1. ASTM A671 CB65 Chav Kawm 20 yog dab tsi?
Txhais:
TxujKhoom siv: ASTM A671hluav taws xob-fusion-welded (EFW) kavrau qhov tsis tshua muaj - kub thiab siab - kev pabcuam siab.
SIB CB65: QhiaQib Bnrog aYam tsawg kawg nkaus lub zog ntawm 65 ksi (448 MPa)thiab txhim kho toughness.
Chav Kawm 20: Cov chav kawm siab tshaj plaws, xav tau100% radiography + kuaj kev puas tsuaj (kev taw qhia khoov, macro-etch)thiabKev kuaj ultrasonic (UT)rau kev soj ntsuam weld.
Qhov Tseem Ceeb:
Tshaj li Chav Kawm 13 hauv kev xeem nruj, tsim los raunuclear, subsea, thiab kev siv cryogenicqhov twg ua tsis tau.
2. Qhov twg yog ASTM A671 CB65 Chav Kawm 20 Yeeb Nkab Siv?
Cov ntawv thov tseem ceeb:
Nuclear zog: Reactor coolant kab, ntim cov hlab ntsha (ASME Section III ua raws).
Subsea Pipelines: High-Kev thauj mus los ntawm hydrocarbon siab (API 17J/ISO 13628).
Cryogenics: LNG cia tanks (-260℃F / -162 degree), kua nitrogen pipelines.
Kev tiv thaiv: Siab -kev nyuaj siab naval thiab aerospace Cheebtsam.
3. Mechanical & Chemical Properties
| Khoom | Kev xav tau | Kev xav |
|---|---|---|
| Yield zog | Ntau dua lossis sib npaug rau 65 ksi (448 MPa) | Ua kom cov qauv kev ruaj ntseg nyob rau hauv siab siab. |
| Tensile zog | 85-110 ksi (586-758 MPa) | Balances lub zog thiab ductility. |
| Charpy V-Ntawv | Ntau dua lossis sib npaug li 40 J ntawm-50 ° F / -45 ° C(los yog qis dua) | Guarantee qis -kub toughness. |
| Carbon sib npaug | Tsawg dua lossis sib npaug rau 0.43% (Pcm mis) | Tiv thaiv weld cracking thaum fabrication. |
Nco tseg: Tag nrho cov kav dej nkagPWHT (Post-Kev kho cua sov)kom tshem tawm cov kev ntxhov siab seem.
4. Kev tsim khoom & Kev Tswj Xyuas Zoo
Fabrication txheej txheem:
Ob npaug -Submerged Arc Vuam (DSAW): Rau longitudinal seams los xyuas kom meej nkag.
Txias Expansion: Txhim kho qhov tseeb qhov tseeb thiab kev cuam tshuam kev ntxhov siab.
Testing Protocol:
100% Radiography + UT: Txheeb xyuas qhov tsis xws luag sab hauv thiab saum npoo.
Kev kuaj puas tsuaj: Kev ntsuas kev taw qhia khoov (ASTM E190), macro-etching rau weld cheeb tsam kev ncaj ncees.
Hydrostatic Test: Pressurized rau2 × tsim siab(piv txwv li, 5,000 psi rau 2,500 psi kev pabcuam).
5. Kev tiv thaiv corrosion & txwv
Txoj kev tiv thaiv:
Cladding: Inconel 625 rau acidic / corrosive kua.
Txheej: 3LPE (3- txheej polyethylene) rau subsea pipelines; FBE (fusion-bonded epoxy) rau faus seem.
Kev tiv thaiv Cathodic: Sacrificial anodes rau offshore installations.
Kev txwv kev ua haujlwm:
Kub: Zam kev siv tsis tu ncua>600℃F (316 degree)vim carbide nag lossis daus.
Kev qaug zog: Yuav tsum tauS-N nkhaus tsom xamrau cyclic loading (piv txwv li, yoj-kev ntxhov siab).
