Microstructure And Mechanical Property Of Clad Plate Of Stainless Steel By Vacuum Composite Rolling

Stainless steel is widely used, for its good properties and corrosion resistance. However, since stainless steel contains a high percentage of precious metals, such as nickel and chromium, and China faces a situation of big demand for stainless steel imports and low self-sufficiency rate, therefore, the application of stainless steel/carbon steel clad plate has great practical significance. In this paper, the heating temperature, rolling reduction ratio, vacuum, pickling before welding, the addition of interlayer and annealing after rolling six types of experiments to study the factors that can affect the microstructure and mechanical properties of stainless steel/carbon steel clad plate, and the high qualified stainless steel/carbon steel clad plate have been successfully produced in the laboratory.This paper introduces the production and development situation of the stainless steel/carbon steel clad plates, and studies the clad mechanism, microstructure and mechanical properties of the clad plate using various experimental methods. The following conclusions are reached:1. The austenite stainless steel/carbon steel clad plates are vacuum clad rolled in laboratory situations.2. In this paper, the heating temperature and rolling reduction ratio experiments are used to study the factors that rolling technology on the microstructure and mechanical properties of stainless steel/carbon clad plate. The microstructure is characterized by optical microscopy, scanning electron microscopy. The mechanical properties test is carried out using shear experiments. Results indicate that with the heating temperature increasing, the composite layer width becomes larger, the interface shear strength will be increased. Large reduction ratio can break interface-oxide, make new metal achieve stronger metallurgical bonding, increase the mechanical properties of composite interface.3. In this paper, vacuum and pickling before welding experiments are used to study the factors that surface treatment on the microstructure and mechanical properties of stainless steel/carbon clad plate. The microstructure is characterized by optical microscopy, scanning electron microscopy. The mechanical properties test is carried out using shear experiments. Results indicate that with the vacuum increasing, the composite interface shear strength increased. Pickling can reduce the residual oxide layer of carbon steel and stainless steel, improve the mechanical properties of stainless steel/carbon steel composite interface.4. In this paper, the addition of interlayer and annealing after rolling experiments are used to study the factors that interlayer and annealing on the microstructure and mechanical properties of stainless steel/carbon clad plate. The microstructure is characterized by optical microscopy, scanning electron microscopy. The mechanical properties test is carried out using shear experiments. Results indicate that the mechanical properties of adding nickel foil is better than adding niobium foil, because nickel foil has the better compatibility. Annealing can effectively promote the spread between the metals and improve the composite interface shear strength.5. According to the experiment content, pickling,1×10-2Pa high vacuum welding, heated to 1200 after 90min, total pressure 80%, pass reduction rate 35%, 30%,30%,30% is proposed as the optimizing process.