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

Impact Tests
Impact tests are of considerable importance as an indication ...

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

Annealing Work
With the exception of several of the higher types of alloy s...

Furnace Data
In order to give definite information concerning furnaces, fu...

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

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

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

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

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

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

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

Drop Forging Dies
The kind of steel used in the die of course influences the he...

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

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

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

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



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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