1. "CJH115 Class 20" txhais li cas?
CJH115: Charpy V-ntiv taw kev kuaj ntawm-115 ° F (-81 ° C)(H=siab-lub zog, J=longitudinal test).
Chav Kawm 20: Hydrostatic xeem siab ntawm20,000 psi (138 MPa), qhia tias siab kam rau siab tshaj li hoob 12.
2. Qhov tseem ceeb sib txawv ntawm Chav Kawm 12?
Kev ntsuas siab dua(20K vs . 12K psi).
Cov kev xav tau nruj duarau kev siv cryogenic.
Feem ntau sivHloov kho chemistry / kho cua sov(piv txwv li, microalloyed steels).
3. Cov ntawv thov zoo li cas?
LNG cov terminals, subzero pipelines, thiaboffshore platformshauv cheeb tsam Arctic.
Tseem ceeb rausiab -siab cryogenic cia(eg, ethylene thauj).
4. Mechanical zog?
TensileNtau dua lossis sib npaug rau 70 ksi (483 MPa)
Yield: Ntau dua lossis sib npaug rau 40 ksi (276 MPa)
Kev cuam tshuam lub zog: Ntau dua lossis sib npaug li 20 ft -lb (27 J) ntawm -115℃F
Elongation: Ntau dua lossis sib npaug li 20% (2 "gauge length).
5. Fabrication xav tau?
100% radiography + PWHT(Post-Kev kho cua sov).
Ob -welded seamsrau kev ncaj ncees.
Traceabilityrau alloy batch vim nruj qis -T specs.
