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Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

Annealing
ANNEALING can be done by heating to temperatures ranging from...

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

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

Molybdenum
Molybdenum steels have been made commercially for twenty-five...

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

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

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

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

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

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

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

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

Alloying Elements
Commercial steels of even the simplest types are therefore p...

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

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

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...



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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