Comprehend that the chemical composition of plain-carbon steels contributes to their physical and mechanical properties and therefore to usability in industrial/mechanical applications for - low-carbon steel 0.07% to 0.30% carbon: automobile body parts, wire products, structural plates and sections, seamless tubes and boiler plate - medium-carbon steel 0.30% to 0.60% carbon: automotive components, including shafts, axles, gears and crankshafts, stampings and forgings, train rails, wheels and axles - high-carbon steel 0.60% to 2.0% carbon: high-strength spring materials and wires, cutting tools, punches, dies and industrial knives.

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Calculate the percentages solid and liquid, along with composition solid and liquid, using the lever rule for binary alloys with complete solid insolubility and partial solid solubility.

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Comprehend the mechanical properties of and current uses for engineering plastics, including - acrylonitrile butadiene styrene (ABS) high heat resistance, good low-temperature resistance, high impact resistance, high chemical resistance, excellent electrical insulation, good dimensional stability automobile parts, personal protective equipment (e.g. face shields, hard hats, helmets), electrical equipment (e.g. power tools housings, printers, vacuum cleaners) and high- strength applications in the construction industry - polycarbonate (PC) high transparency, good toughness, high impact strength, good chemical resistance, high heat resistance, good electrical properties, high dimensional stability lenses and shields (e.g. automotive headlamps, security windows, motorcycle face shields and windscreens, prescription lenses, safety glasses, machinery guards, skylights, and streetlamps) and electrical and electronic device housings - polyamide (PA6/nylon 6) high strength, high abrasion resistance, good thermal resistance, good chemical resistance, good electrical properties, good fatigue resistance machine parts (e.g. gears, rollers, guides, bearings, wear pads and wheels), medical implants, electrical connectors and fishing line.