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

Steel Making

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

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

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

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

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

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

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

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

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

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

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

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

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...



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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