In this research, the structure of weld zone of 316L steel during friction welding process and its corrosion behavior is studied. For this purpose, the process parameter such as time and pressure were considered as variable parameters in welding and their effects on microstructure, mechanical and corrosion behavior were studied. First, samples were welded and then, they were characterized by metallographic test, X-ray diffraction, scanning electron microscopy, energy dispersive spectrometry and ferritoscopic test. Also, to study the mechanical properties of samples tensile strength test and microhardness test were done. Corrosion behavior of samples was studied by dynamic polarization potential. All the test were done in 3.5% sodium chloride solution. Microstructure studies showed that obtained welded samples have complete joint and all the samples have finer microstructure in weld zone than base metal. Also, by increasing the pressure from 40 to 60 MP and friction time from 4 to 8 seconds, grains size in weld zone increased from average size of 1.5 to 2.9 micrometer, in addition to increasing the amount of ferrite in structure. Results of microhardness test also showed the hardness of weld zone than base metal increased of 255 to 275 HV. Moreover, results of tension test showed that tension properties of weld samples are close to the base metal. Furthermore, results of corrosion test indicated that corrosion properties are weakened due to the finer grain and increasing ferrite fraction in welded samples than base metal. Keywords : 316L Austenite Stainless Steel, Friction Felding, Mechanical Properties, Microstructure, Corrosion Properties, Friction Time and Pressure.