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Steel Making

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

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

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

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

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

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

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

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

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

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

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

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

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

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

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...



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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