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Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

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

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

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

The crankshaft was the most highly stressed part of the entir...

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

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

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

There is no mystery or secret about the proper annealing of d...

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

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

Quenching The Work
In some operations case-hardened work is quenched from the bo...

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

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

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

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

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

Molybdenum steels have been made commercially for twenty-five...

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

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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