Decisive results are obtained only by the offensive. Aggressiveness wins battles. If you want to thrash a man go after him; don't wait for him to come to you. When attacking use every available man. Have every man in the proper place at th... Read more of The Theory Of Attack at Military Training.caInformational Site Network Informational
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Steel Making

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

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

High Speed Steel
For centuries the secret art of making tool steel was handed ...

ANNEALING can be done by heating to temperatures ranging from...

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

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

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

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

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

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

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

Tungsten, as an alloy in steel, has been known and used for a...

Piston Pin
The piston pin on an aviation engine must possess maximum res...

Alloying Elements
Commercial steels of even the simplest types are therefore p...

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

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

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

SULPHUR is another element (symbol S) which is always found i...

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

Gas Consumption For Carburizing


Although the advantages offered by the gas-fired furnace for carburizing
have been generally recognized in the past from points of view as
close temperature regulation, decreased attendance, and greater
convenience, very little information has been published regarding
the consumption of gas for this process. It has therefore been a
matter of great difficulty to obtain authentic information upon
this point, either from makers or users of such furnaces.

In view of this, the details of actual consumption of gas on a
regular customer's order job will be of interest. The Revergen
furnace, manufactured by the Davis Furnace Company, Luton, Bedford,
England, was used on this job, and is provided with regenerators
and fired with illuminating gas at ordinary pressure, the air being
introduced to the furnace at a slight pressure of 3 to 4 in. water
gage. The material was charged into a cold furnace, raised to 1,652 deg.F.,
and maintained at that temperature for 8 hr. to give the necessary
depth of case. The work consisted of automobile gears packed in
six boxes, the total weight being 713 lb. The required temperature
of 1,652 deg.F. was obtained in 70 min. from lighting up, and a summary
of the data is shown in the following table:

Cubic Foot Total
Per Pound Number of
of Load Cubic Foot
Gas to raise furnace and charge from
cold to 1,652 deg.F., 70 min. 1.29 925
Gas to maintain 1,652 deg.F. for 1st hour 0.38 275
Gas to maintain 1,652 deg.F. for 2nd hour 0.42 300
Gas to maintain 1,652 deg.F. for 3rd hour 0.38 275
Gas to maintain 1,652 deg.F. for 4th hour 0.42 300
Gas to maintain 1,652 deg.F. for 5th hour 0.49 350
Gas to maintain 1,652 deg.F. for 6th hour 0.49 350
Gas to maintain 1,652 deg.F. for 7th hour 0.45 325
Gas to maintain 1,652 deg.F. for 8th hour 0.45 325

The overall gas consumption for this run of 9 hr. 10 min. was only
4.8 cu. ft. per pound of load.

Next: The Care Of Carburizing Compounds

Previous: A Satisfactory Luting Mixture

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