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Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

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

Hardening
The forgings can be hardened by cooling in still air or quen...

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

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

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

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

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

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

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

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

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...

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

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

Care In Annealing
Not only will benefits in machining be found by careful anne...

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



Annealing Work






Category: HEAT TREATMENT OF STEEL

With the exception of several of the higher types
of alloy steels, where the percentages of special elements run quite
high, which causes a slight air-hardening action, the carburizing
steels are soft enough for machining when air cooled from any
temperature, including the finishing temperature at the hammer.
This condition has led many drop-forge and manufacturing concerns
to consider annealing as an unnecessary operation and expense.
In many cases the drop forging has only been heated to a low
temperature, often just until the piece showed color, to relieve
the so-called hammer strains. While this has been only a compromise
it has been better than no reheating at all, although it has not
properly refined the grain, which is necessary for good machining
conditions.

Annealing is heating to a temperature slightly above the highest
critical point and cooling slowly either in the air or in the furnace.
Annealing is done to accomplish two purposes: (1) to relieve mechanical
strains and (2) to soften and produce a maximum refinement of grain.





Next: Process Of Carburizing

Previous: Heat Treatment Of Gear Blanks



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