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Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

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

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

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

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

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

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

Gears
The material used for all gears on the Liberty engine was sel...

Connecting Rods
The material used for all connecting rods on the Liberty engi...

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

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

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

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...



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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