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Steel Making

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

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

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

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

Martien was probably never a serious contender for the honor ...

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

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

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

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

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

Lathe And Planer Tools
TO FORGE.--Gently warm the steel to remove any chill is parti...

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

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

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

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

High-carbon Machinery Steel


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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