不锈钢-碳钢复合带肋钢筋的制备工艺研究

摘要：使用金属熔覆和热轧的方法成功制备了覆层为Cr13不锈钢的复合钢筋。通过有限元数值模拟发现，在粗轧区域的高温变形过程，塑性应变主要集中在轧件表层和1/4位置，芯部的变形较表层偏小，随着变形的不断进行，塑性应变不断向碳钢芯部渗透。复合钢筋在成品机架K1变形时，不锈钢全部包裹在碳钢上，但是在横断面的不锈钢覆层厚度分布不均匀，在复合钢筋横肋根部的不锈钢覆层厚度最薄，在横肋顶部的不锈钢覆层厚度最厚。复合钢筋的开轧温度为1130℃，精轧温度为1000℃。复合钢筋成品的界面结合良好，达到了冶金结合状态，在界面处Cr的扩散层厚度达到了32μm。复合钢筋成品的各项力学性能均达到了国标要求。

Research on manufacturing process of stainless steel/carbon steel composite rebar

The composite steel bar with the cladding metal of Cr13 was prepared by metal deposition and hot rolling method. Finite element method was applied to simulate the rolling process of stainless steel/carbon steel composite rebar. During the high temperature deformation process in the rough rolling passes, the plastic strain mainly concentrates on the surface layer and 1/4 position of the rolled part, and deformation of the core is smaller than that of the surface layer. With the continuous deformation, the plastic strain continuously penetrates into the carbon steel core. When the composite steel bar is deformed in the finishing mill of K1, the stainless steel is all wrapped on the carbon steel, but the thickness distribution of the cross sectional stainless steel cladding is uneven. When in hot rolling, a starting rolling temperature of 1130℃ and a finishing rolling temperature of 1000℃ were applied. The interface of the composite bar is well combined, reaching the metallurgical bonding state, and the thickness of Cr diffusion layer is up to 32μm. The mechanical properties of the composite steel bar meet the requirements of the national standard.