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Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

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

Chromium
Chromium when alloyed with steel, has the characteristic func...

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

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

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

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

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

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

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

Crankshaft
The crankshaft was the most highly stressed part of the entir...

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

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

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

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

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

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

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...



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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