You don't need to use Mental Ray to make a chrome shader.

Easiest way is to create a blinn, make it black, play with the specular roll off, color, and eccentricity until you get a tight, bright highlight. Make sure you have an environment, sphere, or something to reflect in the chrome. In your render globals, make sure that you have raytracing on, and the reflections upped to around 3 or so. Depending on how many reflective surfaces you have. Settings the render settings to production quality will automatically set them to 10. Then all you need to do is play around with the reflectivity attribute in the material.

You can also try downloading some from here: https://www.creativecrash.com/maya/do...&type=&x=0&y=0

Take it easy.