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Steel Making

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

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

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

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

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

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

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

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

Corrosion
This steel like any other steel when distorted by cold worki...

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

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

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

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

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

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

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

Silicon
SILICON is a very widespread element (symbol Si), being an es...



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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