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The metallurgical examination of three bronze artifacts from an ancient military fortress found clues revealing the developmental process of a high-tin bronze technology in Korea. Each of them was given a distinctly different treatment, and could chronologically be arranged on the basis of the technical sophistication involved. The most primitive was made exclusively by casting, and the next was given a quench treatment after casting, and the most advanced was hot forged after casting and then quenched. The last was special in that it was excavated near the surface, had thin walls of 0.4㎜ to 1.1㎜, and was made from an unleaded Cu-22 mass % Sn alloy. These traits all demonstrate that the last was made most recently when the high-tin bronze tradition, characterized by the specific alloy composition and the advanced thermo-mechanical treatments, was fully established.
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