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

Machineability
Reheating for machine ability was done at 100 deg. less than ...

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

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

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

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

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

Conclusions
Martien was probably never a serious contender for the honor ...

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

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

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

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

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

The Forging Of Steel
So much depends upon the forging of steel that this operation...

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

Critical Points
One of the most important means of investigating the properti...



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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