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

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

Although it is possible to work steels cold, to an extent de...

Armor plate makers sometimes use the copper ball or Siemens' ...

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

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

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

The Modern Hardening Room
A hardening room of today means a very different place from ...

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

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

PHOSPHORUS is an element (symbol P) which enters the metal fr...

Martien was probably never a serious contender for the honor ...

Critical Points
One of the most important means of investigating the properti...

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

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

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

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

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

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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