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Steel Making

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

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

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

Molybdenum steels have been made commercially for twenty-five...

Care In Annealing
Not only will benefits in machining be found by careful anne...

Compensating Leads
By the use of compensating leads, formed of the same materia...

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

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

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

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

Furnace Data
In order to give definite information concerning furnaces, fu...

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

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

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

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

Annealing Method
Forgings which are too hard to machine are put in pots with ...

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

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

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

Annealing Method


Forgings which are too hard to machine are put
in pots with a little charcoal to cause a reducing atmosphere and
to prevent scale. The covers are then luted on and the pots placed
in the furnace. Carbon steel from 15 to 25 points is annealed at
1,600 deg.F. Nickel steel of the same carbon and containing in addition
3-1/2 per cent nickel is annealed at 1,450 deg.F. When the pots are
heated through, they are rolled to the yard and allowed to cool.
This method of annealing gives the best hardness for quick machining.

The requirements in the machine operations are very rigid and, in
spite of great care and probably the finest equipment of special
machines in the world, a small percentage of the product fails
to pass inspection during or at the completion of the machine
operations. These pieces, however, are not a loss, for they play
an important part in the hardening process, indicating as they do
the exact depth of penetration of the carburizing material and
the condition of both case and core.

Next: Heat-treating Department

Previous: Heat-treating Equipment And Methods For Mass Production

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