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

Crankshaft
The crankshaft was the most highly stressed part of the entir...

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

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

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

Pyrometers
Armor plate makers sometimes use the copper ball or Siemens' ...

Furnace Data
In order to give definite information concerning furnaces, fu...

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

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

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

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

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

Annealing
There is no mystery or secret about the proper annealing of d...

The Thermo-couple
With the application of the thermo-couple, the measurement of...

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

Gears
The material used for all gears on the Liberty engine was sel...

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

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...



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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