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

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

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

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

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

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

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

Molybdenum
Molybdenum steels have been made commercially for twenty-five...

Hardness Testing
The word hardness is used to express various properties of me...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

Gears
The material used for all gears on the Liberty engine was sel...

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

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

Manganese
MANGANESE is a metal much like iron. Its chemical symbol is M...

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

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

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

Conclusions
Martien was probably never a serious contender for the honor ...

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

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



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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