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Furnace Data
In order to give definite information concerning furnaces, fu...

Chromium
Chromium when alloyed with steel, has the characteristic func...

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

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

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

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

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

The Influence Of Size
The size of the piece influences the physical properties obta...

Hardness Testing
The word hardness is used to express various properties of me...

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

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

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

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

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

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

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

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

Annealing
There is no mystery or secret about the proper annealing of d...



Effects Of Proper Annealing






Category: HEAT TREATMENT OF STEEL

Proper annealing of low-carbon steels
causes a complete solution or combination to take place between
the ferrite and pearlite, producing a homogeneous mass of small
grains of each, the grains of the pearlite being surrounded by
grains of ferrite. A steel of this refinement will machine to good
advantage, due to the fact that the cutting tool will at all times
be in contact with metal of uniform composition.

While the alternate bands of ferrite and pearlite are microscopically
sized, it has been found that with a Gleason or Fellows gear-cutting
machine that rough cutting can be traced to poorly annealed steels,
having either a pronounced banded structure or a coarse granular
structure.





Next: Temperature For Annealing

Previous: Process Of Carburizing



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