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Armor:

• 1 ingot - shoulder pad - gloves
• 2 ingots - helmet - boots
• 3 ingots - breastplate - leggings

The multiple items would be made from the same combination of ingots in the same way as the double axe head and the pickaxe head.

You should be able to recycle metal parts by placing them in the ore smelter.

Also about the ore smelter, you should be able to see how much of what is in the smelter with a sign on the side.