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Steel Making

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

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

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

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

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

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

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

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

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

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

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

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

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

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

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

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



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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