Well beer cans (up to half liter) are still made from steel over here and i never had any problems cutting them into pieces.
I have noticed edge wear by cutting cat food cans, that are, made of steel too but definatly thicker.
Well, I'm sure beer cans in Europe are made of aluminum. Doesn't matter if it's Hungarian, German, Chech, Danish and Dutch beer.
Let me see... brb
Yupp, it's true. I just checked every can in my fridge with a magnet.

Cat food cans are really made from quite thick steel.