There was once a shepherd-boy who kept his flock at a little distance from the village. Once he thought he would play a trick on the villagers and have some fun at their expense. So he ran toward the village crying out, with all his might,-- ... Read more of THE BOY WHO CRIED "WOLF!" at Children Stories.caInformational Site Network Informational
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Steel Making

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

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

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

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

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

Molybdenum
Molybdenum steels have been made commercially for twenty-five...

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

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

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

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

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

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

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

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

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

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

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

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...



Double Annealing






Category: HARDENING CARBON STEEL FOR TOOLS

Water annealing consists in heating the piece, allowing it to cool
in air until it loses its red heat and becomes black and then
immediately quenching it in water. This plan works well for very
low-carbon steel; but for high-carbon steel what is known as the
double annealing treatment must be given, provided results are
wanted quickly. The process consists in heating the steel quickly to
200 deg. or more above the upper critical, cooling in air down through
the recalescence point, then reheating it to just above the critical
point and again cooling slowly through the recalescence, then quenching
in oil. This process retains in the steel a fine-grained structure
combined with softness.





Next: Quenching Tool Steel

Previous: Annealing To Relieve Internal Stresses



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