tsawg S / P (tsawg dua lossis sib npaug rau 0.035% txhua)
4. Cov kev cai tsim khoom?
Vuam:
EFW nrog100% radiography (RT)+ UT rau tag nrho -ntev seams.
Kev sim:
Hydrostatic siab:22,000 psi(152 MPa)
Ntxiv NDE (MT/PT) rau thaj chaw tseem ceeb.
Traceability:
Thaum tshav kub kub- cov ntawv ceeb toom cuam tshuam tshwj xeeb.
5. Cov txheej txheem Fabrication?
Vuam:
Preheat: 200-400 ° F (93-204 ° C)
PWHT required for thickness >1.5 "(38mm).
Kev tsim:
Txias khoov tau tso cai (min. 5D radius).
Kev tsim kub yuav tsum tau rov ua dua- normalization.
Kho:
Sib tsoo qhov tob Tsawg dua lossis sib npaug li 10% phab ntsa thickness (ib ASTM A671 Sec.12).
