UNS N02200/N02201 Hollow Pipe, Nickel Alloy 200 Welded Tubing, ASTM B161 Nickel 201 ERW Pipes, 200 Nickel Seamless Tubing, DIN 2.4066/2.4068 Electropolish Pipe, ASME SB161 Nickel Alloy 201 Seamless Pipes, Grade 201 Nickel ERW Pipes.