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Hardness Testing
The word hardness is used to express various properties of me...

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

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

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

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

MANGANESE is a metal much like iron. Its chemical symbol is M...

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

ANNEALING can be done by heating to temperatures ranging from...

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....

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

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

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

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

A combination of the characteristics of nickel and the charac...

Vanadium has a very marked effect upon alloy steels rich in c...

Steel is hardened by quenching from above the upper critical....

Tungsten, as an alloy in steel, has been known and used for a...

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

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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