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   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

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

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

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

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

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

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...

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

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

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

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

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

Silicon
SILICON is a very widespread element (symbol Si), being an es...

The Electric Process
The fourth method of manufacturing steel is by the electric f...

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

Air-hardening Steels
These steels are recommended for boring, turning and planing...

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

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

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

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



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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