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Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

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

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

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

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

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

Crucible Steel
Crucible steel is still made by melting material in a clay or...

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

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

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

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

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

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

Critical Points
One of the most important means of investigating the properti...

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

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



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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