1. ASTM A671 CH115 Class 30 Steel Pipe yog dab tsi?
Teb:
ASTM A671 CH115 Chav Kawm 30 yog asiab-kev ua tau zoo hluav taws xob- fusion-welded (EFW) carbon-manganese- silicon steel yeeb nkabtsim rauultra-siab-siab thiab qis- kev pabcuam kub.
"CH115": C-Mn-Si steel qib nrog superior zog thiab toughness.
"Class 30": Qhia txog kev nrujHydrostatic xeem siab ntawm 600 psi, siab tshaj hauv A671 tus qauv.
Cov yam ntxwv tseem ceeb: Yuav tsum tau 100% radiography, Charpy impact testing at -50℃F (-45 degree), thiab post-weld heat treatment (PWHT) for stress relief.
2. Cov khoom siv & tshuaj lom neeg muaj pes tsawg leeg
Teb:
Tshuaj muaj pes tsawg leeg:
Carbon: Tsawg dua los yog sib npaug rau 0.30%, Manganese: 0.50–1.35%, Silicon: 0.15–0.40% (zoo rau weldability thiab lub zog).
Mechanical Properties:
Tensile zog:Ntau dua lossis sib npaug rau 70 ksi (483 MPa).
Yield zog:Ntau dua lossis sib npaug rau 40 ksi (276 MPa).
Impact Toughness:Yam tsawg kawg nkaus 20 ft -lb (27 J) ntawm -50℃F (-45 degree).
Kev tsim khoom: EFW nrogpuv -length normalizationlos xyuas kom meej qhov zoo ntawm microstructure.
3. Cov ntawv thov ib txwm
Teb:
Roj & Roj: High-cov kav xa hluav taws xob siab, cov neeg tawm sab nrauv.
Cryogenics: LNG liquefaction nroj tsuag, kua hydrogen cia.
Fais fab nroj tsuag: Supercritical chav kab, nuclear reactor auxiliary systems.
Kev lag luam: Petrochemical reactors ua haujlwm nyob rau hauv cov xwm txheej hnyav.
4. Chav Kawm 30 txawv li cas ntawm Lwm Chav A671?
Teb:
| Parameter | Chav Kawm 30 | Chav Kawm 23 | Chav Kawm 21 |
|---|---|---|---|
| Kuaj Siab | 600 psi ua | 400 psi ua | 300 psi ua |
| Phab ntsa Thickness | Ntxiv- hnyav (Ntau dua lossis sib npaug rau 1.5") | Hnyav (1.0-1.5 ") | Nruab nrab (0.75-1.25 ") |
| Tsim kom pom tseeb | Siab siab heev | Siab siab | Nruab nrab siab |
5. Cov qauv & ntawv pov thawj
Teb:
Thawj Standard: ASTM A671 (EFW kav dej rau qis-temp kev pabcuam).
Cov qauv xeem:
ASTM A370 (kev ntsuam xyuas tshuab).
ASTM A435 (tag nrho - ntev radiographic tshuaj xyuas).
Tsim Codes: ASME B31.3 / B31.8 (txheej txheem / gas kis piping).
Xaiv tau: NACE MR0175 (kev pabcuam qaub), PED 2014/68/EU (European pressure equipment).
Lus Cim: Rau Chav Kawm 30 cov kav dej, qhia meejkev xav tau ntxivzoo li:
Txhim kho NDE: Ultrasonic kuaj (UT) + magnetic particle kuaj (MT).
Khoom siv Traceability: EN 10204 3.1/3.2 ntawv pov thawj.
