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Steel Making

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

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

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

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

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

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

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

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

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

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

Double Annealing
Water annealing consists in heating the piece, allowing it to...

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

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

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

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...



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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