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Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...

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

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

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

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

Compensating Leads
By the use of compensating leads, formed of the same materia...

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

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

Air-hardening Steels
These steels are recommended for boring, turning and planing...

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

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

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

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

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...

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...



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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