API 5L Qib B, tseem hu ua L245, yog ib qho API 5L yeeb nkab uas muaj qhov tsawg kawg nkaus tawm los ntawm 245 MPa (35,500 psi). Nws tau muab faib ua ob theem, PSL1 thiab PSL2, thiab muaj plaub lub xeev xa khoom, R, N, Q, thiab M.
Chemical Composition API 5L Qib B PSL1
Mechanical Properties rau API 5L Qib B PSL1 yeeb nkab
Chemical Composition API SL B PSL2
Mechanical Properties rau API 5L B PSL2 yeeb nkab
Kev ntsuas qhov xav tau ntawm API 5L GRB pipeline
1. Tsis yog-Kev kuaj kev puas tsuaj (NDT)
Tag nrho - kev pab them nqiKev kuaj ultrasonic (UT)supplemented los ntawmEddy Tam sim no lossis Magnetic Flux Leakage (EMI / MFL).
Daim ntawv qhia khoom: Ua raws liAPI SPEC 5L 46th Edition, UT kev faib tawm raws liQib L2.
2. Mechanical & Chemical Test
Tensile xeem: ElongationNtau dua lossis sib npaug li 22%, hardnessTsawg dua lossis sib npaug li 22 HRC.
Charpy V-ntiv tes ntsuas ntsuas(tseem ceeb rau qis -temp kev ua haujlwm):
Qhov nruab nrab ntawm peb tus qauvNtau tshaj lossis sib npaug rau 20J ntawm -20 degree(raws li technical encyclopedia reference).
3. Dimensional Tolerances
Sab nraud txoj kab uas hla: ± 0.75% rau ± 1.25%
Phab ntsa thickness: +12.5% / -10%
Tus neeg muag khoom siv technology:"Positive Tolerance Control"Ua kom muaj kev ruaj ntseg cov npoo.
