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Steel Making

Silicon prevents, to a large extent, defects such as gas bubb...

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

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

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

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

Although it is possible to work steels cold, to an extent de...

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

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

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

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

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

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

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

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

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

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

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

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

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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