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

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

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

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

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

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

Air-hardening Steels
These steels are recommended for boring, turning and planing...

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

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

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

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

Compensating Leads
By the use of compensating leads, formed of the same materia...

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

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

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

Hardness Testing
The word hardness is used to express various properties of me...



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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