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Steel Making

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

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

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

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

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

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

SULPHUR is another element (symbol S) which is always found i...

Silicon prevents, to a large extent, defects such as gas bubb...

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

Alloying Elements
Commercial steels of even the simplest types are therefore p...

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

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

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

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

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

Restoring Overheated Steel


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peg was withdrawn and quenched at each of the temperatures indicated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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