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High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

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

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...

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

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

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

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

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

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

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

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

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

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

Care In Annealing
Not only will benefits in machining be found by careful anne...

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

Impact Tests
Impact tests are of considerable importance as an indication ...



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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