AWS is a serious industry standard information source. According to them the chrome in stainless steel is the source of the color change. Getting rid of it will not stop it from coming back. Chrome (a major component of most Stainless Steel) is always oxidized on its surface. It is a reactive metal. Here is there take on the issue: This oxide layer [color on stainless steel] is not formed just by heating. In fact, such a layer is always present, and simply results from chemical interaction of chromium on the very surface of the steel with the oxygen in the air. If you were to scratch the surface or rub it with sandpaper you would "erase" this layer, but a new oxide film would form essentially instantaneously. This oxide layer is one of the things that makes stainless work. It forms a protective film that separates the steel from the corrosive effect of air, moisture, and other things on the outside. Of course, this layer can be penetrate or temporarily rubbed off, but it always comes back and always is the first line of defense.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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