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Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

The Modern Hardening Room
A hardening room of today means a very different place from ...

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

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

The crankshaft was the most highly stressed part of the entir...

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

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

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

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

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

Connecting Rods
The material used for all connecting rods on the Liberty engi...

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

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

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

Nickel may be considered as the toughest among the non-rare a...

Heat Treatment Of Gear Blanks


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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