1. Dab tsi yog ASTM A671 CH115 Chav Kawm 70?
A:Nws sawv cev rausiab tshaj -qib EFW carbon steel yeeb nkabnyob rau hauv A671 tus qauv, engineered rauhuab cua siab thiab kev pabcuam cryogenic:
- CH115 Chemistry: C Tsawg dua lossis sib npaug li 0.30%, Mn Tsawg dua lossis sib npaug li 1.80% nrog micro-alloying (Nb/V/Ti) rau kev ua kom cov nplej.
- Chav Kawm 70: Yam tsawg kawg nkaus70 ksi (483 MPa) yield zog, xav tauquench & temper (Q&T) kev kho cua sovrau qhov zoo tshaj plaws toughness.
- Ntsiab Feature: Ua tau raws li API 5L PSL2 ntxiv rau kev pabcuam qaub.
2. Chav Kawm 70 feem ntau siv rau qhov twg?
A:Tseem ceeb infrastructure xav tauultra-siab zog thiab qis-kub resilience:
- Deepwater Roj & Roj: Subsea pipelines (piv txwv li, 3,000m qhov tob).
- Cryogenic nroj tsuag: Ua kua hydrogen (-253 degree) ntim tshuab.
- Lub zog tiam: Advanced ultra-supercritical (A-USC) boiler raj (650℃/ 30MPa).
Piv txwv: Siv nyob rau hauv Chevron's Anchor Project (Gulf of Mexico) rau siab -siab lub taub hau.
3. Dab tsi yog nws cov khoom siv tshuab thiab kev xeem?
A:Kev tswj kom zoo:
Nco tseg: Hydrogen-induced cracking (HIC) test per NACE TM0284 yog qhov yuav tsum tau ua rau cov roj qaub qaub.
4. Nws piv rau Chav Kawm 63 li cas?
A:Txhim kho kev ua tau zoo:
- Lub zog: 11% siab dua yield zog (70 vs 63 ksi) rau nyias phab ntsa tsim.
- Fracture Safety: Stricter CTOD (Crack Tip Opening Displacement) kuaj.
- Corrosion Resistance: Txhim kho H₂S kam rau ua los ntawm kev tswj hwm Ceq (tsawg dua lossis sib npaug rau 0.43).
Kev pauv - tawm: 15-20% cov khoom siv ntau dua vim kev ua haujlwm Q&T nyuaj.
5. Cov qauv kev tswj hwm thiab cov qauv yav tom ntej?
A:Kev ua raws cai suav nrog:
- ThawjASTM A 671 + ASME B31.3/B31.8.
- Tawm tshiabAPI 5L PSL3 (2025 cua ntsawj ntshab) rau Arctic pipelines.
- Kev tsim kho tshiab: DNVGL-RP-F119 rau hydrogen transport compatibility.
Tswv yim Pro: Rau kev pabcuam hydrogen, qhia meejhardness Tsawg dua los yog sib npaug rau 22 HRCrau ASME B31.12.
