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Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...

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...

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

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

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

Double Annealing
Water annealing consists in heating the piece, allowing it to...

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

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

Pyrometers
Armor plate makers sometimes use the copper ball or Siemens' ...

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

Hardness Testing
The word hardness is used to express various properties of me...

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

The Forging Of Steel
So much depends upon the forging of steel that this operation...

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

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

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

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



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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