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Steel Making

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

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

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

High Speed Steel
For centuries the secret art of making tool steel was handed ...

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

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

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

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

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

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

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

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

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

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

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

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

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

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...



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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