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Steel Making

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

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

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

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

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

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

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

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

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

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

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

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

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

Nickel-chromium
A combination of the characteristics of nickel and the charac...

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...



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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