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Steel Making

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

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

Double Annealing
Water annealing consists in heating the piece, allowing it to...

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

Compensating Leads
By the use of compensating leads, formed of the same materia...

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

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

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

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

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

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...

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

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

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

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

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

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

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

Drop Forging Dies
The kind of steel used in the die of course influences the he...



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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