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

Piston Pin
The piston pin on an aviation engine must possess maximum res...

Annealing Work
With the exception of several of the higher types of alloy s...

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

Air-hardening Steels
These steels are recommended for boring, turning and planing...

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

Sulphur
SULPHUR is another element (symbol S) which is always found i...

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

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

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

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

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

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

Connecting Rods
The material used for all connecting rods on the Liberty engi...

Bessemer Process
The bessemer process consists of charging molten pig iron int...

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...



Annealing Work






Category: HEAT TREATMENT OF STEEL

With the exception of several of the higher types
of alloy steels, where the percentages of special elements run quite
high, which causes a slight air-hardening action, the carburizing
steels are soft enough for machining when air cooled from any
temperature, including the finishing temperature at the hammer.
This condition has led many drop-forge and manufacturing concerns
to consider annealing as an unnecessary operation and expense.
In many cases the drop forging has only been heated to a low
temperature, often just until the piece showed color, to relieve
the so-called hammer strains. While this has been only a compromise
it has been better than no reheating at all, although it has not
properly refined the grain, which is necessary for good machining
conditions.

Annealing is heating to a temperature slightly above the highest
critical point and cooling slowly either in the air or in the furnace.
Annealing is done to accomplish two purposes: (1) to relieve mechanical
strains and (2) to soften and produce a maximum refinement of grain.





Next: Process Of Carburizing

Previous: Heat Treatment Of Gear Blanks



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