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Steel Making

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

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

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

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

Quenching
It is considered good practice to quench alloy steels from th...

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

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

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

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

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

Drop Forging Dies
The kind of steel used in the die of course influences the he...

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

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

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

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

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...



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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