采用非真空轧制非对称组坯方式在不同总压下率（28%～70%）下制备Q235碳钢/304不锈钢复合板，研究了复合板界面处的组织、夹杂物形貌、硬度和剪切强度，探讨了界面夹杂物与脱碳层对界面结合强度的竞争性影响。结果表明：随着轧制总压下率的增加，复合板界面夹杂物由集中分布的块状变为均匀分布的颗粒状；当轧制总压下率由28%增大到47%时，影响复合板界面结合强度的主要因素是界面夹杂物，增加轧制压下率有利于提高界面结合强度；当轧制总压下率由47%增大到70%时，不锈钢侧晶粒尺寸急剧减小，碳钢侧脱碳层厚度增加，界面结合强度降低，脱碳层成为影响结合强度的主导因素。可以通过合理控制轧制压下率来平衡界面夹杂物和脱碳层对结合强度的竞争性影响。

Q235 carbon steel/304 stainless steel clad plate was fabricated by non-vacuum rolling asymmetric billet with different total reductions (28%-70%).The microstructure, inclusion morphology, hardness and shear strength at interfaces of the clad plate were studied, and the competitive effects of inclusion and decarburization layer on the interface bonding strength were discussed.The results show that with increasing total rolling reduction, the inclusions at the interface of the clad plate changed from concentrated lump to uniform granular.When the total rolling reduction increased from 28% to 47%, the interface inclusion was the main factor affecting the bonding strength; increasing the rolling reduction was beneficial to improve the interface bonding strength.When the rolling reduction increased from 47% to 70%, the grain size on stainless steel sides decreased sharply, the thickness of decarburization layer at carbon steel side increased, and the interface bonding strength decreased; the decarburization layer become the dominant factor affecting the bonding strength.The competitive effects of interface inclusions and decarburization layers on bonding strength could be balanced by controlling the rolling reduction reasonably.