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

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

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

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

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

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

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

Heating
Although it is possible to work steels cold, to an extent de...

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

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

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

Air-hardening Steels
These steels are recommended for boring, turning and planing...

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

Annealing Work
With the exception of several of the higher types of alloy s...

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

Hardening
The forgings can be hardened by cooling in still air or quen...

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

Annealing
There is no mystery or secret about the proper annealing of d...



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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