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

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

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

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

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

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

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

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

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

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

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

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

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...

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

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

Nickel
Nickel may be considered as the toughest among the non-rare a...

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

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



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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