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Steel Making

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

High Speed Steel
For centuries the secret art of making tool steel was handed ...

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

Annealing Method
Forgings which are too hard to machine are put in pots with ...

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

Molybdenum
Molybdenum steels have been made commercially for twenty-five...

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...



Restoring Overheated Steel






Category: HARDENING CARBON STEEL FOR TOOLS

The effect of heat treatment on overheated steel is shown graphically
in Fig. 65 to the series of illustrations on pages 137 to 144. This
was prepared by Thos. Firth & Sons, Ltd., Sheffield, England.



The center piece Fig. 65 represents a block of steel weighing about
25 lb. The central hole accommodated a thermo-couple which was attached
to an autographic recorder. The curve is a copy of the temperature
record during heating and cooling. Into the holes in the side of
the block small pegs of overheated mild steel were inserted. One
peg was withdrawn and quenched at each of the temperatures indicated
by the numbered arrows, and after suitable preparation these pegs
were photographed in order to show the changes in structure taking
place during heating and cooling operations. The illustrations here
reproduced are selected from those photographs with the object
of presenting pictorially the changes involved in the refining of
overheated steel or steel castings.





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Previous: S A E Heat Treatments



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