1. ASTM A671 CC65 Class20 Steel Pipe yog dab tsi?
Teb:
ASTM A671 CC65 Class20 sawv cev rausiab tshaj -tier hluav taws xob-fusion-welded (EFW) yeeb nkabnyob rau hauv tus qauv A671, tsim rausiab heev thiab kev pabcuam tseem ceeb:
Khoom siv:CC65 carbon steel (min. yield zog65 ksi / 448 MPa)
Chav Kawm 20: 20,000 psi (1,379 bar)Kev ntsuas siab, qhov siab tshaj plaws hauv ASTM A671 series.
Daim ntawv thov:
Ultra-deepwater oil & gas risers (e.g., >3,000m qhov tob)
Nuclear cog thawj cov kab coolant
Hydrogen compression/storage systems (raws li 2025 huv zog tiam sis).
2025 Cov ntsiab lus:Emerging siv nyob rau hauvModular me me nuclear reactors (SMRs)vim nws siab resilience.
2. Dab tsi yog Kev Tsim Khoom & Kev Tswj Xyuas Zoo?
Teb:
Vuam:
Ob -submerged arc vuam (DSAW)nrog100% phased array UT + radiography.
Weld seam hardness tswj kom tsawg dua los yog sib npaug22 HRC(rau NACE MR0175).
Kev kho cua sov:
Quench & tempering (Q&T)Yuav tsum tau ua kom tau zoo microstructure thiab kev ntxhov siab nyem.
Qhov Loj:
24" mus rau 144" OD, phab ntsa mus txog80 hli(rau ASME B36.10M).
Ntsiab Lus:Class20 xav tauxoom slag suav nrogHauv welds (raws li ASTM E45).
3. Chav Kawm 20 piv rau lwm chav kawm li cas?
Teb:
| Chav kawm | Kev ntsuas siab | Qhov Tseem Ceeb |
|---|---|---|
| Chav Kawm 13 | 13,000 psi | Sour kev pabcuam tsom |
| Chav Kawm 20 | 20,000 psi | Nuclear / UHP hydrogen |
| Chav Kawm 22 * | 22,000 psi | (Tshaj tawm rau 2026, raws li ASTM tshuaj xyuas) |
Kev pauv - tawm:Chav Kawm 20'sphab ntsa tuab nce qhov hnyav li ~ 15%vs. Class13, xav tau tshwj xeeb tuav.
4. Qhov Kev Xeem & Ntawv Pov Thawj Yuav Tsum Tau Li Cas?
Teb:
Kev kuaj:
Hydrostatic xeem ntawm 30,000 psi (1.5x tsim siab).
Charpy cuam tshuam ntawm -76℃F (-60 degree)rau cryogenic/cryo- compressed hydrogen service.
Kev xeem HIC/SSC(NACE TM0284/TM0177) rau cov roj qaub sib xyaw.
Ntawv pov thawj:
EN 10204 3.2 + NACE MR0103rau cov ntaub ntawv traceability.
ASME Sec. III Sib. 1ntawv pov thawj rau kev siv nuclear.
Regulatory Note:Class20 kav rau hydrogen yuav tsum ua raws liISO 11114-4: 2025embrittlement pib.
5. Kev txiav txim siab txog qhov project 2025-2026 tseem ceeb yog dab tsi?
Teb:
Kev tiv thaiv corrosion:
Cladding nrog Inconel 625rau acidic/CO₂- ib puag ncig nplua nuj.
Logistics:
Yuav tsum taumodular fabricationvim thauj hnyav txwv.
Emerging Standards:
Saib xyuasAPI 5LD (2026 Draft)rau UHP clad yeeb nkab hloov tshiab.
Tswv yim Pro:Rau cov haujlwm SMR, qhia meejPIB 323-2025seismic kev ua tau zoo xav tau.
