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Steel Making

Silicon
SILICON is a very widespread element (symbol Si), being an es...

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

Annealing
There is no mystery or secret about the proper annealing of d...

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

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

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

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

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

Sulphur
SULPHUR is another element (symbol S) which is always found i...

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

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

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

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

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

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

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

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

Lathe And Planer Tools
TO FORGE.--Gently warm the steel to remove any chill is parti...

Crucible Steel
Crucible steel is still made by melting material in a clay or...



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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