Thaum nws los txog rau cov kav hlau, A252 Qib 3 cov kav hlau steel sawv tawm ua thawj qhov kev xaiv hauv ntau qhov kev lag luam.Cov yeeb nkab no, tseem hu ua spiral submerged arc welded yeeb nkab (SSAW), kauv seam welded yeeb nkab, los yog API 5L kab yeeb nkab, muaj ntau yam zoo uas ua rau nws muaj kev xaiv nrov rau ntau yam ...
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