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

Steel Making

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

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

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

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

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

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

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

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

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

Critical Points
One of the most important means of investigating the properti...

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Annealing
ANNEALING can be done by heating to temperatures ranging from...

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

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

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

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

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

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



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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