ASTM A671 tus qauv yog dab tsi?
ASTM A671 qhia txog cov cai rauhluav taws xob-fusion-welded steel kavsiv nyob rau hauv siab -siab, qis- kev siv kub, xws li cov kev pabcuam cryogenic. Nws suav nrog cov qib khoom, cov txheej txheem vuam, cov txheej txheem 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 cov nroj tsuag lossis cov kav dej tshuaj, nrog rau kev tsom mus rau kev tiv thaiv kev puas tsuaj hauv cov xwm txheej hnyav.
"CJP 115 Chav Kawm 43" txhais li cas rau cov yeeb nkab steel no?
CJP: Sawv rauUa kom tiav Joint Penetration welding, ua kom tiav - qhov tob welds kom 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: Tsis yog -tus qauvyield zog qib, implying qhov kwv yees qhov tsawg kawg nkaus tawm lub zog ntawm 115 ksi (piv rau cov qauv qib zoo li Qib 65 ntawm 65 ksi), rau kev txhim kho load- cov kabmob muaj peev xwm.
Chav Kawm 43: Zoo li ib tug tswv cuab; ASTM cov chav kawm muaj li ntawm 1 txog 13 (xws li, Chav Kawm 13 rau -325℃F kev pabcuam). Yog tias siv tau, nws qhia tias ultra- qhov kub thiab txias tsis kam (hauv qab -475℃F), tsom rau cov ntawv thov qib siab uas cov chav kawm tsis txaus.
Yam khoom tseem ceeb twg yuav tsum muaj?
Cov khoom tseem ceeb muaj xws li:
Tshuaj muaj pes tsawg leeg: Cov pa roj carbon steel nrog kev tswj nruj (piv txwv li, carbon Tsawg dua lossis sib npaug ntawm 0.18%, phosphorus Tsawg dua lossis sib npaug rau 0.012%, sulfur Tsawg dua lossis sib npaug li 0.008%) txhawm rau txhim kho weldability thiab toughness.
Mechanical Strength: Yam tsawg kawg nkaus yield zog ~ 115 ksi thiab tensile zog ~ 130 ksi (kwv yees), ua kom ruaj khov nyob rau hauv siab.
Toughness: Charpy V-qhov ntsuas qhov cuam tshuam ntawm qhov kub thiab txias (piv txwv li, -475℃F) kom lav qhov tawg tsis kam, nrog lub zog nqus qhov pib tsim rau cov xwm txheej huab cua.
Qhov twg yog cov kav dej feem ntau siv?
Cov kav dej no yog tsim los rautxiav- thev naus laus zisnyob rau hauv huab cua phem, xws li:
Quantum suav cov cryogenic tes hauj lwm rau supercooled Cheebtsam.
Fusion zog reactor coolant systems yuav tsum tau xau- pov thawj.
Sib sib zog nqus- chaw tshawb nrhiav chaw nyob nrog lub neej- txhawb nqa cov kav dej hauv ultra- qhov kub thiab txias.
Arctic lossis subsea hydrogen cia chaw nyob ntawm qhov tob tshaj 10,000 ko taw.
Dab tsi yog qhov yuav tsum tau ua ntawm vuam thiab kev sim?
Cov kev xav tau muaj xws li:
Vuam: Automated lossis robotic CJP vuam nrog lub sijhawm tiag - tswj kom zoo; Yuav tsum tau tshaj tawm -weld heat treatment (PWHT) kom txo tau kev ntxhov siab thiab txhim kho toughness.
Kev sim: Hydrostatic testing ntawm ntau dua los yog sib npaug rau 3.5x 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, -475℃F) kom siv tau cov kev ua tau zoo tiv thaiv kev ua tsis tiav.
