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

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

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

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

Tungsten, as an alloy in steel, has been known and used for a...

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

Steel is hardened by quenching from above the upper critical....

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

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

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

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

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

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

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

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

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

Annealing Work


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

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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