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

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

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

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

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

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

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

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

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

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

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

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

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

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

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

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

Lathe And Planer Tools
FORGING.--Gently warm the steel to remove any chill, is parti...



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.





Next: Hardening Carbon Steel For Tools

Previous: S A E Heat Treatments



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