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Silicon
SILICON is a very widespread element (symbol Si), being an es...

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

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

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

The Forging Of Steel
So much depends upon the forging of steel that this operation...

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

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

Gears
The material used for all gears on the Liberty engine was sel...

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

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

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

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

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

Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

Annealing
There is no mystery or secret about the proper annealing of d...

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

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

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

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



High-carbon Machinery Steel






Category: ANNEALING

The carbon content of this steel is above 30 points and is hardly
ever above 60 points or 0.60 per cent. Annealing such steel is
generally in quantity production and does not require the care that
the other steels need because it is very largely a much cheaper
product and a great deal of material is generally removed from
the outside surface.

The purpose for which this steel is annealed is a deciding factor
as to what heat to give it. If it is for machineability only, the
steel requires to be brought up slowly to just below the critical and
then slowly cooled in the furnace or ash pit. It must be thoroughly
covered so that there will be no access of cool air. If the annealing
is to increase ductility to the maximum extent it should be slowly
heated to slightly over the upper critical temperature and kept at
this heat for a length of time necessary for a thorough penetration
to the core, after which it can be cooled to about 1,200 deg.F., then
reheated to about 1,360 deg.F., when it can be removed and put in an
ash pit or covered with lime. If the annealing is just to relieve
strains, slow heating is not necessary, but the steel must be brought
up to a temperature not much less than a forging or rolling heat
and gradually cooled. Covering in this case is only necessary in
steel of a carbon content of more than 40 points.





Next: Annealing In Bone

Previous: Annealing Alloy Steel



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