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Steel Making

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

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

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

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

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

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

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

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

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

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

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

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

Refining The Grain
This is remedied by reheating the piece to a temperature slig...



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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