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Steel Making

Compensating Leads
By the use of compensating leads, formed of the same materia...

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

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

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

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

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

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

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

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

Annealing Work
With the exception of several of the higher types of alloy s...

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

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

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

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

Furnace Data
In order to give definite information concerning furnaces, fu...

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

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peg was withdrawn and quenched at each of the temperatures indicated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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