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 onehistorical 1930 source, with datum-level provenance: every value carriesits exact source location, extraction method, extraction date, and theoriginal publication's license 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. Eleven datasets across seven source publications are included, coveringgrades S960MC, 42C, 42D, 23MnNiCrMo5-3, 54SiCr6, HRB500DW, a leanmedium-Mn Q&P steel, and the historical eutectoid "Steel B" fromDavenport & Bain (1930).