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Hunan Standard Steel Seamless Steel Pipe, API 5L Grade B, 30″ NB 750 SCH 40, 12m ? This seamless steel pipe from Hunan Standard Steel Co is manufactured from API 5L Grade B steel. It has a nominal bore of 750, outer diameter of 762mm, and wall thickness of 12.7mm, with a SCH 40 rating. Featuring bevel ends and no coating, it is ideal for heavy-duty industrial applications requiring high strength and dependability.