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   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

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

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

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

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

Air-hardening Steels
These steels are recommended for boring, turning and planing...

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

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

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

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

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

Furnace Data
In order to give definite information concerning furnaces, fu...

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

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

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

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

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

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

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

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

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...



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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