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Steel Making

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

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

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

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

Reheating for machine ability was done at 100 deg. less than ...

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

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

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

The Influence Of Size
The size of the piece influences the physical properties obta...

The Electric Process
The fourth method of manufacturing steel is by the electric f...

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

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

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

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

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

Molybdenum steels have been made commercially for twenty-five...

Temperature Recording And Regulation


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.

of dies for the Gleason tempering machine. These accurately made
dies fit and hold the gear true during quenching, thus preventing

Next: Hardening Operation

Previous: Testing And Inspection Of Heat Treatment

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