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Steel Making

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

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

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

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

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

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

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

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

Heating
Although it is possible to work steels cold, to an extent de...

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

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

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

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

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

Nickel-chromium
A combination of the characteristics of nickel and the charac...

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

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

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

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



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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