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

Steel Making

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

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

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

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

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

The Thermo-couple
With the application of the thermo-couple, the measurement of...

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

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

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

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

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

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

High Speed Steel
For centuries the secret art of making tool steel was handed ...

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

Nickel
Nickel may be considered as the toughest among the non-rare a...

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

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

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



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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