The paper is behind a pay wall, but their figures and extended data stuff is free to view here: https://www.nature.com/articles/nature25476#extended-data https:

The paper is behind a pay wall, but their figures and extended data stuff is free to view here: https://www.nature.com/articles/nature25476#extended-data https://www.nature.com/articles/nature25476#extended-data They say that their ultimate tensile strength of their material is ~600 MPa. Steel ranges from 250-2500 MPa.