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

Steel Making

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

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

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

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

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

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

Pyrometers
Armor plate makers sometimes use the copper ball or Siemens' ...

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

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

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

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

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

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

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

Nickel-chromium
A combination of the characteristics of nickel and the charac...



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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