Temper Steel

Hardened metal

Author: Jeff Bowerman

Tempering is the process of making steel disk after it has hardened, so it will perform a cutting edge and resist cracking. Tempering makes the grain finer and stronger than metal. Does not affect the hardness, but increases performance and reduces the brittleness of steel. In this cooling takes place immediately after drying, could be considered as a continuation of the process of age.
The work or tool to be tempered is slowly heated to cherry red and the cutting end is then soaked in water at a depth of 1 / 2.3 / 4 inch above the point (Figure 6). From the point of being fresh, always leaving the red tool on the piece in water, remove the work of the tub and quickly rub the finish with fine sandpaper.
Since the heat of the non-refrigerated gradually heated to the point again, the color of the polished quickly. When you reach a certain color, the tool must be completely submerged in water until cool.
In turn, planer, shaper and cutters, this should be straw yellow color.
Reamers and taps should be cooled in a straw-colored hands.
Drills, chisels and tools of wood should have a brown color.
The light blue or purple is good for chisels and screwdrivers.
The dark blue, must be achieved by the springs and wood saws.
Darker colors that, ranging through green and gray note that the work came to an ordinary character, ie it is partially annealed.
After hardening of successfully demonstrated by dipping them in butter or fish oil, to be held in a fire while still wet with oil. The oil catches fire and burns, Spring tempered.
Remember that self-hardening steels should not be submerged in water, and always remember all jobs that require degrees of heat, more carbon, less heat.

About the author:

This article is excerpted from "The Welding
. Bible 'Bible welding is complete source of their methods, pictures and information on gas and arc welding, welding, cutting and properties of metals.

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