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

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

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

Care In Annealing
Not only will benefits in machining be found by careful anne...

ANNEALING can be done by heating to temperatures ranging from...

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

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

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

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

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

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

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

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

Double Annealing
Water annealing consists in heating the piece, allowing it to...

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

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

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

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

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peg was withdrawn and quenched at each of the temperatures indicated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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