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Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

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

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

Critical Points
One of the most important means of investigating the properti...

Hardening
The forgings can be hardened by cooling in still air or quen...

Nickel
Nickel may be considered as the toughest among the non-rare a...

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

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

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

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

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

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

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

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

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

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

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

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...



Annealing Method






Category: HEAT TREATMENT OF STEEL

Forgings which are too hard to machine are put
in pots with a little charcoal to cause a reducing atmosphere and
to prevent scale. The covers are then luted on and the pots placed
in the furnace. Carbon steel from 15 to 25 points is annealed at
1,600 deg.F. Nickel steel of the same carbon and containing in addition
3-1/2 per cent nickel is annealed at 1,450 deg.F. When the pots are
heated through, they are rolled to the yard and allowed to cool.
This method of annealing gives the best hardness for quick machining.

The requirements in the machine operations are very rigid and, in
spite of great care and probably the finest equipment of special
machines in the world, a small percentage of the product fails
to pass inspection during or at the completion of the machine
operations. These pieces, however, are not a loss, for they play
an important part in the hardening process, indicating as they do
the exact depth of penetration of the carburizing material and
the condition of both case and core.





Next: Heat-treating Department

Previous: Heat-treating Equipment And Methods For Mass Production



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