1. ASTM A671 CC70 Class 11 yog dab tsi?
Teb:
ASTM A671 CC70 Chav Kawm 11 xaivhluav taws xob-fusion-welded carbon steel kavrauqis-kev pabcuam kub(rated rau-50 ° F / -45 ° C).
Qib CC70: Cov pa roj carbon ntau dua -manganese cov ntsiab lus (C Tsawg dua lossis sib npaug li 0.35%, Mn Tsawg dua lossis sib npaug li 1.20%) dua CC65, ntsuas lub zog thiab weldability.
Chav Kawm 11: QhiaYam tsawg kawg nkaus tawm lub zog ntawm 11 ksi (76 MPa)thiab standardized phab ntsa thickness / siab ntsuas.
Ntsiab StandardASTM A671, ntxiv los ntawm ASME B31.3 rau cov kav dej siab.
Nco tseg: Chav Kawm 11 yog anruab nrab -lub zogkev xaiv rau 低温 daim ntawv thov qhov twg hnyav heev (piv txwv li, -65℃F) tsis tsim nyog.
2. Hom kev siv cov kav dej hauv chav kawm 11?
Teb:
Common siv muaj xws li:
Tub yees Systems: Ammonia / Freon pipelines hauv kev ua zaub mov.
Roj & Roj: Tsawg-siab cryogenic auxiliary kab (tsis yog- tseem ceeb).
Tshuaj Thauj Khoom: Cov kua corrosive me me ntawm qhov kub thiab txias.
Kev cais tawm: Tsis haum rauLNG lossis Arctic pipelines(yuav tsum tau CC65 qib).
3. Cov Khoom Siv Khoom & Cov Kev Ntsuas Cov Khoom Siv?
Teb:
Mechanical Properties:
Yield zog:Ntau dua lossis sib npaug rau 11 ksi (76 MPa).
Tensile zog:60-85 ksi (414-586 MPa).
Kev sim cuam tshuam: Xaiv tau(project-specific; Charpy V-notch at-50 ° F / -45 ° Cyog xav tau).
NDT: Qhov chaw radiography (RT)los yogKev tshuaj xyuas qhov muag (VT)tshwj tsis yog tias siv cov cai nruj dua.
4. Chav Kawm 11 Muab piv rau CC65 li cas (piv txwv li, 70/71)?
Teb:
| Parameter | CC70 Chav Kawm 11 | CC65 Chav Kawm 70/71 |
|---|---|---|
| Temp. Ntau yam | -50 ° F / -45 ° C | -65 ° F / -54 ° C |
| Yield zog | 11 ksi (76 MPa) | 70+ ksi (483+ MPa) |
| Nqi Efficiency | Siab dua (qis alloy cov ntsiab lus) | qis |
| Kev pauv - tawm: Chav Kawm 11 txia kev ua haujlwm cryogenic rau kev txuag nqi hauv cov ntawv thov nruab nrab. |
5. Fabrication & Vuam txoj kev zoo tshaj plaws?
Teb:
Vuam:
Preheat:150-250 ° F (66-121 ° F) for thickness >1 nti (25 mm).
Electrodes:AWS E6010/E7018(tsawg-hydrogen yeem).
Ncej -Kev kho Weld: PWHT tsuas yog tias tau teev tseg (piv txwv li, ntu tuab lossis siab nruj).
Kev tiv thaiv corrosion: Epoxy ximlos yogkub-dip galvanizingrau ib puag ncig me me.
