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1.Standard: GB/T 20065-2006 ,ASTM A722 2.Material:40Si2MnV 3.Diameter: 15-75mm ...
API 5 1/2 J/K55 N80 casing coupling BC/LC oil pipe coupling clamp casing collar stan...
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LSAW (Longitudinal Submerge-arc Welded) steel pipe DSAW (Double Submerged arc welde...
New Longitudinal Seam Welder - Various lengths from 600mm, 900mm, 1200mm and 1800mm -...
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