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Steel Making

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

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

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

Double Annealing
Water annealing consists in heating the piece, allowing it to...

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

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

Compensating Leads
By the use of compensating leads, formed of the same materia...

Corrosion
This steel like any other steel when distorted by cold worki...

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

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

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

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

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

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



Steel Can Be Worked Cold






Category: THE FORGING OF STEEL

As noted above, steel can be worked cold,
as in the case of cold-rolled steel. Heat treatment of cold-worked
steel is a very delicate operation. Cold working hardens and strengthens
steel. It also introduces internal stresses. Heat-treatments are
designed to eliminate the stresses without losing the hardness
and strength. This is done by tempering at a low heat. Avoid the
blue range (350 to 750 deg.C.). Tempering for a considerable time just
under the critical is liable to cause great brittleness. Annealing
(reheating through the critical) destroys the effect of cold work.





Next: Forging High-speed Steel

Previous: Steel Worked In Austenitic State



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