Material Selection is part of the 3-legged stool along with mechanical testing and material processing. Steel represents approximately 90% of what metallic components are made from. Aluminum represents about 5% and copper plus all others make up the remainder. Some steels are strong and brittle, while others are weak and ductile, some have great corrosion resistance, some are not expensive, some are bio-compatible, and so on. Understanding the operating environment and expected performance enables the proper selection. Different elements like Chrome-moly, A36, Ti-6-4 all have their benefits for a given application.
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