1. ASTM A671 CH115 Class 31 Steel Pipe yog dab tsi?
Teb:
ASTM A671 CH115 Chav Kawm 31 sawv cev rausiab tshaj -qib hluav taws xob- fusion-welded (EFW) carbon-manganese- silicon steel yeeb nkabnyob rau hauv tus qauv A671, tsim rautsis tshua muaj - kub thiab ultra- siab - kev pabcuam siab.
"CH115": C-Mn-Si steel nrog optimized chemistry rau cryogenic toughness thiab weldability.
"Klass 31": Xav tau aHydrostatic xeem siab ntawm 900 psi, qhov nruj tshaj plaws hauv A671 series.
Cov yam ntxwv tseem ceeb: Tag nrho -length normalization, 100% radiography + ultrasonic kuaj (UT), thiab yuav tsum tau Charpy cuam tshuam kuaj ntawm-75 ° F (-60 ° C).
2. Cov khoom siv & tshuaj lom neeg muaj pes tsawg leeg
Teb:
Tshuaj muaj pes tsawg leeg:
Carbon: 0.20–0.30%, Manganese: 0.90–1.35%, Silicon: 0.15–0.40% (txhim kho rau qis-kub kev ua haujlwm).
Mechanical Properties:
Tensile zog:Ntau dua lossis sib npaug rau 75 ksi (517 MPa).
Yield zog:Ntau dua lossis sib npaug rau 45 ksi (310 MPa).
Impact Toughness:Yam tsawg kawg nkaus 25 ft -lb (34 J) ntawm -75℃F (-60 degree).
Kev tsim khoom: EFW nrogpost-weld kev kho cua sov (PWHT)thiabua kom txias txiasrau grain refinement.
3. Cov ntawv thov ib txwm
Teb:
Kev Siv Zog: Arctic / subsea roj & roj pipelines, LNG liquefaction terminals.
Lub zog tiam: Advanced ultra-supercritical (AUSC) boiler Cheebtsam.
Aerospace: Ua kua hydrogen / oxygen thauj tshuab.
Nuclear: Lub hauv paus coolant loops nyob rau hauv Gen IV reactors (yog ASME III ua raws).
4. Sib piv nrog lwm cov chav kawm A671
Teb:
| Parameter | Chav Kawm 31 | Chav Kawm 30 | Chav Kawm 23 |
|---|---|---|---|
| Kuaj Siab | 900psi ua | 600 psi ua | 400 psi ua |
| Temp. Kev ntsuas | -75 ° F (-60 ° C) | -50 ° F (-45 ° F) | -50 ° F (-45 ° F) |
| NDE Requirements | RT + UT + MT | RT + UAS | RT |
5. Cov qauv & ntawv pov thawj
Teb:
Thawj StandardASTM A671 (nrog Cov Lus Qhia Ntxiv S6 rau Chav Kawm 31).
Cov qauv xeem:
ASTM A370 (kev ntsuam xyuas tshuab).
ASTM A577 / A578 (Kev kuaj xyuas ultrasonic).
Tsim Codes: ASME B31.3 ( txheej txheem piping), API 5L (kab yeeb nkab compatibility).
Cov ntawv pov thawjNACE MR0103 (kev pabcuam qaub), ISO 3183 (cov kav dej thauj mus los).
Cov ntawv tseem ceeb rau kev yuav khoom:
QhiaTxhim kho NDE raws tu qauv(eg, phased array UT).
Xav tau3.2 cov ntaub ntawv pov thawjRaws li EN 10204.
Paub meejPWHT parameters(piv txwv li, 1100-1250℃F rau 1 teev / nti tuab).
