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

Steel Making

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

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

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

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

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

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

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

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

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

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

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

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

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

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

Hardness Testing
The word hardness is used to express various properties of me...

Standard Analysis
The selection of a standard analysis by the manufacturer is t...



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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