**4. Conclusions**

In this paper, a hot-rolled NM500/Q345 clad plate was used as the material, and austenitization heat treatment at different temperatures was used. The microstructure of the NM500/Q345 clad plate was studied using OM, EBSD, and TEM, and its mechanical properties were analyzed using a Shimadzu tensile machine and by examining its hardness and wear resistance. The following conclusions were drawn:


imized the friction coefficient. After austenitization + tempering, the hardness of the wear-resistant steel increased, the wear resistance also increased, and the friction coefficient increased with it. After quenching at 860 ◦C and tempering at 200 ◦C, the friction coefficient was the largest. When the austenitization temperatures were 900 ◦C and 940 ◦C, the friction coefficient was not much different. The wear was the worst when the material was not quenched. After austenitization at 900 ◦C + tempering at 200 ◦C, the wear of NM500 was the lightest; the maximum depth of the wear scar was 14 μm; the width was the narrowest, 0.73 mm; and the wear volume was the smallest, 0.0305 mm3.

**Author Contributions:** Conceptualization, G.Z. and J.L.; methodology, G.Z. and R.Z.; formal analysis, G.Z.; investigation, R.Z., H.L. and C.L.; resources, G.Z.; data curation, R.Z., Y.L. and C.L.; writing— original draft preparation, R.Z.; writing—review and editing, G.Z., R.Z. and J.L.; visualization, J.L.; supervision, G.Z. and H.L.; funding acquisition, G.Z., J.L., H.L. and Y.L. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by the National Key Research and Development Program of China (2018YFA0707305), the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi (2021L292), the Fundamental Research Program of Shanxi Province (20210302124009 and 20210302123207), the Taiyuan University of Science and Technology Scientific Research Initial funding (20212026), and the Shanxi Outstanding Doctorate Award Funding Fund (20222042).

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Not applicable.

**Acknowledgments:** The authors would like to thank the Provincial Special Fund for Coordinative Innovation Center of Taiyuan Heavy Machinery Equipment for providing the facilities for the experimental works.

**Conflicts of Interest:** The authors declare no conflict of interest.
