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Steel Making

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

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

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

Corrosion
This steel like any other steel when distorted by cold worki...

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

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

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

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

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

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

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

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

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

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

The Modern Hardening Room
A hardening room of today means a very different place from ...

Piston Pin
The piston pin on an aviation engine must possess maximum res...



Preventing Decarbonization Of Tool Steel






Category: HARDENING CARBON STEEL FOR TOOLS

It is especially important to prevent decarbonization in such tools
as taps and form cutters, which must keep their shape after hardening
and which cannot be ground away on the profile. For this reason
it is well to put taps, reamers and the like into pieces of pipe
in heating them. The pipe need be closed on one end only, as the
air will not circulate readily unless there is an opening at both
ends.

Even if used in connection with a blacksmith's forge the lead bath
has an advantage for heating tools of complicated shapes, since
it is easier to heat them uniformly and they are submerged and
away from the air. The lead must be stirred frequently or the heat
is not uniform in all parts of the lead bath. Covering the lead
with powdered charcoal will largely prevent oxidization and waste
of lead.

Such a bath is good for temperatures between 620 and 1,150 deg.F. At
higher temperatures there is much waste of lead.





Next: Annealing To Relieve Internal Stresses

Previous: Steel For Chisels And Punches



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