This is the gotwarcraft Blacksmith leveling guide, for the approximate materials required to complete this massive journey (or not so much with strategic auction house usage,) check at the bottom of the page.

This is a compact overview to increase your blacksmithing skill to the skill cap. For an in-depth blacksmithing guide, including gold-making opportunities, please take a look at this WoW profession guide.

1-75
1 - 25
Rough Sharpening Stones (1 x Rough Stone) x 50
25 - 45
Rough Grinding Stones (2 x Rough Stone) x 20
45 - 75
Copper Chain Belt (6 x Copper Bar) x 30

75-150
75 - 80
Coarse Grinding Stones (2 x Coarse Stones) x 10
80 - 100
Runed Copper Belt (10 x Copper Bar) x 20
100 - 105
Silver Rod (1 x Silver Bar, 2 x Rough Grinding Stone) x 5
105 - 125
Rough Bronze Leggings (6 x Bronze Bar) x 20
125 - 150
Heavy Grinding Stone (3 x Heavy Stone) x 50

150-215
150 - 155
Golden Rod (1 x Gold Bar, 2 x Coarse Grinding Stone) x 5
155 - 165
Green Iron Leggings (8 x Iron Bar, 1 x Heavy Grinding Stone, 1 x Green Dye) x 10
165 - 185
Green Iron Bracers (6 x Iron Bar, 1 x Green Dye) x 20
185 - 200
Golden Scale Bracers (5 x Steel Bar, 2 x Heavy Grinding Stone) x 15
200 - 210
Solid Grinding Stone (4 x Solid Stone) x 20
210 - 215
Golden Scale Bracers (5 x Steel Bar, 2 x Heavy Grinding Stone) x 5

215-300
215 - 235
Steel Plate Helm (14 x Steel Bar, 1 x Solid Grinding Stone) x 20
235 - 250
Mithril Coif (10 x Mithril Bar, 6 x Mageweave Cloth) x 15
250 - 260
Dense Sharpening Stones (1 x Dense Stone) x 20
260 - 270
Armorsmiths:
Earthforged Leggings (16 x Mithril Bar, 2 x Core of Earth) x 10
Weaponsmiths:
Light Earthforged Blade (12 x Mithril Bar, 4 x Core of Earth) x 10 - Swordsmith
Light Emberforged Hammer (12 x Mithril Bar, 4 x Heart of Fire) x 10 - Hammersmith
Light Skyforged Axe (12 x Mithril Bar, 4 x Breath of Wind) x 10 - Axesmith
270 - 295
Imperial Plate Bracers (12 x Thorium Bar) x 25
295 - 300
Imperial Plate Boots (18 x Thorium Bar) x 5

300-360
300 - 305
Fel Weightstone (1 x Fel Iron Bar, 1 x Netherweave Cloth) x 5
305 - 320
Fel Iron Plate Belt (4 x Fel Iron Bar) x 15
320 - 325
Fel Iron Plate Boots (6 x Fel Iron Bar) x 5
325 - 330
Lesser Rune of Warding (1 x Adamantite Bar) x 10
330 - 335
Fel Iron Breastplate (10 x Fel Iron Bar) x 5
335 - 340
Adamantite Cleaver (8 x Adamantite Bar) x 5
340 - 345
Lesser Rune of Shielding (1 x Adamantite Bar) x 10
345 - 350
Adamantite Rapiers (12 x Adamantite Bars) x 5
350 - 360
Adamantite Weightstone (1 x Adamantite Bar, 2 x Netherweave Cloth) x 20

360-375
Aldor:
360 - 370
Flamebane Gloves (8 x Fel Iron Bars, 4 x Primal Water, 4 x Primal fire) x 10
370 - 375
Flamebane Breastplate (16 x Fel Iron Bars, 6 x Primal Water, 4 x Primal Fire) x 5

Scryers:
360 - 375
Enchanted Adamantite Belt (2 x Hardened Adamantite Bars, 8 x Arcane Dust, 2 x Large Prismatic Shards) x 20

Overall Estimated Required Materials:
1-360

80 x Adamantite Bar
180 x Bronze Bar
230 x Coarse Stone
380 x Copper Bar
20 x Core of Earth
20 x Dense Stone
5 x Gold Bar
30 x Green Dye
190 x Heavy Stone
200 x Iron Bar
90 x Mageweave Cloth
310 x Mithril Bar
45 x Netherweave Cloth
210 x Rough Stone
5 x Silver Bar
80 x Solid Stone
380 x Steel Bar
390 x Thorium Bar
360-375

Aldor

294 x Fel Iron Bar
60 x Primal Fire
70 x Primal Water
Scryers

160 x Arcane Dust
134 x Fel Iron Bar
40 x Hardened Adamantite Bars
40 x Large Prismatic Shards
For a far more detailed guide to Blacksmithing and all the other WoW Professions (including Inscription) snag yourself a copy of Penn's Professions Guide. Not only will you learn how to level the profession as quickly and cheaply as possible, you will also learn how to recoup some of your money through the gold making opportunities offered by your profession(s.)