The database contains 2,185 non-metallic inclusions in steel (with the 5,661 figures) collected from the journals, books, and web sites from the year 1931 (Carl Benedicks and Helge Lofquist) to the year 2018. All information herein is a extracted from open literature, and is a orginally written by the authors, from the source references cited. Database is searchable with the usual keyword search - by steel name, or any other words. We hope that this database makes your professional life more productive and easily.