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Steel Making

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

The Forging Of Steel
So much depends upon the forging of steel that this operation...

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

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

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

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

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

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

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

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

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

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

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

Crucible Steel
Crucible steel is still made by melting material in a clay or...

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



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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