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Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

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

Chromium
Chromium when alloyed with steel, has the characteristic func...

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

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

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

High Speed Steel
For centuries the secret art of making tool steel was handed ...

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

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

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

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

Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...

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

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

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

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...



Heat Treatment Of Punches And Dies Shears Taps Etc






Category: HIGH-SPEED STEEL

HEATING.--The degree to which tools of the above classes should
be heated depends upon the shape, size and use for which they are
intended. Generally, they should not be heated to quite as high a
heat as lathe tools or milling cutters. They should have a high
heat, but not enough to make the flux run on the steel (by pyrometer
1,900 to 2,100 deg.F.).

COOLING.--Depending on the tools, some should be dipped in oil
all over, some only part way, and others allowed to cool down in
the air naturally, or under air blast. In cooling, the toughness
is retained by allowing some parts to cool slowly and quenching
parts that should be hard.

DRAWING THE TEMPER.--As in cooling, some parts of these tools will
require more drawing than others, but, on the whole, they must
be drawn more than water hardening tools for the same purpose or
to about 500 deg.F. all over, so that a good file will just touch
the cutting or working parts.

BARIUM CHLORIDE PROCESS.--This is a process developed for treating
certain classes of tools, such as taps, forming tools, etc. It is
being successfully used in many large plants. Briefly the treatment
is as follows:

In this treatment the tools are first preheated to a red heat,
but small tools may be immersed without preheating. The barium
chloride bath is kept at a temperature of from 2,000 to 2,100 deg.F.,
and tools are held in it long enough to reach the same temperature.
They are then dipped in oil. The barium chloride which adheres
to the tools is brushed off, leaving the tools as dean as before
heating.





Next: A Chromium-cobalt Steel

Previous: Heat Treatment Of Milling Cutters Drills Reamers Etc



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