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Steel Making

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

Chromium
Chromium when alloyed with steel, has the characteristic func...

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

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

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

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

Annealing Method
Forgings which are too hard to machine are put in pots with ...

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

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

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

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

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

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

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

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

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

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

The Modern Hardening Room
A hardening room of today means a very different place from ...



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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