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Steel Making

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

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

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

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

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

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

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

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

The Thermo-couple
With the application of the thermo-couple, the measurement of...

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

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

Bessemer Process
The bessemer process consists of charging molten pig iron int...

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

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

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...



Gas Consumption For Carburizing






Category: CASE-HARDENING OR SURFACE-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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