Kwintsimi ye-oyile yokugaya kunye ne-oyile kakuhle, i-high-frequency electric resistance welded casing (ebizwa ngokuba yi-ERW casing) xa kuthelekiswa necasing engenamthungo kukuchaneka okuphakamileyo, ukuqina kwe-weld, anti-extrusion ye-high-performance, kunye neenzuzo zexabiso eliphantsi. isetyenziswa kakhulu kumazwe angaphandle...
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