48207 by Midland | Schedule 40 Welded Nipple | 3" Diameter x 6" Length | 304 Stainless SteelFeatures: The basic alloy. Type 304 (18 8) is an austenitic steel possessing a minimum of 18% chromium and 8% nickel, combined with a maximum of 0. 08% carbon. It is a nonmagnetic steel which cannot be hardened by heat treatment, but instead. must be cold worked to obtain higher tensile strengths. In the marine environment, because of it slightly higher strength and wear resistance than type 316 it is also used for nuts, bolts, screws, and other