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Hardening
The forgings can be hardened by cooling in still air or quen...

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

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

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

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

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

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

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

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

Connecting Rods
The material used for all connecting rods on the Liberty engi...

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

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

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

Crucible Steel
Crucible steel is still made by melting material in a clay or...

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

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

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



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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