1. ASTM A671 CB60 Class 20 steel yeeb nkab yog dab tsi?
A siab -lub zog carbon-manganese EFW yeeb nkabraunruab nrab-rau-siab siab thiab qis- qhov kev pabcuam kub, ua raws liASTM A671-25 Cov khoom siv raw khoom.
CB 60: Carbon -manganese steel (0.25% max C, 1.20% Mn) nrogCharpy cuam tshuam kuaj ntawm -20℃F / -29 degree.
Chav Kawm 20: Yam tsawg kawg nkaus yield zog ntawm20 ksi (138 MPa), bridging kev lag luam thiab kev siv zog.
2. Cov ntawv thov tseem ceeb 2025?
Kev Siv Zog: Nruab nrab-siab cov kab (200–500 psi), geothermal brine piping.
Roj & Roj: Flowlines rau tsis yog -kev pabcuam qaub (ibNACE MR0175-2025).
Hydrogen Economy: Pab piping raugrey hydrogeninfrastructure (tsis yog- ntu tseem ceeb).
3. Kev sib piv rau cov chav kawm qis (piv txwv li, Chav Kawm 12/13)?
Lub zog: 54% siab dua qhov muaj zog dua li Chav Kawm 13 (20 vs . 13 ksi), ua komthinner phab ntsa rau 25% qhov hnyav txuag.
Fabrication: Yuav tsum tauPWHT for thicknesses >0.75 hli (19mm)(ASME B31.3-2025).
Nqi: 20–25% premium tshaj Class 13 (2025 Q4 avg:1,800–1,800–2,200/ton).
4. 2025 Kev Ntsuam Xyuas & Ua Raws Li Kev Hloov Kho Tshiab
NDT: Tag nrho radiography los yogphased -array UTrau tag nrho cov circumferential welds.
Khoom siv Traceability: AI- siv tau MTRsnrog cov cim cim microchip (ISO 10474: 2025 Qib 4).
Sustainability: Tsim nyog rauUS IRA se creditsyog siv nyob rau hauv renewable zog tej yaam num.
5. Kev Muag Khoom & Cov Qauv
Thawj Standard: ASTM A671-25 Cov khoom siv raw khoom(Kawm 20 yuav tsum muaj nyob rau hauv Tshooj 9).
Lwm txoj kev:
TS EN 10217-1 P355TR2(EU, nrog cov cai nruj dua Charpy).
GB/T 5310-2025 20MnG(Tuam Tshoj).
Lub Sijhawm Lead: 14-16 hnubvim kev txhim kho NDT; prioritize mills nrogAPI Q1-2025 ntawv pov thawj.
