1. ASTM A671 CJB115 Class 40 Steel Pipe yog dab tsi?
Teb:ASTM A671 CJB115 Chav Kawm 40 yog asiab -kev ua tau zoo hluav taws xob- fusion-welded (EFW) carbon steel yeeb nkabtsim rauultra- tseem ceeb heev - kev siv siab(kev pabcuam kub saum toj no-20 ° F / -29 ° C). Lub npe "Class 40" qhia tias aYam tsawg kawg nkaus lub zog ntawm 40 ksi (276 MPa), ua rau nws haum rau huab cua siab tshuab.
2. Cov khoom tseem ceeb?
Teb:
Mechanical:
Yield zog:Ntau dua lossis sib npaug rau 40 ksi (276 MPa)
Tensile zog:110-130 ksi (759-896 MPa)
Impact Test:Yuav tsum tau(Charpy V-notch ntawm kev khiav hauj lwm kub)
Tshuaj:
Cov pa roj carbon (C):Tsawg dua lossis sib npaug li 0.35%(optimized rau weldability)
Manganese (Mn):1.35-1.65%(ua kom muaj zog)
P/S: Tsawg dua lossis sib npaug li 0.020%(kev tswj nruj impurity)
3. Cov ntawv thov zoo li cas?
Teb:
Nuclear fais fab nroj tsuag thawj coolant kab
Offshore roj & roj siab -siab risers(10, 000+ psi)
Aerospace hydraulic xeem tshuab
Heavy industrial forging presses
4. Nws piv rau Class 35 thiab Class 45 li cas?
Teb:
| Chav kawm | Yield zog | Qhov txawv tseem ceeb |
|---|---|---|
| Chav Kawm 35 | 35 ksi (241 MPa) | High -siab tus qauv |
| Chav Kawm 40 | 40 ksi (276 MPa) | Ultra-siab- qib siab tshaj |
| Chav Kawm 45 | 45 ksi (310 MPa) | Kev siv tshwj xeeb heev |
5. Fabrication Requirements?
Teb:
Vuam:Preheat (450℃F min.) + PWHT(1200-1300℃F) +100% X- kev tshuaj xyuas kab hluav taws xob
Kev sim:Hydrostatic (3.5x tsim siab) + hardness daim ntawv qhia
Kev tsim: Kub sib sau nkaus xwb(Cold dabtsi yog khoov txwv)
Ntawv pov thawj: Nuclear - cov ntaub ntawv qib(ASME NQA-1)
