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Steel Making

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

Bessemer Process
The bessemer process consists of charging molten pig iron int...

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

Piston Pin
The piston pin on an aviation engine must possess maximum res...

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

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

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

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

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

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

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

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

Care In Annealing
Not only will benefits in machining be found by careful anne...

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...



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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