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Steel Making

Corrosion
This steel like any other steel when distorted by cold worki...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

Annealing
There is no mystery or secret about the proper annealing of d...

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

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

Drop Forging Dies
The kind of steel used in the die of course influences the he...

Silicon
SILICON is a very widespread element (symbol Si), being an es...

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

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

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

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

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

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

Connecting Rods
The material used for all connecting rods on the Liberty engi...

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

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...



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peg was withdrawn and quenched at each of the temperatures indicated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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