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   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

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

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

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

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

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

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

Alloying Elements
Commercial steels of even the simplest types are therefore p...

Furnace Data
In order to give definite information concerning furnaces, fu...

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

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

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

Quenching The Work
In some operations case-hardened work is quenched from the bo...

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

Hardening
Steel is hardened by quenching from above the upper critical....

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

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

Piston Pin
The piston pin on an aviation engine must possess maximum res...

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



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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