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Steel Making

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Gears
The material used for all gears on the Liberty engine was sel...

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

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

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

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

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

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

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

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

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

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

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

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

Crankshaft
The crankshaft was the most highly stressed part of the entir...

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...



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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