Every bed makes a noise, regardless of whether it is a wooden bed, a box spring bed or a metal bed. This can have many different causes, for example a loose screw or the slatted frame.
Noises from the bed are caused by friction and it is important to find out where this friction occurs in order to be able to counteract it.
If your metal bed squeaks, you can check if the noise has one of these causes:
It squeaks where the slatted frame rests on the bed frame.
Individual boards of the slatted frame have slipped or broken through.
Screws of the bed have come loose (e.g. where the headboard or footboard are connected to the sides of the bed).
There is too much friction between the slats of a double bed.
The mattress squeaks.