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Steel Making

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

Manganese
MANGANESE is a metal much like iron. Its chemical symbol is M...

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

Silicon
SILICON is a very widespread element (symbol Si), being an es...

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

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

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

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

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

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

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

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

Crankshaft
The crankshaft was the most highly stressed part of the entir...

Piston Pin
The piston pin on an aviation engine must possess maximum res...

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

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

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

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

Quality And Structure
The quality of high-speed steel is dependent to a very great ...



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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