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Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

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

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

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

Chromium
Chromium when alloyed with steel, has the characteristic func...

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

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

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

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

Corrosion
This steel like any other steel when distorted by cold worki...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

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

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

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

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...



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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