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Sulphur
SULPHUR is another element (symbol S) which is always found i...

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

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

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

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

Bessemer Process
The bessemer process consists of charging molten pig iron int...

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

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

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

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

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

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

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

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

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

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

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

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

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

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...



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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