SteelBench v1.0: A Benchmark Dataset for Steel Mechanical Property Prediction with Grade-Shift Evaluation

SteelBench is an open benchmark for steel mechanical property prediction that links heat-level chemistry, heat-treatment parameters, and tensile properties with grade identity and data-origin labels. The dataset contains 1,636 samples across 594 steel grades and 17 steel families, aggregated from public and semi-public sources: MMPDS, NIMS, EMK, Kaggle, and laboratory measurements. Two variants are included: steelbench_core.csv — strict publication variant (original reported values only) steelbench_full.csv — filled training variant (missing heat-treatment parameters imputed using documented assumptions) Key features: 11 input features: C, Mn, Si, Cr, Ni, Mo, V, Cu, Al, austenitize_T, temper_T Targets: tensile_strength, yield_strength, elongation Grade-shift evaluation protocols: RandomKFold, GKF-grade, LOFO (Leave-One-Family-Out), LOSO (Leave-One Source-Out) Data-origin (provenance) labels for each filled field Associated paper: "SteelBench: A Physics-Aware Benchmark for Steel Mechanical Property Prediction" (under review at KDD 2026). Reference code: https://github.com/cornada/steelbench