1. Dab tsi yog qhov txawv ntawm ASTM A671 CJE115 Chav Kawm 21?
Txuj: Hluav taws xob-fusion-welded (EFW) carbon steel yeeb nkab rauultra-low- kev pabcuam kub(-115 ° F / -81.7 ° C).
Chav Kawm 21: Hydrostatic xeem siab ntawm21,000 psi (145 MPa)(siab tshaj hauv A671 tus qauv).
Cov yam ntxwv tseem ceeb:
"CJE115"=Charpy V-notch impact tested at-115℃Fnrog min. 15 ft-lb (20 J).
Normalized kho cua sovxav tau rau grain refinement.
2. Cov ntawv thov kev lag luam zoo li cas?
Siab -siab cryogenic thauj: LNG / LPG export terminals, ethylene cracker units.
Sib sib zog nqus- hiav txwv zog systems: Subsea manifolds, Arctic pipeline khi-ins.
Tshwj xeeb tub yees: Ua kua hydrogen/oxygen ntim tshuab.
3. Cov khoom tseem ceeb specifications?
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(min{0}} ft-lb).
Elongation: Ntau dua lossis sib npaug li 22% (scaled ib thickness).
Chemistry: Tswj qis-carbon (tsawg dua lossis sib npaug li 0.30%) nrog kev hloov kho Mn/Si.
4. Kev tsim khoom & kev tswj xyuas zoo?
Vuam: EFW txheej txheem nrog100% radiography (RT)los yog automated UT.
Kev sim:
Hydrostatic Test ntawm21,000 psi(siab tshaj A671 chav kawm).
Ntxiv NDE (MT / PT) rau cov ntawv thov tseem ceeb.
Traceability: Thaum tshav kub kub- cov ntawv ceeb toom cuam tshuam tshwj xeeb yuav tsum tau ua.
5. Cov kev coj ua zoo tshaj plaws?
Vuam:
Preheat: 200-400℃F (93-204 degree).
PWHT pom zoo kom txo kev ntxhov siab.
Kev tsim:
Tso cai khoov txias (min. 5D radius).
Kub dabtsi yog khoov yuav tsum muaj kev ntsuam xyuas zoo.
Kho: Sib tsoo txwv Tsawg dua lossis sib npaug li 10% phab ntsa thickness ib ASTM A671 Sec.12.
