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Steel Making

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

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

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

Reheating for machine ability was done at 100 deg. less than ...

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

Connecting Rods
The material used for all connecting rods on the Liberty engi...

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

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

High Speed Steel
For centuries the secret art of making tool steel was handed ...

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

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

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

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

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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