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Steel Making

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

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

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

Bessemer Process
The bessemer process consists of charging molten pig iron int...

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

Air-hardening Steels
These steels are recommended for boring, turning and planing...

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

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

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

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

The Thermo-couple
With the application of the thermo-couple, the measurement of...

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

Annealing
ANNEALING can be done by heating to temperatures ranging from...

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

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...



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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