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Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

The Electric Process
The fourth method of manufacturing steel is by the electric f...

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

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

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

Machineability
Reheating for machine ability was done at 100 deg. less than ...

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

Critical Points
One of the most important means of investigating the properti...

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

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Gears
The material used for all gears on the Liberty engine was sel...

The Modern Hardening Room
A hardening room of today means a very different place from ...

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...



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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