1. Dab tsi txhais tau tias ASTM A671 CA55 Class 12 steel kav?
A:Cov no yoghluav taws xob-fusion-welded (EFW) carbon steel kavtsim rausiab-siab thiab qis-kev pabcuam kub(hauv qab-50 ° F / -45 ° C).
"CA55": Qhia txog chemistry (carbon steel nrog Si, Mn tswj) thiab yuav tsum tau uaCharpy impact testrau qis-kub toughness.
"Class 12": Qhia aHydrostatic xeem siab ntawm 12,000 psi, ua rau nws tsim nyog rau kev thov ntau dua li Chav Kawm 10/11.
Kev siv tseem ceeb:LNG terminals, refinery siab - cov kab siab, thiab khaws cia cryogenic.
2. Chav Kawm 12 piv rau lwm chav kawm hauv ASTM A671 li cas?
A:
Siab Muaj Peev Xwm: Chav kawm 12=12,000 psi (vs. 10K/11K rau Chav Kawm 10/11; 20K rau Chav Kawm 20).
Phab ntsa Thickness: Thicker dua Class 10/11 tab sis sib dua dua Class 20+, ntsuas lub zog thiab tus nqi.
Daim ntawv thov: Qhov zoo tshaj plaws rau nruab nrab - mus rau - cov tshuab siab siab qhov twg Chav Kawm 10/11 tsis txaus tab sis Chav Kawm 20 dhau lawm - qhia.
3. Cov qauv thiab ntawv pov thawj siv tau li cas?
A:
Thawj Standard: ASTM A671 (EFW kav dej rau qis-kev pabcuam kub).
Kev ntsuam xyuas tseem ceeb:
Hydrostatic Test: 12,000 psi yam tsawg kawg nkaus.
NDT: 100% radiographic (RT) los yog ultrasonic (UT) weld soj ntsuam.
Charpy V-Ntch Test: Yuav tsum tau ntawm -50℃F / -45℃rau qib CA55.
Nco tseg:Kev ua raws li ASME B31.3 rau cov txheej txheem piping kuj yuav tsum tau.
4. Dab tsi yog fabrication thiab vuam yuav tsum?
A:
Vuam txheej txheem: Submerged arc vuam (SAW) los yog zoo sib xws, nrogpuv nkag welds.
Tshaj tawm -Kev kho cua sov (PWHT): Yuav tsum tau ua kom txo qis kev ntxhov siab (raws li ASTM A671).
Dimensional Tolerances: Kev nruj nruj rau OD (± 0.8%), phab ntsa thickness (± 10%), thiab ncaj (tsawg dua lossis sib npaug li 0.2% ntawm qhov ntev).
5. Cov kav 12 feem ntau siv nyob qhov twg?
A:
Roj & Roj: High-siab gas kis, offshore platforms.
Zog: Fais fab nroj tsuag chav kab, cryogenic tshav kub exchangers.
Tshuaj: Tuav cov roj liquefied (piv txwv li, nitrogen, argon).
