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Steel Making

Manganese
Manganese adds considerably to the tensile strength of steel,...

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

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

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

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

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

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

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

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

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

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

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

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

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

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

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

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...

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...



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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