Is Hagane Orchestra hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV · 2016 · 12 episodes · PG-13 - Teens 13 or older
Adventure, Comedy, Parody, Strategy Game
A group of young girls make a living by running an armored vehicle customization workshop in a desert town. They discuss different ways of promoting their business every day. (Source: ANN)
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