2026-11-06
Time-Traveler's Guide: Why Ancient Swords Took 100 Foldings—And How to Turn Stinky Coal into Metallurgical Coke and Crucible Steel in One Melt
Time-Travel Core Tech Reconstruction Series #10. In the pre-industrial world, cast iron (>2.5% carbon) was too brittle for swords or cannons, while wrought iron (<0.05% carbon) bent on impact. Worse, smelting with raw coal introduced sulfur, causing catastrophic 'hot shortness.' Here is how to build a beehive coking oven and a Huntsman-style kaolin-graphite crucible furnace to pour homogeneous 0.8% high-carbon steel.
