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   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

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

Double Annealing
Water annealing consists in heating the piece, allowing it to...

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

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

Crucible Steel
Crucible steel is still made by melting material in a clay or...

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

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

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

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

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

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

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

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

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

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

The Forging Of Steel
So much depends upon the forging of steel that this operation...



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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