X42 seamless steel yeeb nkab yog PSL1 qib pipeline steel raws li API 5L tus qauv, uas muaj qhov tsawg kawg nkaus tawm lub zog ntawm 290 MPa (42 ksi) thiab qhov tseem ceeb ntawm kev ua haujlwm zoo. Los ntawm micro-alloying tsim thiab tswj dov thiab txias txheej txheem, cov ntaub ntawv tuav zoo heev cuam tshuam toughness ntawm -20 degree, nrog nws Vickers hardness precisely tswj nyob rau hauv qhov ntau ntawm 220-250 HV. Qhov no ua kom muaj kev tiv thaiv zoo tshaj rau deformation txawm nyob rau hauv txoj kev geological tej yam kev mob. Piv nrog rau cov qauv carbon steel kav, X42 variant nruj me ntsis txwv cov ntsiab lus sulfur kom qis dua 0.015% thiab cov ntsiab lus phosphorus kom tsis pub ntau tshaj 0.025%, ua kom nws tsis kam mus rau hydrogen-induced cracking (HIC).
API 5L Qib PSL1 Yeeb Nkab Tshuaj thiab Mechanical Properties
| Qib | Tshuaj muaj pes tsawg leeg | Mechanical Property | |||||||
| C (Max) | Mn (Max) | P (Max) | S (Max) | TENSILE (Min) | YIELD (Min) | ||||
| Psi X 1000 | Mpa | Psi X 1000 | Mpa | ||||||
| X42 | 0.28 | 1.30 | 0.030 | 0.030 | 60 | 415 | 42 | 290 | |
Dab tsi yog qhov sib txawv bbetween API X42 PSL1 thiab API X42 PSL2
Chemical Composition Control (Stricter Requirements)
| Element | PSL1 | PSL2 | Kev cuam tshuam |
|---|---|---|---|
| Sulfur (S) | Tsawg dua lossis sib npaug li 0.015% | Tsawg dua lossis sib npaug li 0.010% | Txhim khu kev tiv thaiv rau SSC (Sulfide Stress Corrosion) |
| Phosphorus (P) | Tsawg dua lossis sib npaug li 0.025% | Tsawg dua lossis sib npaug li 0.020% | Txo txias brittleness, txhim kho qis -temp toughness |
| Carbon sib npaug (CE) | Tsis xav tau | Formula txwv (eg, CEIIWTsawg dua lossis sib npaug li 0.43%) |
Tswj weld txias cracking susceptibility |
Mechanical Properties (Enhanced Reliability)
| Parameter | PSL1 | PSL2 |
|---|---|---|
| Impact Toughness | Optional (raws li kev thov) | Yuav tsum tau (Charpy V-notch Ntau dua lossis sib npaug rau 27J @ -20 degree) |
| Hardness txwv | Tsis muaj kev txwv tsis sib xws | Tsawg dua lossis sib npaug li 250 HB(≈263 HV) |
| Hydrostatic Test | Factory hydro lossis NDT xaiv | 100% NDT + Hydro Test |
Kev soj ntsuam & Certification (Quality System)
| Yam khoom | PSL1 | PSL2 |
|---|---|---|
| Tsis yog -Kev Ntsuas Kev Puas Tsuaj (NDT) | Kev tshuaj ntsuam xyuas | 100% puv -length automated UT |
| Daim ntawv pov thawj | Basic Hoobkas tsim nyog | nruj QC ntawv pov thawj (piv txwv li ISO 9001) |
| Traceability | Batch qhia | Raws li -pipe traceability |
Daim ntawv thov Scenario
PSL1: Low-pressure onshore pipelines, non-sour service, projects >0℃(tus nqi-zoo).
PSL2: Ib puag ncig tseem ceeb- Cov roj av qaub / roj av (H₂S), cov kav dej hauv qab hiav txwv, thaj chaw Arctic, thaj chaw seismic (kev nyab xeeb- tseem ceeb).
