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Steel Making

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

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

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

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

Nickel-chromium
A combination of the characteristics of nickel and the charac...

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

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

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

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

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...

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

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

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

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

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

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

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

Chromium
Chromium when alloyed with steel, has the characteristic func...



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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