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Steel Making

Lathe And Planer Tools
TO FORGE.--Gently warm the steel to remove any chill is parti...

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

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

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

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

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

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

Conclusions
Martien was probably never a serious contender for the honor ...

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

Drop Forging Dies
The kind of steel used in the die of course influences the he...

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

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

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

Impact Tests
Impact tests are of considerable importance as an indication ...

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

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



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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