Study On A Reduction-bonding Process For Manufacturing Stainless Steel Clad Strip

In this study,the stainless were successfully bonded by hot rolling in high purity hydrogen ,which were with 304 stainless steel and 235 carbon steel for raw materia. The technology production cost is low,can continuously manufacture and improve the efficiency.This test composited hot-rolled strip with stainless clad which was under the premise of hot-rolled strip surface oxidized scale reduced in high purity hydrogen.The text analied the influence of each reduction parameters to carbon-steel surface oxidation conversion, iron sheet surface and the cross section shape and the influence of each rolling parameters to the composite microstructure and bonding strength of the clad .Through the research of morphology change rule of strip surface oxidized scale and the test of bonding strength of the clad ,the results indicated: the transformation rate of oxidized scale was gradually increasing with the rise of temperature, gas flow and reduction time.The unit area weight loss of iron oxideis was 4.53g/m² at the temperature of 700℃, the gas flow of 30L/h and the reduction time of 1 min, the surface remained lots of oxidized scale.The unit area weight loss of iron oxideis was 7.2g/m² at the temperature of 900℃, the gas flow of 100L/h and the reduction time of 7min, the surface was clean.The shearing strengths and peel strength of clad strip vary directly as deformation rate and bonding temperature.The minimum shearing strength and peel strength can reach 224MPa and 212 N·mm^-1 respectively at 950℃by the first pass with deformation rate of 18.5%. The maximum shearing strength is up to 376MPa at 1050℃by the sixth pass with accumulated deformation rate of 70%. The maximum peel strength is greater than the strength of carbon steel substrate.Through the reduction-bonding test achieved the best preparation for composite technology:reduction temperature was 1000℃, reduction time was 6min, the gas flow was 70L/h, rolling temperature was 1050℃, the first pass deformation rate was 21.6%, the second pass accumulated deformation rate was 40%, the third pass accumulated deformation rate was 51.5%, the fourth pass accumulated deformation rate was61.4%, the fifth pass accumulated deformation rate was 68.7% , the sixth pass accumulated deformation rate was 74.8%...