Generating brushed metal is very easy and requires only three steps:
Step 1: Creating a new texture
Open the New Texture Dialog by pressing thebutton (upper left corner) or selecting the File->New menu item.
Change the Width and Height values to 256x256 pixels.
Set the Background Color to a light gray likeRGB(192,192,192).
Press the OK button.
Step 2: Adding scratches
Select the function Noise/Scratch.
Press the Reset button at the Presets Panel to load the function's default settings.
Set the Direction Angle to 0° with Full Radius by clicking on the right arrow button.
Click with the left mouse button on the texture to add the scratches.
Step 3: Smoothing the scratches
Select the function Filter/Motion Blur.
Load the function's Default Preset. The Direction Angle should now reside at 0°.
Click on the texture to smooth along the scratches. That's it.