The reason that it would necessary to coat or protect steel is because it will rust when it comes in contact with water. Steel is mostly iron and will create iron oxide when exposed to water. Stainless steel, however, does not have this problem.
galvanize it, paint it, powder-coat it, electroplate it
you go to your bag select steel coat go down to give and it will have it.
coat
The clear coat that would protect a quadding helmet is the Maxima SC1 Clear Coat.
a coat to protect it from rain
Nitrogen doesn't protect steel from water,
If you are asking about mammals, the fur coat helps protect from sunburns but it does not protect them from the heat of the summer. In fact, having a dense fur coat can cause animals to overheat in the summer if it gets too warm.
epoxy resins
metal coat can evolve scyther into a scissor and an onix into a steelix. but you have to trade them while they are holding the steel coat
trade it with a steel coat
The seed coat in a plant helps protect the embryo from damage and predators.
When held by a Pokémon, the Metal Coat boots the power of Steel-type moves.