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Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

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

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

The Thermo-couple
With the application of the thermo-couple, the measurement of...

Conclusions
Martien was probably never a serious contender for the honor ...

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

Sulphur
SULPHUR is another element (symbol S) which is always found i...

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

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

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

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

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

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

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

Quality And Structure
The quality of high-speed steel is dependent to a very great ...



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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