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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.
Galvanneal steel includes the process of galvanizing with an added step â after the zinc coating, the steel is heated to around 1050Â° Fahrenheit. This process of extreme heating draws more of the iron out of the steel and causes it to mix with the zinc. The finished product has an alloy coating of approximately 90% zinc and 10% iron. In the realm of steel doors and frames there are three types of galvanized and galvanneal steel used â A40, A60, and G90. The differences in the three are based on the percentage of galvanneal coating per square foot and the protection they offer.