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Hunan Standard Steel Seamless Steel Pipe, API 5L Grade B, 12″ NB 300 SCH 40, 12m ? This seamless steel pipe, produced by Hunan Standard Steel Co, is made from API 5L Grade B steel. Featuring a nominal bore of 300, an outer diameter of 323.8mm, and a wall thickness of 10.31mm, this pipe is rated for SCH 40. With bevel ends and no coating, it is designed for heavy-duty industrial applications requiring robust strength and reliability.