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Steel Making

Care In Annealing
Not only will benefits in machining be found by careful anne...

Impact Tests
Impact tests are of considerable importance as an indication ...

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

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

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

Manganese
Manganese adds considerably to the tensile strength of steel,...

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

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

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

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

Lathe And Planer Tools
TO FORGE.--Gently warm the steel to remove any chill is parti...

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...

Lathe And Planer Tools
FORGING.--Gently warm the steel to remove any chill, is parti...

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

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

Chromium
Chromium when alloyed with steel, has the characteristic func...

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

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

Machineability
Reheating for machine ability was done at 100 deg. less than ...



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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