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

Steel Making

Compensating Leads
By the use of compensating leads, formed of the same materia...

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

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...

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

The Modern Hardening Room
A hardening room of today means a very different place from ...

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

Drop Forging Dies
The kind of steel used in the die of course influences the he...

The Influence Of Size
The size of the piece influences the physical properties obta...

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

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

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

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

Nickel
Nickel may be considered as the toughest among the non-rare a...

Crucible Steel
Crucible steel is still made by melting material in a clay or...

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

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

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

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



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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