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Steel Making

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

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

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

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

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

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

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

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Tungsten, as an alloy in steel, has been known and used for a...

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

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

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

Annealing Work
With the exception of several of the higher types of alloy s...

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

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

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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