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

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

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

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

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

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

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

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

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

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

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

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

Alloying Elements
Commercial steels of even the simplest types are therefore p...

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

Lathe And Planer Tools
TO FORGE.--Gently warm the steel to remove any chill is parti...

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

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

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

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



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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