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Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

Manganese
Manganese adds considerably to the tensile strength of steel,...

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

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

Annealing Work
With the exception of several of the higher types of alloy s...

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

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

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

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

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

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

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...

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

Chromium
Chromium when alloyed with steel, has the characteristic func...

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

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

The Quenching Tank
The quenching tank is an important feature of apparatus in c...



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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