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Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

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

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

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

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

Impact Tests
Impact tests are of considerable importance as an indication ...

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

Connecting Rods
The material used for all connecting rods on the Liberty engi...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

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

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

MANGANESE is a metal much like iron. Its chemical symbol is M...

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

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

Drop Forging Dies
The kind of steel used in the die of course influences the he...

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

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

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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