Curated Measured Steel Transformation Datasets with Datum-Level Provenance (Material Simulator)

Curated, machine-readable steel transformation datasets (CCT, TTT, phasefraction, hardness) extracted from peer-reviewed publications and historicalsources, with datum-level provenance: every value carries its exact sourcelocation, extraction method, extraction date, and the original publication'slicense and citation. Part of the Material Simulator project (https://materialsimulator.com),an interactive steel metallurgy education and reasoning-contractplatform. This deposit is a versioned, citable snapshot of the project's"measured tier" — see README.md for the full dataset index and citationguidance. Twenty-four datasets across eight source publications are included,covering grades S960MC, 42C, 42D, 23MnNiCrMo5-3, 54SiCr6, HRB500DW, a leanmedium-Mn Q&P steel, the historical eutectoid "Steel B" from Davenport &Bain (1930), and thirteen grades (1008, 1019, 1034 Mn-mod, 1050, 1054Mn-mod, 1060, 1062, 1080, 1095, 1095 C-mod, 1321, 1335, 1340) digitizedfrom the U.S. Steel Atlas of Isothermal Transformation Diagrams, 1951edition (confirmed public domain, U.S. Copyright Office renewal search).