DIN17155 is replaced with which standard for pipes?
15Mo3 was the designation in DIN 17155, replaced in 1993 by EN 10028-2. At the same time, the name was changed to 16Mo3, maintaining the steel number 1.5415.
DIN 17155 did not define pipes, only plates and strips for elevated temperatures. Seamless tubes for pressure purposes were defined in DIN 17175, meanwhile replaced by EN 10216. Welded steel tubes for pressure purposes are defined in EN 10217.
Above is a snippet.