No wonder, since the "Chrome" material in the "Color" section is, in fact, what you'd get if you were airbrushing "chrome" in a painting, not the polished metallic mirroring we understand as a chrome finish. Somebody at Lytewyrx has a sense of humor.
For metal effects that interact with the raytracing aspect of rendering, you'll need the presets found in the "Metals.lwa" file available from:
http://www.lightworks-user.com/
Put this lwa file in your ... I'm not sure the official place --- but I made a folder in my library called "LightWorks Materials" and it finds them all there.
When you want to make the new material, click the "Load From Archive"
button in the material dialog to access the metals.lwa list.
Or just make the tubing a total mirror and see if that is close enough.
Dwight Atkinson