1. Q: Dab tsi yog qhov corrosion kuj ntawm JIS G3444 STK490 welded yeeb nkab?
A:JIS G3444 STK490 yog cov pa roj carbon steel yeeb nkab uas txwv tsis pub muaj kev tiv thaiv corrosion; Nws yog feem ntau tiv thaiv los ntawm coatings zoo li galvanizing los yog pleev xim rau cov qauv siv nyob rau hauv corrosive ib puag ncig.
2. Q: Txoj kab uas hla txoj kab uas hla tau teev tseg rau EN 10219 S275JOH welded yeeb nkab li cas?
A:EN 10219 qhia txog txoj kab uas hla ntawm qhov ntev raws li cov yeeb nkab loj; rau S275JOH, sab nraud txoj kab uas hla yog feem ntau ± 1% lossis ± 0.5 hli, nyob ntawm txoj kev tsim khoom thiab kev txiav txim tshwj xeeb.
3. Q: Kev kho cua sov dab tsi yog siv rau API 5L X70 welded yeeb nkab tom qab vuam?
A:API 5L X70 yeeb nkab tej zaum yuav raug xa mus tom qab-weld heat treatment (PWHT) xws li normalizing lossis quenching thiab tempering los txhim kho cov khoom siv, txo cov kev ntxhov siab, thiab txhim kho toughness.
4. Q: Qhov txawv ntawm ERW thiab SAW hauv kev tsim ASTM A53 yeeb nkab yog dab tsi?
A:ERW (Electric Resistance Vuam) siv siab - zaus tam sim no rau vuam seams rau cov kab me me, thaum SAW (Submerged Arc Welding) siv cov dej ntws tawm rau cov kab loj dua. Ob txoj kev tsim cov kav dej ua tau raws li ASTM A53 tus qauv rau lub zog thiab zoo.
5. Q: Dab tsi yog qhov siab tshaj phab ntsa thickness rau API 5L Gr B welded yeeb nkab?
A:API 5L tsis txhais cov phab ntsa siab tshaj plaws; nws nyob ntawm kev tsim muaj peev xwm. Feem ntau muaj xws li Teem caij 40 txog XXS, nrog tuab txog li ob peb ntiv tes rau cov kav loj - txoj kab uas hla.
