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Steel Making

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

Armor plate makers sometimes use the copper ball or Siemens' ...

The Influence Of Size
The size of the piece influences the physical properties obta...

The Modern Hardening Room
A hardening room of today means a very different place from ...

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

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

Martien was probably never a serious contender for the honor ...

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

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

Phosphorus is one of the impurities in steel, and it has been...

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

The forgings can be hardened by cooling in still air or quen...

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

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

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

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

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

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

Nickel may be considered as the toughest among the non-rare 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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