Algorithm model 1 Alloying elements 1 Case-studies 1 Current data 1 Data-driven algorithm Empirical model 1 Forecasting 1 Gaussian methods 1 Gear steels 1 Hardenability 1 Large dataset 1 Machine learning 1 Small data set 1 XGboost 1 Xgboost 1 gear steel 1 hardenability 1 machine learning 1 small dataset 1