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Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

Hardening
Steel is hardened by quenching from above the upper critical....

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

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

Hardening
The forgings can be hardened by cooling in still air or quen...

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

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

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

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

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

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

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

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...

High Speed Steel
For centuries the secret art of making tool steel was handed ...

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

Quenching
It is considered good practice to quench alloy steels from th...



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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