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Steel Making

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

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

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

The Forging Of Steel
So much depends upon the forging of steel that this operation...

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

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

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

Care In Annealing
Not only will benefits in machining be found by careful anne...

Silicon
SILICON is a very widespread element (symbol Si), being an es...

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

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

Sulphur
SULPHUR is another element (symbol S) which is always found i...

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

Lathe And Planer Tools
TO FORGE.--Gently warm the steel to remove any chill is parti...



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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