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Steel Making

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

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

The Electric Process
The fourth method of manufacturing steel is by the electric f...

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

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

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

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

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

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

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

Alloying Elements
Commercial steels of even the simplest types are therefore p...

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

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

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

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

Air-hardening Steels
These steels are recommended for boring, turning and planing...

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

Lathe And Planer Tools
FORGING.--Gently warm the steel to remove any chill, is parti...



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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