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Steel Making

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

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

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

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

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

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

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...

Annealing
There is no mystery or secret about the proper annealing of d...

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

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

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

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

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

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

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

Nickel
Nickel may be considered as the toughest among the non-rare a...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...



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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