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Steel Making

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

Annealing
There is no mystery or secret about the proper annealing of d...

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

Double Annealing
Water annealing consists in heating the piece, allowing it to...

Hardness Testing
The word hardness is used to express various properties of me...

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

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

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

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

Quenching
It is considered good practice to quench alloy steels from th...

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

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

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

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

The Thermo-couple
With the application of the thermo-couple, the measurement of...



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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