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

Steel Making

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

Hardening
Steel is hardened by quenching from above the upper critical....

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

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

Silicon
SILICON is a very widespread element (symbol Si), being an es...

Conclusions
Martien was probably never a serious contender for the honor ...

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

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

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

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

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

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

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

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

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

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

Piston Pin
The piston pin on an aviation engine must possess maximum res...

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

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...



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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