Nickel is a primary cost driver for stainless steel and superalloys.
About C276|Hastelloy C-276, same as 276. See 276 for details. The classic universally corrosion-resistant nickel superalloy.
About Round Tube|Hollow cylindrical stock for sleeves, bushings, spacers, and hydraulic cylinders. DOM (drawn over mandrel) tubing machines well and holds tight tolerances. Welded-seam structural tube is for cutting and welding, not precision work.