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

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

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

Annealing Work
With the exception of several of the higher types of alloy s...

Lathe And Planer Tools
TO FORGE.--Gently warm the steel to remove any chill is parti...

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

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

The Forging Of Steel
So much depends upon the forging of steel that this operation...

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

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

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

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

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

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

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



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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