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Steel Making

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

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

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

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

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

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

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

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

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

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

Double Annealing
Water annealing consists in heating the piece, allowing it to...

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...



Carburizing By Gas






Category: CASE-HARDENING OR SURFACE-CARBURIZING

The process of carburizing by gas, briefly mentioned on page 88,
consists of having a slowly revolving, properly heated, cylindrical
retort into which illuminating gas (a mixture of various hydrocarbons)
is continuously injected under pressure. The spent gases are vented
to insure the greatest speed in carbonizing. The work is constantly
and uniformly exposed to a clean carbonizing atmosphere instead
of partially spent carbonaceous solids which may give off very
complex compounds of phosphorus, sulphur, carbon and nitrogen.

Originally this process was thought to require a gas generator but
it has been discovered that city gas works all right. The gas consists
of vapors derived from petroleum or bituminous coal. Sometimes the
gas supply is diluted by air, to reduce the speed of carburization
and increase the depth.





Next: Preventing Carburizing By Copper-plating

Previous: Case-hardening Treatments For Various Steels



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