1. ASTM A671 CH115 Chav Kawm 40 yog dab tsi?
Teb:ASTM A671 CH115 Chav Kawm 40 hais txoghluav taws xob-fusion-welded steel kavtsim rauqis- kub thiab siab - kev pabcuam siab.
TSI 115: Qhia cov ntaub ntawv qib (carbon steel nrog cov tshuaj muaj pes tsawg leeg, xws li cov ntsiab lus manganese siab dua).
Chav Kawm 40: Qhia qhov ntsuas siab (40,000 psi hydrostatic test siab).
2. Dab tsi yog cov kev siv ntawm cov kav dej no?
Teb:
Cryogenic ib puag ncig(piv txwv li, LNG terminals, tub yees tshuab).
Roj & roj pipelines(subzero kub tej yam kev mob).
Cov nroj tsuag muaj zog(tsawg-kub dej thauj).
3. A671 CH115 Chav Kawm 40 cov kav dej li cas?
Teb:
Txheej txheem: Hluav taws xob- fusion vuam (EFW) nrog cov hlau muab tub lim, tom qab- vuam cua sov kho (PWHT).
Khoom siv: Carbon steel rooj sib tham CH115 chemistry (piv txwv li, tswj sulfur / phosphorus rau toughness).
Kev sim: 100% radiographic soj ntsuam (RT) thiab hydrostatic kuaj ib chav kawm 40 yuav tsum.
4. Dab tsi yog cov yam ntxwv tseem ceeb ntawm kev siv tshuab?
Teb:Tus nqi zoo rau CH115 Chav Kawm 40:
Tensile zog: Ntau dua lossis sib npaug rau 70 ksi (485 MPa).
Yield zog: Ntau dua lossis sib npaug rau 40 ksi (275 MPa).
Impact Test: Charpy V-notch ntawm -50℃F (-45 degree) kom ntseeg tau tias qhov kub thiab txias ductility.
5. Yuav ua li cas txhawm rau ua raws li kev tswj hwm zoo?
Teb:
Cov qauvASTM A671 (ntau lawm) + ASME B31.3 (kev teeb tsa).
Cov ntawv pov thawj: Mill test reports (MTRs) rau chemistry/mechanical tests.
Kev Tshawb Fawb: Txheeb xyuas qhov ncaj ncees thiab txheej txheej (yog tias tsim nyog) tiv thaiv qhov project specs.
