Alleima 3R60 hydrogen tube features: We can provide 3R60 seamless tubes with cold and BA bright annealing finishes that can be used at a maximum working pressure of 20,000 psi. The outside diameter is 6-38.1 mm (0.24-1.5 inches). Alleima 3R60 is an austenitic chromium-nickel steel with a minimum of 2.5% molybdenum and low carbon. The nickel content is guaranteed to be at least 12.5% and the nickel equivalent (Ni-eq) is guaranteed to be at least 28.5%. Alleima 3R60 shows superior resistance to