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Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

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

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

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

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

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

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

Annealing Method
Forgings which are too hard to machine are put in pots with ...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

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

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

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

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

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

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

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

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

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



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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