1. ASTM A671 CJP 115 Chav Kawm 31 yog dab tsi?
A:ASTM A671 qhiahluav taws xob-fusion-welded steel kavrauqis-kev pabcuam kub. "CJP" txhais tau tiasUa kom tiav Joint Penetrationwelds, "115" yog qhovqib khoom siv(yield zog Ntau dua los yog sib npaug rau 65 ksi, tensile zog Ntau dua los yog sib npaug rau 115 ksi), thiab "Class 31" qhia tias tsim nyog rau-31 ° F (-35 ° C)ib puag ncig.
2. Qhov sib txawv tseem ceeb ntawm Chav Kawm 30 thiab Chav Kawm 31?
A:
Chav Kawm 30: Rated rau-30 ° F (-34 ° F).
Chav Kawm 31: Tsim los rau-31 ° F (-35 ° C), yuav tsum tau stricterkev ntsuam xyuas cuam tshuamthiab cov khoom toughness ntawm qis kub.
3. Yuav tsum ua cov txheej txheem tsim khoom?
A:Cov kav dej yuav tsum raug:
Vuam: Submerged arc vuam (SAW) lossis hluav taws xob tsis kam vuam (ERW) nrog kev nkag mus rau tag nrho.
Kev kho cua sov: Normalizing lossis quenching thiab tempering rau txhim kho qis -T ductility.
Kev sim: 100% radiography (RT) thiab kuaj hydrostatic ntawm ntau dua lossis sib npaug ntawm 2.4x tsim siab.
4. Yuav tsum muaj kev ntsuam xyuas tshuab?
A:Cov kev xeem tseem ceeb muaj xws li:
Tensile xeem( siv tau lub zog: Ntau dua lossis sib npaug rau 115 ksi tensile, Ntau dua lossis sib npaug rau 65 ksi tawm los).
Charpy V-ntiv tes ntsuas ntsuasntawm-31℃F(min. absorbed zog: 15 ft-lb).
Yeem:Kev sim hardnessrau kev pabcuam qaub (ib NACE MR0175).
5. Cov ntawv thov zoo li cas?
A:Siv nyob rau hauv huab cua ib puag ncig xws li:
LNG cia thiab thauj(-160℃systems).
Cryogenic ua cov nroj tsuag(ethylene, ammonia).
Arctic roj / roj pipelinesraug rau cyclic thermal stresses.
