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

The Influence Of Size
The size of the piece influences the physical properties obta...

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

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

The Thermo-couple
With the application of the thermo-couple, the measurement of...

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

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

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

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

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

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

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



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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