1. Q: Sau npe qee cov qhab nia hauv API 5L.
A: Cov qib uas muaj xws li PSL1 qib: A25, A, B, X42, X46, X52, X56, X60, X65, X70; thiab PSL2 qib uas yuav tsum tau nruj dua (piv txwv li, X42R, X65Q).
2. Q: "X42" hauv API 5L X42 txhais li cas?
A: Qhov "X" qhia tias nws yog qib siab -lub zog, thiab tus naj npawb "42" sawv cev rau qhov tsawg kawg nkaus uas tau teev tseg lub zog nyob rau hauv units ntawm 10,000 psi. Yog li, X42 muaj qhov tsawg kawg nkaus lub zog ntawm 42,000 psi (kwv yees li 290 MPa).
3. Q: Qhov txawv ntawm API 5L PSL1 thiab PSL2 yog dab tsi?
A: PSL2 (Product Specification Level 2) muaj cov tshuaj chemical, mechanical, thiab kev xeem yuav tsum nruj dua li PSL1, suav nrog kev tswj xyuas cov pa roj carbon sib npaug rau kev sib tw, kev sib tw hnyav dua, thiab kev sim ntau yam tsis muaj kev puas tsuaj.
4. Q: ASTM A333 yog dab tsi?
A: ASTM A333 npog seamless thiab welded steel yeeb nkab rau qis - qhov kev pabcuam kub, qhov tseem ceeb ntawm qhov tsis zoo.
5. Q: Lub npe hom qib rau qis -kub carbon steel seamless yeeb nkab.
A: ASTM A333 Qib 6 yog qib carbon steel ntau rau kev pabcuam qis rau -45℃(-50℃F).
