First of all, here's the basic list of forging changes/additions I hope to mod in, explaining the respective weapon/armour grades for various metals. I'll be expanding on this list, and using it as a reference.
20 = Gold, Rose Gold, Bismuth, Platinum: Note: there's no reason dwarfs shouldn't be able to make weapons or armor from other precious metals, the functionality could be assumed to be more or less the same (very poor), and the possibility of forging weapons/armor made from precious metals would
have it's own coolness factor.
20 = Arsenic (new bar, found in arsenide ore)
20 = Calmia (new bar found in calmian ore, about as rare as silver)
20 = Uranium (new bar, smelted from Uranium ore, which is found in lead. Uranium is about as rare as platinum.)
20 = Rhodium (rarer and more valuable than platinum, found in platinum),
20 = Palladium (found in nickel, worth about as much as gold)
20 = Osmium (found in nickel, worth about as much as gold)
20 = Rhenium (found in rheniite, also found in molybdenum, rarer and more valuable than platinum)
20 = Beryllium (very rare, found in red and golden beryl)
33 = lead, electrum, aluminum, black bronze, corinthian bronze (more valuable than black bronze, formula = 1 copper bar + 2 silver bars + 1 gold bar), silver, the various forms of pewter.
40 = glass, flint/stone, chrome (new bar, 'Chromium' is the ore, about as rare as silver).
50 = Hard wood (maple, oak, walnut, etc.), Shell, Rock Crystal, Molybdenum (Molybdenum is found in molybdenite ore. It is about as rare as platinum).
60 = cobalt (new bar, derived from Cobaltite ore, about as rare as silver), azurite (new bar, derived from Chessylite ore).
66 = Copper, nickel silver, billon, brass, zinc, tin, bone.
70 = Auricupridite (pink, new bar, found in Auric ore, about as rare as platinum)
70 = Black Brass (black, 1 bar of copper, 1 bar of tin, 1 bar of zinc, 1 bar of lead)
75 = Cold Iron (basic iron bar), some extremely hard exotic woods (ebony, lignum vitae, teak, zebrawood, purpleheart, iron wood, hickory, etc.)
80 = Bronze (1 bar of copper, 1 bar of tin), Elven heartwood (specially grown wood), vanadium (new bar, found in Vanadinite ore, which is about as rare as silver, but more valuable).
90 = Pig Iron (1 bar of iron, 1 unit of flux), Titanium (new bar, found in Ilmenite ore).
90 = Red Brass (3 bars of copper, 1 bar of tin, 1 bar of zinc)
90 = Bismuth Bronze
95 = White Bronze (1 bar of copper, 1 bar of tin, 1 unit of ortho)
100 = Nickel (green)
100 = Beryl Copper (red, 1 bar of beryllium, 1 bar of copper)
100 = Wootz Iron (requires 1 bar of iron, 1 bar of pig iron, 1 unit of green glass)
110 = Cast Iron (requires 2 bars of iron, 1 unit of flux)
115 = Auricipride (crimson, requires 2 bars of copper, 1 bar of gold, 1 bar of auricipridite)
120 = Nickel Iron (requires 2 bars of iron, 1 bar of nickel). May occasionally be found in nugget form, about as rare as gold.
120 = Tantalum (blue grey, new bar, found in tantalite, which is found in tin)
125 = Arsenical Bronze (green, requires 3 bars of copper, 1 bar of tin, 1 bar of arsenic.)
130 = Bronzium (bright yellow, requires 2 bars of copper, 1 bar of zinc, 1 bar of tin, 1 bar of calmia).
130 = Tungsten (grey, Tungsten is found in wolframite ore, and is about as rare as platinum)
133 = Steel (1 bar of iron, 1 bar of pig iron, 2 bars of flux)
135 = Red Steel (2 bars of iron, 2 bars of flux, 1 bar of cinnabar)
135 = Blue Steel (2 bars of iron, 2 bars of flux, 1 bar of cobalt)
135 = Auric Bronze (3 bars of copper, 1 bar of tin, 1 bar of calmia, 1 bar of auricipridite)
140 = Black Steel (black, aka high carbon steel, requires 2 bars of iron, 3 bars of flux.)
140 = Patterned Steel (light blue, more valuable form of steel, would require 1 bar of steel, 1 bar of wootz iron)
140 = Mosaic Steel (a more valuable form of Patterned Steel, would require 1 bar of steel, 1 bar of wootz iron, and either 1 bar of cobalt (Blue Mosaic Steel), cinnabar (Red Mosaic Steel), nickel (Green Mosaic Steel), chrome (White Mosaic Steel), or 1 bar of cast iron (Black Mosaic Steel).
140 = Iridium (blue, Iridium is found in iridiosmium, which is found in iron, and is rarer than platinum)
145 = Crucible Steel (dark blue, requires forging and combining 3 bars of Pig Iron)
145 = Immaculate Steel (aka "Stainless Steel", white, requires 1 bar of pig iron, 1 bar of nickel iron, 1 bar of chrome).
150 = Meteor Steel (sky blue, would require 1 bar of nickel, smelted with 1 bar of Crucible Steel, can be found in extremely rare cases, in nugget form, about as rare as platinum or aluminum.
150 = Osmiridium (dark blue, requires 1 bar of osmium and and 1 bar of iridium)
150 = Stellite (silver, would require 1 bar of cobalt, 1 bar of chrome, and 1 bar of tungsten)
160 = Titanite (white, would require 1 bar of titanium smelted with 1 bar of meteor steel)
160 = Talonite (silver, would requre 2 bars of cobalt, 2 bars of chrome, and 1 bar of tungsten)
166 = Beryl Bronze (dark brown, would require 1 bar of beryllium, 2 bars of copper, 1 bar of zinc, and 1 bar of tin)
170 = Julian Steel (would require 1 bar of nickel, 1 bar of cobalt, and 1 bar of tungsten, smelted with 1 bar of Crucible Steel)
Jovian Steel (if possible, Jovian Steel will be the absolute best metal smeltable by humans, except for Orichalcum)
175 = Jovian Steel (would require 1 bar of titanium, smelted with 2 bars of meteor steel)
Deep Steel and Still Steel (the best non-legendary metals in the game)
185 = Deep Steel (dark grey, would require 1 bar of titanium, 1 bar of iridium, and 1 bar of molybdenum, smelted with 2 bars of meteor steel).
185 = Still Steel (silver, would require 1 bar of cobalt, 1 bar of tungsten, and 1 bar of palladium, smelted with 2 bars of meteor steel)
Anything at 200+ will be considered will be considered a "legendary" metal type, meaning it'll be a candidate for special abilities, in combination with other items.
Orichalcum (A metal especially beloved by humans.)
200 = Orichalcum (reddish orange, would require 3 bars of copper, 3 bars of calmia, 1 bar of gold)
Ithildium (as close to Mithril as I'm willing to get, a light, silvery metal that glows in the dark, invented by elves, who are very fond of it)
200 = Ithildium (Silver, requires 3 bars of silver, 1 bar of aluminum, 1 bar of titanium, 1 bar of vanadium, 1 bar of chrome, 1 bar of iridium)
200 = Drak (dark brown, requires 1 bar of rhenium, 1 bar of molybdenum, and 2 bars of nickel)
Starmetal (basically a fantasy version of Mosaic Damascus, on steroids, comes in various colors)
225 = Green Starmetal (would require a bar of titanium, a bar of nickel, a bar of cobalt, a bar of tungsten, a bar of iridium, and a bar of vanadium)
225 = White Starmetal (would require a bar of titanium, a bar of nickel, a bar of cobalt, a bar of tungsten, a bar of iridium, and a bar of chrome)
225 = Red Starmetal (would require a bar of titanium, a bar of nickel, a bar of cobalt, a bar of tungsten, a bar of iridium, and a bar of cinnabar)
225 = Blue Starmetal (would require a bar of nickel, a bar of titanium, a bar of cobalt, a bar of tungsten, a bar of iridium, and a bar of azurite)
225 = Black Starmetal (would require a bar of nickel, a bar of titanium, a bar of cobalt, a bar of tungsten, a bar of iridium, and a bar of uranium)
225 = Gold Starmetal (would require 1 bar of nickel, 1 bar of titanium, 1 bar of cobalt, 1 bar of tungsten, 1 bar of iridium, and 1 bar of gold)
250 = Stygium (deep blue, would require 3 bars of uranium, 3 bars of aluminum, 1 bar of cinnabar, 1 bar of tungsten)
250 = Zeon (golden, improbably rare metal, found in diamond)
275 = Beryllide (crimson, 1 bar of beryllium, 1 bar of titanium, 1 bar of nickel, 1 bar of cobalt, 1 bar of tantalum, 1 unit of red zircon, 1 unit of black zircon)
300 = Auram (bright yellow, would require 3 bars of gold, 1 bar of iridium, 1 bar of auricipridite, 1 bar of copper, and 2 bars of chrome)
300 = Lunite (silver, requires 3 bars of iridium, 1 bar of tungsten, 1 bar of silver, 1 bar of chrome, 1 bar of platinum, 1 bar of lead)
300 = Witch Iron (Most basic alloy of Adamantite, requires 1 bar of adamantite, 1 bar of cold iron, 1 bar of gold.)
325 = Octirion (bright orange, requires 1 bar of copper, 1 bar of gold, 1 bar of bismuth, 1 bar of cinnabar, 1 bar of cobalt, 1 bar of nickel, 1 bar of vanadium, 1 bar of chrome). Discworld inspired.
Merid (simply the best non-adamantium metal available, extremely difficult to make. Was invented by elves and dwarfs working together. Both vehemently deny the other species had anything to do with it, and generally blame it on the humans.)
333 = Merid (white, requires 1 bar of Rhodium, 1 bar of Ithildium, 1 bar of Orichalcum)
350 = Adamantium (same color as adamantite, Alloy of Adamantite, requires 3 bars of bronze, 1 bar of adamantite, 3 bars of cast iron, 1 bar of gold)
400 = Infernium (deep blue, alloy of Adamantite, requires 1 bar of cinnabar, 1 bar of adamantite, 3 bars of cast iron, 1 bar of red steel, 1 bar of blue steel, 1 bar of gold, 1 bar of arsenic)
450 Demondyne (dark purple, alloy of Adamantite, requires 1 bar of cinnabar, 3 bars of lead, 1 bar of adamantite, 3 bars of black bronze, 1 bar of arsenic)
500 = Hell Metal (crimson, alloy of Adamantite, requires 1 bar of cinnabar, 1 bar of uranium, 1 bar of adamantite, 1 bar of auricipridite, 1 bar of bismuth, 1 bar of tungsten, 3 bars of deep steel)
666 = Mountainheart (rose, alloy of Adamantite, requires 3 bars of adamantite, 3 bars of rose gold, 2 bars of deep steel, 1 bar of zeon.)
1000 = Deep Adamant (black, requires 1 bar of adamantite, only available for use in artifacts.)
The formulas for the various metals may have to be refined a bit, for balancing reasons, and so that they make some kind of sense, but this is generally what I have in mind.