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Steel Making

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

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

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

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

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

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

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

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

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

Molybdenum steels have been made commercially for twenty-five...

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

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

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

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

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

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

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

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

Piston Pin
The piston pin on an aviation engine must possess maximum res...

The Penetration Of Carbon


Carburized mild steel is used to a great extent in the manufacture
of automobile and other parts which are likely to be subjected to
rough usage. The strength and ability to withstand hard knocks
depend to a very considerable degree on the thoroughness with which
the carburizing process is conducted.

Many automobile manufacturers have at one time or another passed
through a period of unfortunate breakages, or have found that for
a certain period the parts turned out of their hardening shops
were not sufficiently hard to enable the rubbing surfaces to stand
up against the pressure to which they were subjected.

So many factors govern the success of hardening that often this
succession of bad work has been actually overcome without those
interested realizing what was the weak point in their system of
treatment. As the question is one that can create a bad reputation
for the product of any firm it is well to study the influential
factors minutely.

Next: Introduction Of Carbon

Previous: Preparing Parts For Local Case-hardening

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