ASTM A671 yog dab tsi?
ASTM A671 yog tus qauv rauhluav taws xob-fusion-welded steel kavtsim los rau siab -siab, qis- kev siv kub, xws li cov kev pabcuam cryogenic. Nws qhia txog cov kev xav tau ntawm cov ntaub ntawv, cov txheej txheem vuam, kev sim (xws li, hydrostatic thiab kev ntsuam xyuas qhov cuam tshuam), thiab qhov ntev ntev kom ntseeg tau tias muaj kev ntseeg siab hauv cov txheej txheem tseem ceeb xws li LNG nroj tsuag lossis aerospace systems. Cov txheej txheem no tseem ceeb tshaj qhov xau- pov thawj kev ua tau zoo thiab kev puas tsuaj puas tsuaj nyob rau hauv cov xwm txheej hnyav.
"CJP 115 Chav Kawm 52" txhais li cas rau cov yeeb nkab no?
CJP: Ua kom tiav Joint Penetration welding, yuav tsum muaj tag nrho - qhov tob welds txhawm rau tshem tawm qhov tsis xws luag thiab ua kom muaj kev ncaj ncees ntawm cov qauv hauv siab - ib puag ncig kev ntxhov siab.
115: A hypothetical yield zog qib(~ 115 ksi lossis ~ 793 MPa), tshaj cov qib ASTM (piv txwv li, Qib 65 ntawm 65 ksi) rau kev txhim kho load-cov kabmob muaj peev xwm hauv kev thov.
Chav Kawm 52: Zoo li akev ua tau zoo tier; ASTM cov chav kawm raug suav txij li 1 txog 13 (piv txwv li, Chav Kawm 13 rau -325℃F lossis -198℃kev pabcuam). Yog tias siv tau, nws lub hom phiaj ultra- qhov kub thiab txias (qis dua -550℃F lossis -321 degree), ua rau nws tsim nyog rau cov haujlwm siab tshaj xws li quantum thev naus laus zis lossis kev tshawb nrhiav tob tob uas cov chav kawm luv luv.
Dab tsi yog cov khoom siv tseem ceeb uas yuav tsum tau muaj?
Cov khoom tseem ceeb muaj xws li:
Tshuaj muaj pes tsawg leeg: Carbon steel nrog ultra-tsis muaj impurities (piv txwv li, C Tsawg dua lossis sib npaug rau 0.12%, P Tsawg dua lossis sib npaug rau 0.008%, S Tsawg dua lossis sib npaug rau 0.002%) rau qhov zoo tshaj plaws weldability, toughness, thiab corrosion kuj.
Mechanical Strength: Yam tsawg kawg nkaus yield zog Ntau dua los yog sib npaug rau 115 ksi (~ 793 MPa) thiab tensile lub zog siab dua los yog sib npaug rau 130 ksi (~ 896 MPa) los daws cov kev kub ntxhov.
Toughness: Mandatory Charpy V-notch impact testing at cryogenic temperatures (e.g., -550°F or -321°C), with energy absorption >50 J los tiv thaiv kev tawg ntawm kev ua haujlwm.
Cov yeeb nkab no feem ntau siv nyob qhov twg?
Cov kav dej no yog engineered rautxiav-ntev, siab- daim ntawv thov kev pheej hmoo, xws li:
Quantum xam cov kev sib txuas lus cryogenic xav tau kev ruaj ntseg sub-zero ib puag ncig.
Fusion reactor coolant systems rau cov cua sov kom zoo nyob rau hauv lub tshuab nqus tsev.
Interplanetary mission pipelines (piv txwv li, Mars chaw nyob) rau lub neej -txhawb cov kua hauv ultra- qhov chaw txias.
Deep-ocean hydrogen storage at depths >25,000 ko taw (~ 7,620 meters), qhov twg siab thiab kub siab heev xav kom muaj zog.
Cov txheej txheem vuam thiab kev ntsuas dab tsi yog qhov yuav tsum tau ua?
Cov kev cai tseem ceeb muaj xws li:
Vuam: Automated CJP cov txheej txheem nrog AI- tsav kev soj ntsuam rau qhov tsis xws luag- cov pob qij txha dawb; yuav tsum tau tshaj tawm -weld heat treatment (PWHT) thiab kev ntxhov siab los txhim kho cov khoom siv hlau.
Kev sim: Kev ntsuam xyuas hydrostatic siab ntau dua los yog sib npaug rau 5x tsim siab, 100% tsis yog- kuaj kev puas tsuaj (piv txwv li, phased-array ultrasonics), thiab kev ntsuam xyuas cuam tshuam ntawm qhov ntsuas kub (piv txwv li, -550℃F) kom siv tau cov kev ua tau zoo tiv thaiv kev ua tsis tiav xws li tawg lossis tawg.
