To create a Smooth metal effect in Phototoshop, follow this tutorial....
1.) First, create a new image about 600x600 pixels (or whatever size is appropriate for the image you plan to create). If you haven't already got a shape that you want to apply this effect to, now's the time to make something. The shape in the example is simply made up of 2 circles blended together. Once you have your shape, fill it with this shade of gray: #E6E6E6. Keep your shape on its own layer and make sure you have nothing selected (press CTRL+D).
With your shape's layer selected, go to Layer » Layer Styles » Inner Glow, and match up your settings with these: Inner Glow
This gives our shape its first hint of a bevel.
3.) Next click on Gradient Overlay and dial in the following settings: Gradient Overlay
To add a final touch to the smooth metal, click on Satin and match these settings: Satin Settings
Your smooth metal style is complete at this point, though you may wish to add in an optional drop shadow.
But wait... do NOT click OK yet. Remember, we want to add this layer style to your arsenal so you can call upon it when ever you need it.
Click at the top where it says Styles
Now click the "New Style" button and give your style a name such as "Smooth Metal", then click OK. You should then save your styles by clicking the arrow icon to the left and choosing "Save Styles" from the list.