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Steel Making

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

Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...

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

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

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

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

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

Annealing Work
With the exception of several of the higher types of alloy s...

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

Drop Forging Dies
The kind of steel used in the die of course influences the he...

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

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...

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

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

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

The Influence Of Size
The size of the piece influences the physical properties obta...



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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