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Old March 26, 2012, 09:15 AM   #13
dahermit
Senior Member
 
Join Date: October 28, 2006
Location: South Central Michigan...near Ohio, Indiana.
Posts: 4,442
"...The thin layer of heat treat is for wear resistance and corrosion resistance ..." "heat treat", does not always mean case hardening. Sometimes, (frequently, more often), it means through hardening (and drawing).
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