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

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

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

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

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

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

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

Crucible Steel
Crucible steel is still made by melting material in a clay or...

Alloying Elements
Commercial steels of even the simplest types are therefore p...

Molybdenum
Molybdenum steels have been made commercially for twenty-five...

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

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

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

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

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

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

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

Hardness Testing
The word hardness is used to express various properties of me...

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...



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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