This item is acquired in-game. See its sources below.
A Rare Plate Chest, item level 41, binds when picked up.
First seen in build 12.0.7.68887 (Midnight (patch 12.0.7)).
In the Appearances collection, Foundry-Fired Plate Chestplate is listed as Quest. Appearance ID: 22228. 2 other items wear the same appearance:
Read from the World of Warcraft client build files.
4 quests list Foundry-Fired Plate Chestplate among their rewards in Blizzard's quest data.
Wildwood Wrangler Vest, 
Overgrowth Cutter Vest, 
Steamburst RobeWildwood Wrangler Vest, Overgrowth Cutter Vest, Steamburst RobeWildwood Wrangler Vest, Overgrowth Cutter Vest, Steamburst RobeWildwood Wrangler Vest, Overgrowth Cutter Vest, Steamburst RobeRead 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 Chestplate 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 Chestplate uses icon file 947376, which 20 other items also use. The 4 closest by item ID:
Sha'tari Keeper Chestplate ID 112509 · Armor - Plate · item level 42Slavebreaker Chestguard ID 112443 · Armor - Plate · item level 39Lightly Perforated Chestplate ID 113151 · Armor - Plate · item level 40 "Drafty in a way that isn't reassuring."Ruby Plate Breastplate ID 114253 · Armor - Plate · item level 40Blizzard numbers items as they are created, so the named items next to ID 112588 (112583 to 112593) were usually added in the same batch as Foundry-Fired Plate Chestplate: the same quest line, zone, vendor or reward set.
Halaani's Wisdom Tooth ID 112583 · Armor · item level 42
Teroclaw Feather Necklace ID 112584 · Armor · item level 42
Ra'tok's Throatguard ID 112585 · Armor · item level 42
Riverbeast Femur ID 112586 · Weapon - One-Handed Mace · item level 42
Riverbeast Tusk Shank ID 112587 · Weapon - Dagger · item level 42Wildwood Wrangler Vest ID 112589 · Armor - Mail · item level 41Overgrowth Cutter Vest ID 112590 · Armor - Leather · item level 41
Foundry-Fired Plate Warboots ID 112591 · Armor - Plate · item level 41
Steamburst Treads ID 112592 · Armor - Cloth · item level 41
Wildwood Wrangler Sabatons ID 112593 · Armor - Mail · item level 41The raw ItemSparse values for item 112588 in the current client build.
Read from the World of Warcraft client build files: Item, ItemSparse, Lock, Holidays, AreaTable and CollectableSourceVendor.
TheWoWDB