The model consists of several objects the objects are assembled into a group the group name has the prefix [G]. The seat has a TurboSmooth modifier (0/1). Objects have a common multimaterial. All materials were renamed and simplified as much as possible I converted the materials of Corona Render and did not check in the scene for rendering. There are no materials in the OBJ file only geometry. Who works in the V-Ray version lower than 3.1 be careful in the materials in the BRDF section there is Microfaset GTR (GGX) if your version is older than 3.1 then the BRDF field will be empty. Choose Blinn Phong or Ward – which is preferable for you.