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Steel Making

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

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

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

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

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

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

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

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

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

Critical Points
One of the most important means of investigating the properti...

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

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

Piston Pin
The piston pin on an aviation engine must possess maximum res...

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

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

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

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

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