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Steel Making

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

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

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

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

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

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

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

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

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

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

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

Pyrometers
Armor plate makers sometimes use the copper ball or Siemens' ...

Nickel-chromium
A combination of the characteristics of nickel and the charac...

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

Conclusions
Martien was probably never a serious contender for the honor ...

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

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

Manganese
MANGANESE is a metal much like iron. Its chemical symbol is M...

Machineability
Reheating for machine ability was done at 100 deg. less than ...



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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