Blue Tempered
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 thinner and stronger than metal. Does not affect the hardness, but increased yield and reduced the fragility of the steel. In this cooling is carried out immediately after drying, can be considered 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 dipped into water to 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 Some water, remove the work of the tub and quickly rub the finish with fine sandpaper.
Since the heat of non-cooled warming gradually developed, however, the color of the polished quickly. When you reach a certain color, the tool must be completely submerged in water until cool.
In turn, a planer, shaper and cutters, this color should be yellow straw.
Reamers and taps should be cooled in a straw-colored hands.
Drills and drilling tools and the wood should be brown.
Blue or violet light is good for chisels and screwdrivers.
The dark blue should be achieved for the springs and wood saws.
The darker colors than that, ranging through green and gray note that the work came to an ordinary character, ie it is partially annealed.
After properly tightened spring dip in butter or fish oil, to be held in a fire while still wet with oil. The oil is fire and burns, spring tempered.
Remember that self-hardening steels should not be submerged in water, and always remember all the jobs that require degrees heat, more carbon, less heat.
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This article was an exerpt from “The Welding
Bible”. The Welding Bible is your complete source of methods, charts and information about gas and arc welding, brazing, cutting and properties of metals.
Article Source: ArticlesBase.com – Tempering Metals
