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Steel_Part_3 - Steels Part 3 Designation Scheme AISI-SAE...

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Steels Part 3
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Designation Scheme: AISI—SAE number system Generally a 4-digit number Read as 2 two-digit pairs 1080 ten eighty 4140 forty-one forty 8620 eighty-six twenty
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The first two digits represent chemical family 10 = plain carbon (no intentional alloy additions) Other = alloyed steel Last two digits designate the “points” of carbon (i.e. carbon content) One point = 0.01% 1080 = plain carbon steel with 0.80% carbon 4140 = alloy steel with 0.40% carbon
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Heat Treatment: Any elevated temperature process whose intended purpose is to alter the structure and properties of a material Typically associated with establishment of final properties
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A family of treatments exists to facilitate ease of manufacture Weaken (less force required for shaping) Enhance ductility Enhance machinability Equilibrium conditions produce the weakest, most ductile structures Slow cools Long times at elevated temperatures Guiding Tool: equilibrium phase diagram
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