1. Q: Qhov txawv ntawm PSL1 thiab PSL2 hauv API 5L yog dab tsi?
A:PSL2 muaj cov kev xav tau nruj dua li PSL1, suav nrog kev tswj cov tshuaj lom neeg nruj dua, muaj zog dua (Charpy impact test), yuav tsum tau kuaj hydrostatic, thiab nruj dua tsis yog{2}}kev kuaj xyuas ntawm welds.
2.Q: Dab tsi yog qhov teeb meem tshwm sim thaum vuam galvanized steel yeeb nkab?
A:Zinc fumes yog tshuaj lom, thiab zinc txheej tuaj yeem ua rau vuam porosity, tsis muaj fusion, thiab tawg. Cov zinc yuav tsum tau muab tshem tawm ntawm qhov chaw vuam ua ntej vuam.
3. Q: Dab tsi yog tus qauv npog cov yeeb nkab rau kev tiv thaiv hluav taws (sprinklers)?
A:ASTM A795 npog dub thiab galvanized steel yeeb nkab rau kev tiv thaiv hluav taws, uas yog qhov tseem ceeb A53 lossis A135 yeeb nkab nrog cov kev xav tau ntxiv rau threading thiab cim.
4. Q: Dab tsi yog qhov tseem ceeb ntawm "S" hauv qib zoo li S355JR?
A:S355JR yog cov qauv steel qib ib EN 10219 (rau hollow seem), tsis yog cov yeeb nkab spec. "S" sawv cev rau "Structural Steel," 355 yog qhov minyield zog hauv MPa, thiab JR qhia tias Charpy cuam tshuam lub zog ntawm chav tsev kub.
5. Q: Ua li cas lub zog ntawm EN 10217-1 P235GH piv rau ASTM A106 Gr. B?
A:Ob leeg yog rau lub hom phiaj siab. P235GH muaj qhov tawm los ntawm 235 MPa, thaum A106 Gr. B yog 240 MPa, yog li lawv zoo sib xws hauv lub zog.
