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

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

Manganese
Manganese adds considerably to the tensile strength of steel,...

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

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

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

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

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

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

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

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

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

Quenching
It is considered good practice to quench alloy steels from th...

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

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

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

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

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

Making Steel Balls
Steel balls are made from rods or coils according to size, st...



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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