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

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

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

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

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

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

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

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

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

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

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

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

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

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

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

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



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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