Temperature For Annealing





Theoretically, annealing should be

accomplished at a temperature at just slightly above the critical

point. However, in practice the temperature is raised to a higher

point in order to allow for the solution of the carbon and iron to

be produced more rapidly, as the time required to produce complete

solution is reduced as the temperature increases past the critical

point.



For annealing the simpler types of low-carbon steels the following

temperatures have been found to produce uniform machining conditions

on account of producing uniform fine-grain pearlite structure:



0.15 to 0.25 per cent carbon, straight carbon steel.--Heat to 1,650 deg.F.

Hold at this temperature until the work is uniformly heated; pull

from the furnace and cool in air.



0.15 to 0.25 per cent carbon, 1-1/2 per cent nickel, 1/2 per cent

chromium steel.--Heat to 1,600 deg.F. Hold at this temperature until

the work is uniformly heated; pull from the furnace and cool in air.



0.15 to 0.25 per cent carbon, 3-1/2 per cent nickel steel.--Heat

to 1,575 deg.F. Hold at this temperature until the work is uniformly

heated; pull from the furnace and cool in air.





Take Time For Hardening Temperature Recording And Regulation facebooktwittergoogle_plusredditpinterestlinkedinmail

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