1. ASTM A671 CC65 Class 42 Pipe yog dab tsi?
Txhais: A siab -siab hluav taws xob- fusion-welded (EFW)carbon steel yeeb nkab tsim raucryogenic thiab kev pabcuam tseem ceeb, ua raws li ASTM A671 tus qauv.
Qib: CC65 ua(tswj chemistry: Tsawg dua lossis sib npaug rau 0.30% C, Tsawg dua lossis sib npaug rau 1.00% Mn, Si, P, S txwv).
Chav kawm: 42(cov chav kawm siab tshaj plaws hauv A671 CC65 series, tshaj Chav Kawm 41).
2. Ntsiab Specifications & Properties
Tensile zog: Ntau dua lossis sib npaug ntawm 65 ksi (448 MPa) nrog lub zog tawm los Ntau dua lossis sib npaug rau 35 ksi (241 MPa).
Kev sim cuam tshuam: Yuav tsum tau ntawm-50 ° F (-45 ° F)lossis qis dua (raws li ASTM A671 Appendix X5).
Vuam: 100% radiography (RT) lossis kuaj ultrasonic (UT) + post-weld heat treatment (PWHT) yog xav tau.
3. Cov ntawv thov tseem ceeb
Roj & Roj: LNG terminals, subzero pipelines, thiab siab -pas kis tau tus mob.
Zog: Nuclear/power plant coolant systems nyob rau hauv cheeb tsam txias.
Kev lag luam: Cryogenic cia tanks thiab Arctic structural Cheebtsam.
4. Sib piv nrog Cov Qib qis (30-41)
| Parameter | Chav Kawm 42 | Chav Kawm 30-41 |
|---|---|---|
| Tsim Siab | Siab tshaj(~ 500 psi) | 300-450 psi |
| NDT Requirements | 100% RT/UT + PMI + PWHT | RT/UT ib nrab rau cov chav kawm qis |
| Impact Test | -50℃F los yogqis(kev cai) | -20 ° F txog -50 ° F |
5. Kev xeem & ntawv pov thawj
Hydrostatic Test: 1.5x tsim siab (min 10 sec tuav).
Daim ntawv pov thawj: Tag Nrho MTRs (chemistry, mechanical tests, NDT, heat treatment records).
Xaiv tau: Charpy V-notch ntawm ntau qhov kub thiab txias, hardness mapping.
