1. ASTM A671 CB70 Chav Kawm 12 yog dab tsi?
TxujQauv: ASTM A671qib siab -qibEFW kav dej raucryogenic thiab elevated - kev pabcuam siab.
Ntsiab nta:
70 ksi (483 MPa) yield zog tsawg kawg nkausntawm-50 ° F (-45 ° F).
Tsim Siab: Mus txog2,500 psi (172 bar)(Kawm 12 ntsuam xyuas).
Kev sim: Tag nrho ua raws li hydrostatic, UT/RT, thiab Charpy V-cov kev ntsuas cuam tshuam.
2. Cov ntawv thov
Roj & Roj:
Siab -cov kav xa hluav taws xob siab (-50℃F txog 300℃F).
Refinery cryogenic txheej txheem piping.
Kev lag luam:
LNG cia thiab thauj systems.
Siab -cov tshuaj tiv thaiv siab (tsis yog-cov xov xwm corrosive).
3. Cov Khoom Siv Khoom & Kev Ntsuas
| Khoom | Kev xav tau | Test Standard |
|---|---|---|
| Yield zog | Ntau dua lossis sib npaug li 70 ksi ntawm-50 ° F (-45 ° F) | ASTM A 370 Cov Lus Qhia Tshwj Xeeb |
| Impact Toughness | Ntau dua lossis sib npaug li 20 ft-lb (27 J) ntawm-50℃F | ASTM A673 (Charpy V) |
| Hydrostatic Test | 2.0x tsim siab (ib chav kawm 12) | ASTM A671 Tshooj 12 |
| NDT (UT/RT) | 100% weld soj ntsuam | ASTM E 317 (UT), E94 (RT) |
Khoom siv: Feem ntaucarbon{0}}manganese hlaunrog kev xaiv Ni-alloying rau txhim kho cryogenic toughness.
4. Kev tsim khoom & QA
Txheej txheem:
Hluav taws xob fusion vuamnrog yuav tsum tauPWHT (Post-Kev kho cua sov).
normalizingrau grain refinement thiab uniformity.
Daim ntawv pov thawj:
ASME B31.3 thiab B31.8 ua raws.
Kev xaiv thib peb -kev tshuaj xyuas tog (piv txwv li, DNV, ABS).
5. Kev txwv kev ua haujlwm & kev ua raws cai
Qhov kub thiab txias: -50 ° F txog 650 ° F (-45 ° F txog 343 ° F).
Siab txwv: Tsawg dua lossis sib npaug li 2,500 psi (172 bar) rau Chav Kawm 12.
Cov qauv:
ASME B31.3(Process Piping).
TS EN ISO 3183(Pipeline Standards).
