1. ASTM A671 CF65 Class 71 Pipe yog dab tsi?
Teb:
ASTM A671 CF65 Chav Kawm 71 yog ib qhohluav taws xob-fusion-welded (EFW) carbon steel yeeb nkabtsim rauqis- kub thiab siab - kev pabcuam siab(rated rau-65 ° F / -54 ° C).
Txheem:ASTM A671 (EFW kav dej rau kev siv cov hlab ntsha cryogenic).
Qib:CF65 npecarbon steel nrog txhim khu kev tiv thaiv.
Chav Kawm 71:Yam tsawg kawg yield zog ntawm71 ksi (490 MPa).
Cov ntawv thov tseem ceeb:LNG pipelines, cryogenic cia tanks, thiab petrochemical nroj tsuag.
2. Cov khoom vaj khoom tsev & kev xeem yuav tsum tau ua
Teb:
Chemistry:Tsawg- carbon steel (piv txwv li, C Tsawg dua lossis sib npaug li 0.30%, Mn Tsawg dua lossis sib npaug li 1.20%) nrog kev tswj nruj ntawm sulfur / phosphorus (Less dua lossis sib npaug li 0.025%).
Impact Testing:Yuav tsum tau Charpy V- ntsuas qhov ntsuas ntawm-65℃F(tsawg kawg lub zog nqus tau teev).
Vuam:Longitudinal seam welded ntawmSubmerged arc vuam (SAW), feem ntau nrogPWHTrau kev ntxhov siab.
3. Nws txawv li cas ntawm lwm cov chav kawm ASTM A671?
| Feature | CF65 Chav Kawm 71 | CF65 Chav Kawm 70 | CC65 qeb 72 |
|---|---|---|---|
| Yield zog | 71 ksi (490 MPa) | 70 ksi (483 MPa) | 72 ksi (500 MPa) |
| Temp Range | -65℃F rau +650℃F | -65℃F rau +650℃F | -65℃F rau +650℃F |
| Siv dav | Siab -siab cryogenic | General cryogenic | Siab -lub zog cryogenic |
4. Dimensions & Manufacturing Tolerances
Teb:
Qhov Loj Loj:16 "mus rau 120" OD (feem ntau rau - txoj kab uas hla loj).
Phab ntsa Thickness:0.3 "mus rau 2.5" (nws txawv nrog kev tsim siab; Chav kawm 71 feem ntau siv cov phab ntsa tuab).
Tolerances:Ua raws li ASTM A671 Annex A:
OD: ± 1%
Phab ntsa thickness: ± 10%
Kev Ncaj Ncees: Tsawg dua lossis sib npaug li 0.1% ntawm qhov ntev.
5. Cov ntawv thov thiab cov qauv kev lag luam
Teb:
Kev Siv Tseem Ceeb:
LNG Export Terminals(kev thauj cov roj liquefied natural gas ntawm -260℃F).
Refineries(tsawg-kub alkylation units).
Fais fab nroj tsuag(Ammonia / CO₂ tuav tshuab).
Ua raws li:Ua tau raws li ASME B31.3 (Cov Txheej Txheem Piping) thiab API 5L (kev xav tau ntxiv).
