If a razor is stropped too fast- can the friction-generated heat alter temper of the cutting edge? When I first went to Barber Shops, barbers were still using real straight razors. They were always in a hurry while stropping. After only a few whick-whacks on the strops, the blades were non-pulling sharp for shaving around the ears and on the neck . I did see some men buy face shaves also. More stropping happened then. Barbers' hands are fast. Production is business. I read somewhere that the tip of a phonograph needle gets very very hot while tracking in record grooves. That is why good needle tips are diamonds?...I am unsure that barbers never ruined their razors by overly fast stropping, but we strop for longer times for HHT and possibly OCD as well. Maybe some blade metals are affected by too much heat at that microscopic area where cutting edge meets leather/linen. Detail work for an IR Scanner perhaps...