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Steel Making

Lathe And Planer Tools
TO FORGE.--Gently warm the steel to remove any chill is parti...

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

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

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

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

Piston Pin
The piston pin on an aviation engine must possess maximum res...

Manganese
Manganese adds considerably to the tensile strength of steel,...

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

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

Care In Annealing
Not only will benefits in machining be found by careful anne...

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

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

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

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

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

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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