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Steel Making

The Influence Of Size
The size of the piece influences the physical properties obta...

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

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

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

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

The Modern Hardening Room
A hardening room of today means a very different place from ...

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

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

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

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

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

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

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

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

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

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

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

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



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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