In this study, the impact of different surface treatment and degree of vacuum on the interface and mechanical properties of 304/Q345 stainless steel clad plate was investigated. The study indicated that more continuous or aggregated Al₂O₃ and Si-Mn composite oxides were formed at the interface after brush grinding. However, less inclusions such as Al₂O₃, MnS and Ca-Mg-Al-Si composite oxides were formed at the interface after pickling treatment. For the vacuum degrees of 10-2 Pa, 1 Pa and 105 Pa, the oxidation reaction became more intense with the decrease in vacuum degree. The interface inclusions were gradually changed from Al₂O₃ and Si-Mn complex oxides to oxide scale and MnCr₂O₄ spinel oxide. The interfacial bonding strength of stainless steel clad plate was improved with the increase in degree of vacuum. The bonding strength was 55 MPa at vacuum of 10⁵ Pa, but it was 484 MPa at vacuum of 10-2 Pa, which is far greater than that of the national standard, and an excellent performance was obtained.
Keywords: clad plate; degree of vacuum; interface inclusions; surface treatment; vacuum hot rolling.