In the scene there is a model of a cut-in hood made of polished MIELE DA 2558 stainless steel 532 mm, hood width 532 mm, depth 372 mm. The model consists of several elements, everything is assembled into one object and multi-material is assigned. All materials were renamed and simplified as much as possible, I converted the Corona Render materials and did NOT check them in the scene for rendering, check the model in a separate scene. Large weight of the model due to the geometry of the grease mesh. There is a plane under the mesh with simulated mesh maps, so you can always lighten the model by removing excess geometry.

There are no materials in the OBJ and the file, just geometry.

Who works in 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.