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Steel Making

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

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

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

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

The Electric Process
The fourth method of manufacturing steel is by the electric f...

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

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

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

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

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

The Thermo-couple
With the application of the thermo-couple, the measurement of...

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

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

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

The Forging Of Steel
So much depends upon the forging of steel that this operation...



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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