Most Wall hanger swords are made of stainless steel. Stainless steel is the combination of Carbon steel, nickel and chromium. The combination of these materials in various quantities can result in a wide range of stainless steels. The result is a hard and durable alloy.
One of the advantage of Stainless steel is that the combination of theses materials transforms iron into a much less reactive metal. If you are a sword collector, you already know that stainless steel is a very common material that is frequently used in the high cutlery today.
Most swords that are sold on the market are made of 420 or 440 stainless steel. Most people think that this type of allow is invulnerable to corrosion. The truth is that no metal is invulnerable, stainless steel simply take more time than carbon steel to show the evidence of corrosion.
So although it is true that stainless steel swords requires much less maintenance than carbon steel swords, you still need to take good care of them in order to keep them in good shape.
IMPORTANT: Keep in mind that stainless steel swords even though some are sharpened, are not considered functional swords. They cannot be used in combat or cutting exercises.