Abstract: The Φ22 mm x 2 mm 304 stainless steel tube-0. 1 mm copper foil-Φ17. 2 mm Q195 reinforce steel bar is cold-drawn by reduction 10% in diameter to make the 3 layer metal closed contact, than heated and brazed at 1 150 ℃ to get Stainless steel/carbon steel clad bar. The effect of heating temperature 1 100 〜1 225 ℃ for i h and holding time (0. 5 〜4 h) at 1 150 ℃ on structure and performance of contacted interface of clad reinforce bar has been studied. Results show that the strength of brazing metal interface heated at 1 150 ℃ is maximum , i. e. 296 MPa, and the copper foil as a brazing layer is available to fulfill the metallurgical combination of stainless steel layer and carbon steel layer； with increasing holding time at 1 150 ℃，the diffusion distance and concentration of elements between stainless steel and carbon steel increase, with holding for 2 h the Fe in carbon steel side diffuses into copper foil about 80μm and the Cr and Ni in stainless steel side diffuse into carbon steel about 60μm； and the bubble type iron base solid solution containing Cr and Ni occurred in copper brazing layer becomes larger and increases ； and with increasing holding time the shear strength and micro hardness of interface area are increase first and then decrease, and with holding for 2 h the shear strength and micro hardness are up to maximum and respectively 301 MPa and HV423.

Key words: 304 Stainless Steel-Q195 Carbon Steel Cladding Reinforce Bar, Cold Drawing, Copper Brazing, Holding Time at 1 150 °C, Shearing-Strength

摘要： Φ22 mm×2 mm 304不锈钢管-0.1 mm铜箔-Φ17.2 mm Q195钢筋经10%减径冷拔使3层金属紧密结合,再经1150℃加热钎焊得到不锈钢/碳钢复合钢筋。研究了1 100~1 225℃保温1 h和1150℃的保温时间（0.54 h）对复合钢筋结合界面组织性能的影响。结果表明,1150℃加热后钎焊金属界面强度最大为296 MPa,铜箔作为钎焊层可以有效的实现不锈钢层和碳钢层的冶金结合;随1 150℃保温时间增加,不锈钢和碳钢之间的元素扩散距离和浓度增加,保温2 h,碳钢侧的Fe扩散到铜层约80μm,不锈钢侧的Cr和Ni扩散到碳钢内部约60μm,铜钎焊层出现含Cr、Ni的气泡状铁基固溶体并变大变多;界面区域的剪切强度和显微硬度随保温时间呈先增大后减小的趋势,保温2 h后达到最大值,分别为301 MPa和HV423。

关键词: 304不锈钢-Q195碳钢复合钢筋, 冷拔, 铜钎焊, 1150℃保温时间, 剪切强度