advanced rendering for AutoCAD
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find a good metal material picture and make a textured material with it. Maybe you find what you're looking for here . If you are familiar with PS, use the offset filter to make a more seamless texture.
Are you wanting to do the galvanized pipe? or the overhead beam? The simplest for each would be to start with a texture map. There are some good textures at at http://accustudio.com/exchange/textures/category/20-metals. You probably could do the metal pipe using one of the procedural methods. We are also adding a bunch of materials to AccuStudio, I will check to see what is in the queue.
Try this.