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Steel Making

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

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

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...

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

Preparing Parts For Local Case-hardening
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Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

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

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

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

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...

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

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

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

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

Chromium
Chromium when alloyed with steel, has the characteristic func...

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...



Heat Treatment Of Gear Blanks






Category: HEAT TREATMENT OF STEEL

This section is based on a paper read before the American Gear
Manufacturers' Association at White Sulphur Springs, W. Va., Apr.
18, 1918.

Great advancement has been made in the heat treating and hardening of
gears. In this advancement the chemical and metallurgical laboratory
have played no small part. During this time, however, the condition
of the blanks as they come to the machine shop to be machined has
not received its share of attention.

There are two distinct types of gears, both types having their
champions, namely, carburized and heat-treated. The difference
between the two in the matter of steel composition is entirely in
the carbon content, the carbon never running higher than 25-point
in the carburizing type, while in the heat-treated gears the carbon
is seldom lower than 35-point. The difference in the final gear
is the hardness. The carburized gear is file hard on the surface,
with a soft, tough and ductile core to withstand shock, while the
heat-treated gear has a surface that can be touched by a file with
a core of the same hardness as the outer surface.





Next: Annealing Work

Previous: Judging The Heat Of Steel



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