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.