1. ASTM A671 CH115 Class 32 Steel Pipe yog dab tsi?
Teb:
ASTM A671 CH115 Chav Kawm 32 sawv cev rausiab tshaj -tier hluav taws xob- fusion-welded (EFW) yeeb nkabnyob rau hauv A671 tus qauv, engineered rautsis tshua muaj siab -kub (-100℃F/{-}73 degree) thiab ultra-high-pressure (1,200 psi hydrostatic test) kev pabcuam.
Khoom siv: Carbon-manganese-silicon steel (CH115 qib) nrog micro-alloying rau cryogenic toughness.
Cov yam ntxwv tseem ceeb:
Yuav tsum tau100% radiography + automated ultrasonic kuaj (AUT).
Ncej -weld normalization + temperingrau kev ntxhov siab.
Charpy V-qhov cuam tshuam qhov ntsuas ntawm -100℃F (-73 degree).
2. Khoom Specifications & Properties
Teb:
| Khoom | Tus nqi |
|---|---|
| Tshuaj muaj pes tsawg leeg | C Tsawg dua lossis sib npaug li 0.25%, Mn: 1.00-1.60%, Si: 0.15-0.40% |
| Tensile zog | Ntau dua lossis sib npaug rau 80 ksi (552 MPa) |
| Yield zog | Ntau dua lossis sib npaug rau 50 ksi (345 MPa) |
| Impact Zog | Ntau dua lossis sib npaug li 30 ft-lb (41 J) ntawm -100℃F (-73 degree) |
| Kev tsim khoom | EFW nrogpuv -lub cev quenching & tempering |
3. Cov ntawv thov
Teb:
Zog: Arctic / subsea pipelines, LNG cryogenic hloov tshuab.
Aerospace: Ua kua hydrogen/oxygen cia rau qhov chaw tso tsheb.
Nuclear: Reactor containment systems (ASME III compliant).
Kev lag luam: Siab -siab hydrogen thauj (Ntau dua lossis sib npaug li 5,000 psi).
4. Sib piv nrog lwm cov chav kawm
Teb:
| Chav kawm | Kuaj Siab | Min. Temp. | NDE Requirements |
|---|---|---|---|
| 32 | 1,200 psi | -100 ° F (-73 ° C) | RT + AUT + MT |
| 31 | 900psi ua | -75 ° F (-60 ° C) | RT + UAS |
| 30 | 600 psi ua | -50 ° F (-45 ° F) | RT |
5. Cov Qauv & Cov Lus Qhia Txog Kev Muag Khoom
Teb:
Thawj StandardASTM A 671 +Kev Xav Tau Ntxiv S9(Tshwj xeeb 32).
Kev sim:
ASTM A1064 (Kev kuaj ultrasonic)
ASTM E23 (Charpy cuam tshuam ntawm cryogenic temps).
Cov ntawv pov thawj:
NACE MR0175 / ISO 15156 (kev pabcuam qaub).
PED 2014/68/EU Qeb IV.
Kev yuav khoom tseem ceeb:
Traceability: EN 10204 3.2 ntawv pov thawj.
NDE: Phased -array UT rau thaj chaw weld.
Kev kho cua sov: Tswj qhov cua txias tsawg dua lossis sib npaug li 50℃/ min.
