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Steel Making

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

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

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

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

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

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

Crucible Steel
Crucible steel is still made by melting material in a clay or...

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

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

Hardening
Steel is hardened by quenching from above the upper critical....

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

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

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

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

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

Piston Pin
The piston pin on an aviation engine must possess maximum res...



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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