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Steel Making

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

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

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

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

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

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

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

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

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

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

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

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

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

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

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

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...



The Penetration Of Carbon






Category: CASE-HARDENING OR SURFACE-CARBURIZING

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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