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Steel Making

Piston Pin
The piston pin on an aviation engine must possess maximum res...

Furnace Data
In order to give definite information concerning furnaces, fu...

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

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

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

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

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

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

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

High Speed Steel
For centuries the secret art of making tool steel was handed ...

Crucible Steel
Crucible steel is still made by melting material in a clay or...

Pyrometers
Armor plate makers sometimes use the copper ball or Siemens' ...

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

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

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

Quenching
It is considered good practice to quench alloy steels from th...



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.





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Previous: Heat-treating Equipment And Methods For Mass Production



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