This item is acquired in-game. See its sources below.
An Uncommon Plate Waist, item level 40, binds when picked up.
First seen in build 12.0.7.68887 (Midnight (patch 12.0.7)).
In the Appearances collection, Foundry-Fired Plate Girdle is listed as Quest. Appearance ID: 22226. 3 other items wear the same appearance:
Read from the World of Warcraft client build files.
4 quests list Foundry-Fired Plate Girdle among their rewards in Blizzard's quest data.
Steamburst Cord, 
Wildwood Wrangler Belt, 
Overgrowth Cutter BeltSteamburst Cord, Wildwood Wrangler Belt, Overgrowth Cutter BeltSteamburst Cord, Wildwood Wrangler Belt, Overgrowth Cutter BeltSteamburst Cord, Wildwood Wrangler Belt, Overgrowth Cutter BeltRead from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Foundry-Fired Plate Girdle suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Foundry-Fired Plate Girdle uses icon file 947373, which 16 other items also use. The 4 closest by item ID:
Sha'tari Keeper Girdle ID 112533 · Armor - Plate · item level 42Ruby Plate Girdle ID 114278 · Armor - Plate · item level 44Karabor Honor Guard Girdle ID 107313 · Armor - Plate · item level 40Foundry-Fired Plate Waistguard ID 118034 · Armor - Plate · item level 40Blizzard numbers items as they are created, so the named items next to ID 112612 (112607 to 112617) were usually added in the same batch as Foundry-Fired Plate Girdle: the same quest line, zone, vendor or reward set.
Steamburst Robe ID 112607 · Armor - Cloth · item level 41
Overgrowth Cutter Spaulders ID 112608 · Armor - Leather · item level 40
Foundry-Fired Plate Shoulders ID 112609 · Armor - Plate · item level 40
Steamburst Mantle ID 112610 · Armor - Cloth · item level 40
Wildwood Wrangler Monnion ID 112611 · Armor - Mail · item level 40Steamburst Cord ID 112613 · Armor - Cloth · item level 40Wildwood Wrangler Belt ID 112614 · Armor - Mail · item level 40Overgrowth Cutter Belt ID 112615 · Armor - Leather · item level 40
Steamburst Wristwraps ID 112616 · Armor - Cloth · item level 40
Foundry-Fired Plate Wristwraps ID 112617 · Armor - Plate · item level 40The raw ItemSparse values for item 112612 in the current client build.
Read from the World of Warcraft client build files: Item, ItemSparse, Lock, Holidays, AreaTable and CollectableSourceVendor.
TheWoWDB