: The official place to find German standards, including DIN 17742, is the DIN website. You can visit www.din.de and use their search function to look for DIN 17742. They may offer a preview and/or a purchase option for the standard.
Note: The actual standard includes material‑specific stress correction factors (e.g., Wahl factor). din 17742 pdf
Standards evolve. The current active version of DIN 17742 is (issued July 2002). An older version (e.g., 1972 or 1988) may contain: DIN 17742 PDF: The Complete Guide to Nickel-Iron