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Steel Making

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

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

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

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

Pyrometers
Armor plate makers sometimes use the copper ball or Siemens' ...

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

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...

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

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

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

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

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

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

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

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

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

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

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...



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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