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Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

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

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

Connecting Rods
The material used for all connecting rods on the Liberty engi...

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

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

Bessemer Process
The bessemer process consists of charging molten pig iron int...

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

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

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

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

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

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

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

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...



Annealing Method






Category: HEAT TREATMENT OF STEEL

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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