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Steel Making

Double Annealing
Water annealing consists in heating the piece, allowing it to...

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

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

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

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

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

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

Gears
The material used for all gears on the Liberty engine was sel...

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

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

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

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

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

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

The Thermo-couple
With the application of the thermo-couple, the measurement of...



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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