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Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

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

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

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

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

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

Double Annealing
Water annealing consists in heating the piece, allowing it to...

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

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

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

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

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

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

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

Compensating Leads
By the use of compensating leads, formed of the same materia...



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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