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

The Forging Of Steel
So much depends upon the forging of steel that this operation...

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

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

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

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

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

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

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

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

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

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

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

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



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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