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   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

Critical Points
One of the most important means of investigating the properti...

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

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

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

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

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

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

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

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

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

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

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

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

The Modern Hardening Room
A hardening room of today means a very different place from ...

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

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

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

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



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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