Drilling into drywall with (steel?) studs

[Inka54]

I plan to install a tall cabinet from Ikea called Enhet. It will weigh up to 40 - 50 kg when the door is mounted along with the shelves.

The interior requires it to be wall-mounted, otherwise it will look odd. I have bought plugs and screws and drilled holes with a drill size of 8. One side was no problem, but on the other side, I encountered what I assume is a steel stud. I have tried a drill for steel but I can't get further in than about 4 cm. I am hesitant to press too hard in case I risk damaging something.

At the hardware store, I was advised to drill a hole, apply glue in the hole, insert the plug, and let it dry thoroughly before attaching the screws. Since I can't get further than 4 cm on one side, I wonder if I can use a shorter plug (if such exist) where the stud is. Or is there a high risk that the whole setup will collapse then? The cabinet will also be anchored at the bottom.

Picture of the drill hole.

 

[El-Löken66]

Never seen anything like it. If it were a metal stud, you could just drill through with a 1-2mm drill and then use self-tapping screws.

Don't you have a stud finder to see the direction up and down?

Mostly to make sure what you're drilling into.

An alternative might be an angle iron in a suitable place, depending on what the purpose is, but a little to the side so you get away from the metal.

 

[Inka54]

Never seen anything like it.
If it were a metal stud, you could just drill through with a 1-2mm drill bit and then use a self-drilling screw.

You don't have a stud finder to see the stretch upwards and downwards?

Mostly so you're sure what you're drilling into.

An alternative might be an angle iron in a suitable place, depending on what the purpose is, but a little to the side so you move away from the metal.

Never seen anything like it.
If it were a metal stud, you could just drill through with a 1-2mm drill bit and then use a self-drilling screw.

You don't have a stud finder to see the stretch upwards and downwards?

Mostly so you're sure what you're drilling into.

An alternative might be an angle iron in a suitable place, depending on what the purpose is, but a little to the side so you move away from the metal.

I have a cheap version of a stud finder that shows how the stud runs. Unfortunately, it doesn't show what kind of material the stud is made of. But angle iron could be a solution. I'll check if that would work. Thanks for the quick response!