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

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

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

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

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

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

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

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

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

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

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

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

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

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...



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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