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Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

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

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

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

Hardening
Steel is hardened by quenching from above the upper critical....

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

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

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

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

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

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

The Electric Process
The fourth method of manufacturing steel is by the electric f...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

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



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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