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Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

Hardening
Steel is hardened by quenching from above the upper critical....

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

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

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

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

Quenching
It is considered good practice to quench alloy steels from th...

The Thermo-couple
With the application of the thermo-couple, the measurement of...

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

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

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

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

Conclusions
Martien was probably never a serious contender for the honor ...

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

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

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

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



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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