A wound may be defined as a 'breach of continuity in the structures of the body, whether external or internal, suddenly occasioned by mechanical violence.' The law does not define 'a wound,' but the true skin must be broken. Wounds are dan... Read more of Wounds And Mechanical Injuries at Forensic Medicine.caInformational Site Network Informational
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Steel Making

Hardness Testing
The word hardness is used to express various properties of me...

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

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

Annealing Method
Forgings which are too hard to machine are put in pots with ...

SILICON is a very widespread element (symbol Si), being an es...

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

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

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

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

This steel like any other steel when distorted by cold worki...

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

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

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

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

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

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

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

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

Annealing Work


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

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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