1. ASTM A671 CH115 Chav Kawm 43 yog dab tsi?
Teb: A carbon steel yeeb nkabtsim los ntawmhluav taws xob - fusion vuam (EFW), tsim rauultra-siab- siab thiab kev pabcuam cryogenic(-50 ° F / -45 ° C).
TSI 115: Qhia meej txog kev txhim kho Mn/Si cov ntsiab lus thiab tswj cov impurities (S/P Tsawg dua lossis sib npaug li 0.025%) rau qis- qhov kub thiab txias.
Chav Kawm 43: Hydrostatic xeem siab ntawm43,000 psi, qhov siab tshaj plaws hauv ASTM A671 Class series.
2. Cov ntawv thov ib txwm?
Teb:
Subsea roj/gas pipelines(dej tob siab -ib puag ncig siab).
LNG cia / thauj(cryogenic tso tsheb hlau luam, thauj khoom caj npab).
Nuclear fais fab systems(thaum thawj coolant loops nyob rau hauv huab mob).
3. Qhov Tseem Ceeb Qhov txawv ntawm Chav Kawm 42 lossis qis dua?
Teb:
Lub peev xwm siab: Chav Kawm 43 (43,000 psi) > Chav Kawm 42 (42,000 psi) > Chav Kawm 22 (22,000 psi).
Khoom siv nruj: Kev soj ntsuam nruj dua (-50℃F Charpy V-notch) thiab 100% radiographic tshuaj xyuas (RT).
4. Mechanical & Chemical Properties?
Teb:
Tensile zog: Ntau dua lossis sib npaug rau 70 ksi (485 MPa).
Yield zog: Ntau dua lossis sib npaug rau 40 ksi (275 MPa).
Chemistry: C Tsawg dua los yog sib npaug rau 0.30%, Mn Tsawg dua lossis sib npaug rau 1.35%, Si Ntau dua lossis sib npaug li 0.10% (zoo rau weldability thiab toughness).
5. Quality Assurance & Standards?
Teb:
Kev sim: Hydrostatic + RT + ultrasonic kuaj (UT, yog tias teev).
Daim ntawv pov thawj: MTRs (Mill Test Reports) nrog cov lej ntsuas kub.
Ua rawsASTM A671 (cov khoom siv) + ASME B31.3 (kev teeb tsa).
