Weapons and armor on Titan are made from all three of these metals. (See Silver and Cold Iron Weapons for exceptions.)
Bronze
Sages agree that this was THE metal for weapons and armor on Titan thousands of years ago. It was, and still is, widely used by the reptile races and is manufactured by the HzzzSarth (Lizardmen) to this day. Although the reptile races will employ iron and steel when individual weapons are available, they do not manufacture with these metals. Sage speculation as to why bronze remains in wide use generally concludes either tradition (the reptile races seem very reluctant to change their ways) and, more practically, rust. Many reptile tribes live in damp or wet areas, or in the case of the Shharguhhhnn (Sea Devils) actually underwater. And in these environments bronze is a much more serviceable metal. Note: Desert dwelling HzzzSarth are more inclined to have weapons of iron or steel, but they still do not manufacture them. Also, some tribes, especially Kobolds make and use weapons of stone, wood and bone unless they are allied and subjugated by the HzzzSarth, n which case they are generally equipped with bronze. Iron
According to the Sages, iron weapons (NOT Steel) were introduced to humans of Titan by the Goblins. Iron is still widely used by humans, Goblins and even Dwarves, for small items (hinges, hand tools, pots, pans, etc. Weapons have largely been replaced by steel even among the Goblins. Though tougher then bronze, iron is still soft compared to steel and most older weapons and armor of iron were long ago melted down for raw materials in making steel.Steel
According to Dwarven history, it was the Dwarves who developed steel ages ago, he Elves stole the secret, and the Dwarves who taught humans how to make it. Naturally the Elves dispute the origin and theftportion of this, but do agree that it was the Dwarves who taught mankind how to make it.
Dwarven vs Elven
Dwarven steel
Dwarven steel is known for its lightness and being rust proof. It makes for armor a third lighter then the human made (book value) equivalent. Though Dwarves shared the methods of making steel with human smyths long ago, they have never shared all their secrets and techniques. But they do sell Dwarven steel, weapons and armor to humans. Note: Dwarves also sell what is considered ‘munition grade’ armor, weapons and raw metal to human customers (usually those outfitting armies.) This is essentially the same as human made gear. It is not lighter or rust proof, though it is well made. Dwarven techniques make large scale production of such things fast and cheap.Elven steel
Like its Dwarven counterpart, Elven steel is light weight and rustproof. And like the Dwarves they do not share the techniques of manufacture. Unlike the Dwarves they DO NOT sell or trade their metals or products. Nor do they manufacture it in quantity. One of its defining characteristics is that it is easily enchanted and it does not interfere with spell casting in any way. Which steel is better, Dwarven or Elven, is a bone of contention between the two races and a subject of debate among sages, nobles, mercenaries, wizards and adventurers, most of whom have a personal favorite.Human steel
Most human steel is made at a handful of sites scattered around Solista and Palador. Your village or town smith cannot make steel in the local foundries. They can, and do, make iron (used for a lot of day to day items) and most can work steel if they can obtain it. (Dwarves ‘poo-poo’ the quality of MOST human steel, saying that it is, at its best, munition grade. Elves usually don’t comment but have been known to buy limited quantities of quality human steel for use in tools, arrow heads, etc.) Even the Dwarves concede that there are human craftsmen (not many) who can make exceptional weapons and armor using some of the better human made steel. This is done with months of working and reworking the material, using their own techniques (or perhaps secretly learned) to temper and enhance the results.According to Elven and Dwarven histories, the humans they first encountered used crafted stone, wood and bone for weapons and tools. This is still the case in some remote, isolated areas of Titan.