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Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

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

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

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

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

Manganese
Manganese adds considerably to the tensile strength of steel,...

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

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

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

Heating
Although it is possible to work steels cold, to an extent de...

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

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

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

Annealing Method
Forgings which are too hard to machine are put in pots with ...

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

Air-hardening Steels
These steels are recommended for boring, turning and planing...

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



Temperature Recording And Regulation






Category: HEAT TREATMENT OF STEEL

Each furnace is equipped
with pyrometers, but the reading and recording of all temperatures
are in the hands of one man, who occupies a room with an opening
into the end of the hardening department. The opening is about 15
ft. above the floor level. On each side of it, easily legible from
all of the furnaces, is a board with the numbers of the various
furnaces, as shown in Figs. 59 and 60. Opposite each furnace number
is a series of hooks whereon are hung metal numbers representing the
pyrometer readings of the temperature in that particular furnace.
Within the room, as shown in Fig. 60, the indicating instrument
is to the right, and to the left is a switchboard to connect it
with the thermo-couples in the various furnaces. The boards shown
to the right and the left swing into the room, which enables the
attendant easily to change the numbers to conform to the pyrometer
readings. Readings of the temperatures of the carburizing furnaces
are taken and tabulated every ten minutes. These, numbered 1 to
10, are shown on the board to the right in Fig. 59. The card shown
in Fig. 61 gives such a record. These records are filed away for
possible future reference.



The temperatures of the reheating furnaces, numbered from 1 to
26 and shown on the board to the left in Fig. 59, are taken every
5 min.

Each furnace has a large metal sign on which is marked the temperature
at which the furnace regulator is required to keep his heat. As
soon as any variation from this is posted on the board outside
the pyrometer room, the attendant sees it and adjusts the burners
to compensate.




DIES FOR GLEASON TEMPERING MACHINES.--In Fig. 62 is shown a set
of dies for the Gleason tempering machine. These accurately made
dies fit and hold the gear true during quenching, thus preventing
distortion.





Next: Hardening Operation

Previous: Testing And Inspection Of Heat Treatment



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