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   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

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

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

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

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

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

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

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

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

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

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

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

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

Annealing Method
Forgings which are too hard to machine are put in pots with ...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

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



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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