Decided to drill the pipe. Its wall is about 3 mm. There is no red-hot, ordinary pipe. Moreover, I drilled, in fact, not a tube, but one of its walls (see photo). I started with the central hole, drill 5mm. Photo result. Two other holes drilled 5.5mm. this drill held up. Turnovers were about 1500, like the norms for steel and such a diameter.
I wanted to add some photos to my review to visually showcase my experience.
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