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Connecting Rods
The material used for all connecting rods on the Liberty engi...

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

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

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Hardening
The forgings can be hardened by cooling in still air or quen...

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

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

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

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

Bessemer Process
The bessemer process consists of charging molten pig iron int...

Heating
Although it is possible to work steels cold, to an extent de...

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

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

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

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

The Electric Process
The fourth method of manufacturing steel is by the electric f...

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

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...



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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