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Steel Making

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

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

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

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

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

Annealing Work
With the exception of several of the higher types of alloy s...

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

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

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

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

Gears
The material used for all gears on the Liberty engine was sel...

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

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

Conclusions
Martien was probably never a serious contender for the honor ...

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

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

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

Connecting Rods
The material used for all connecting rods on the Liberty engi...

The Thermo-couple
With the application of the thermo-couple, the measurement of...



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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