1957 D Jefferson Nickel Line Above The Mint Mark? - Page 3

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Pete2226 Pillar of the Community United States 3331 Posts	Posted 08/19/2015 1:09 pm Quote: the nickel planchet is much thicker and harder material than copper cents The nickel planchet is certainly thicker, but not necessarily harder! The Rockwell 15T Hardness for Cupronickel is a range of 60-69, and for Copper-plated Zinc the range is 62-72. The cent planchet is *slightly* harder! I have not found this same information for pre 1982 cents, so they could be softer! Perhaps there is something wrong about the way I am looking at this information, so I am willing to be corrected! Edited by Pete2226 08/19/2015 1:11 pm Report this Post to the Staff
coop Bedrock of the Community United States 62064 Posts	Posted 08/19/2015 1:18 pm The nickel in the planchet makes the planchets harder. (75% copper + 25% nickel) The die wear on nickels are a lot harder on the steel dies, thus causing the wear to show more on these dies. The more die wear the PIDT can show on the dies. Probably there all the time we have been looking. We are just now understanding what it is. Report this Post to the Staff
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