1. ASTM A671 CJB115 Class 50 Steel Pipe yog dab tsi?
Teb:
ASTM A671 CJB115 Chav Kawm 50 yog asab saum toj-tier hluav taws xob-fusion-welded (EFW) carbon steel yeeb nkabengineered rauheev-siab thiab ultra-siab- kev nyuaj siab(Kev pabcuam kub siab dua lossis sib npaug rau **-20℃F /-29℃**). Lub npe "Class 50" qhia txog aTsawg tshaj tawm lub zog ntawm 50 ksi (345 MPa), muab tso rau ntawm qhov kawg ntawm CJB115 series rau kev lag luam tseem ceeb.
2. Cov khoom tseem ceeb?
Teb:
Mechanical:
Yield zog:Ntau dua lossis sib npaug rau 50 ksi (345 MPa)
Tensile zog:140-160 ksi (965-1,103 MPa)
Impact Test:Yuav tsum Charpy V-notchntawm kev khiav hauj lwm kub
Tshuaj:
Cov pa roj carbon (C):0.35–0.42%(zoo rau ultra-lub zog siab)
Manganese (Mn):1.60–1.90%(hloov hardenability)
P/S: Tsawg dua lossis sib npaug li 0.010%(kev tswj nruj impurity)
3. Cov ntawv thov zoo li cas?
Teb:
Subsea roj & roj Christmas ntoo(30, 000+ psi)
Nuclear reactor thawj lub voj voog
Space launch tsheb hydraulic systems
Tub rog- qib siab cov nkoj
4. Nws Li Cas Piv rau Chav Kawm 45 thiab Chav Kawm 55?
Teb:
| Chav kawm | Yield zog | Qhov tseem ceeb Advantage |
|---|---|---|
| Chav Kawm 45 | 45 ksi (310 MPa) | Siab -siab tshwj xeeb |
| Chav Kawm 50 | 50 ksi (345 MPa) | Qhov kawg siab thiab qaug zog kuj |
| Chav Kawm 55 | 55 ksi (379 MPa) | Kev cai ultra-siab-kev ua tau zoo |
5. Fabrication & Certification?
Teb:
Vuam:
Preheat:550℃F min. + PWHT(1300-1400 ° F)
Kev tshuaj xyuas:100% phased-array UT + radiography
Kev sim:
Hydrostatic:5.5x tsim siab
Fracture mechanics kuaj(CTOD/J-integral)
Ntawv pov thawj: ASME Section III Class 1 + NQA-1 nuclear compliance
