316 Stainless Steel Pipeis the second-most common stainless steel next to304. SS DIN 1.4401 / 1.4436 Rectangular Welded Pipes, ASTM A312 TP316 Pipe, 316 Rectangular tubing, 316 Tubing generally contains 16% chromium and 10% nickel, with the addition of molybdenum normally ranging from 2-3%. ...