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Hunan Standard Steel Seamless Steel Pipe, API 5L Grade B, 18″ NB 450 SCH 40, 12m ? Manufactured by Hunan Standard Steel Co, this seamless steel pipe is made from API 5L Grade B steel. Featuring a nominal bore of 450, an outer diameter of 457.2mm, and a wall thickness of 14.27mm, it is rated for SCH 40. This pipe comes with bevel ends and no coating, making it ideal for industrial applications requiring high strength and reliable performance.