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Hunan Standard Steel Seamless Steel Pipe, API 5L Grade B, 3″ NB 80 SCH 40, 12m ? This seamless steel pipe, made by Hunan Standard Steel Co, is produced from API 5L Grade B steel. With a nominal bore of 80, an outer diameter of 88.9mm, and a wall thickness of 5.49mm, it is rated for SCH 40. The pipe comes with bevel ends, has a 12-meter length, and no coating, making it suitable for industrial applications.