ASTM A671 yog dab tsi?
ASTM A671 yog tus qauv rauhluav taws xob-fusion-welded steel kavsiv nyob rau hauv siab -siab, qis- daim ntawv thov kub (xws li, cryogenic ib puag ncig). Nws txhais cov kev xav tau rau cov khoom siv, vuam, kev sim, thiab qhov ntev kom ntseeg tau tias muaj kev ntseeg siab hauv cov txheej txheem tseem ceeb.
"CJP 115 Chav Kawm 40" txhais li cas?
CJP: Ua kom tiav Joint Penetrationwelding, xyuas kom tag nrho - qhov tob welds rau kev ncaj ncees.
115: Ib hypotheticalyield zog qib(~115 ksi), tshaj cov qib txheem (piv txwv li, Qib 65=65 ksi).
Chav Kawm 40: Tej zaum yuav yog ib qho kev cai lossis yuam kev; ASTM cov chav kawm muaj los ntawm1 rau 13(piv txwv li, Chav Kawm 13 rau -325℃F kev pabcuam). Yog tias siv tau, nws txhais tau tias qhov ntsuas kub tsis tshua muaj zog (dhau -350℃F).
Cov khoom siv tseem ceeb?
Kev sib xyaw: Cov pa roj carbon steel nrog cov ntsiab lus tswj tau (piv txwv li, C Tsawg dua lossis sib npaug li 0.25%, P Tsawg dua lossis sib npaug li 0.025%) rau weldability thiab toughness.
Lub zog: Yield zog Ntau dua los yog sib npaug rau 115 ksi, tensile zog Ntau dua los yog sib npaug rau 130 ksi (kwv yees).
Toughness: Charpy V-kev ntsuas qhov cuam tshuam ntawm ultra- qhov kub thiab txias (xws li -400℃F rau Chav Kawm 40 sib npaug).
Tej daim ntawv thov?
Cov kav dej no siv rau hauvib puag ncig heevxws li:
Liquefied hydrogen los yog helium pipelines
Aerospace cryogenic systems
Quantum xam cov cua txias infrastructure
Arctic subsea roj / roj ua haujlwm.
Yuav tsum tau vuam thiab kuaj?
Vuam: Tag nrho -kev nkag welds nrog cov txheej txheem ua ntej; post-weld heat treatment (PWHT) yuav tsum tau ua.
Kev sim:
Hydrostatic kuaj (Ntau dua lossis sib npaug rau 2x tsim siab)
100% radiography/ultrasonic kuaj
Kev ntsuas cuam tshuam ntawm qhov ntsuas kub tsim (xws li -400℃F).
