Here is an unofficial modification port called Metallurgy 4, which will add for you a lot of real and even some fancy metals, unique ways to process them, and of course new types of armor with various additional effects.
How to install Metallurgy 4: Reforged Mod
- Download and install Minecraft Forge
- Download mod
- Do not unzip it, copy to C:\Users\User_Name\AppData\ Roaming\.minecraft\mods