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McNICHOLSÂ® Quality Expanded Products McNICHOLSÂ® Expanded Metal is a versatile and economical product. Made from a sheet of metal uniformly slit and stretched, forming diamond-shaped openings in the sheet â Expanded is a one piece construction that wonât unravel and under normal circumstances and will hold its shape for many years.
Â­Steel is iron that has most of the impurities removed. Steel also has a consistent concentration of carbon throughout (0.5 to 1.5 percent). Impurities like silica, phosphorous and sulfur weaken steel tremendously, so they must be eliminated. The advantage of steel over iron is greatly improved strength. The open-hearth furnace is one way to create steel from pig iron. The pig iron, limestone and iron ore go into an open-hearth furnace. It is heated to about 1,600 degrees F (871 degrees C). The limestone and ore form a slag that floats on the surface.