12-22-2017, 03:45 PM
Mr. Mark, thanks for your explanation, appreciated. The temperature 470°F was chosen only as a suitable number for my heat transfer example.
Mr. Me2, you are correct, steel composition affects the heat temper colour. In stainless steel, the chromium content is the most important factor influencing oxidation. The higher chromium content, the more heat resistant the steel. This results in delayed development of temper colour.
Other factor affecting heat temper colour is time. Standardised colour charts assume heating for approx. 1 hour. When the steel is heated for longer time than the heat temper colour falsely indicates that the steel was exposed to higher temperature.
Jan
Mr. Me2, you are correct, steel composition affects the heat temper colour. In stainless steel, the chromium content is the most important factor influencing oxidation. The higher chromium content, the more heat resistant the steel. This results in delayed development of temper colour.
Other factor affecting heat temper colour is time. Standardised colour charts assume heating for approx. 1 hour. When the steel is heated for longer time than the heat temper colour falsely indicates that the steel was exposed to higher temperature.
Jan