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Steel Making

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

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

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

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

Annealing Method
Forgings which are too hard to machine are put in pots with ...

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

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

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

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

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

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

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

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

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

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

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



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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