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Steel Making

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

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

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

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

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

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

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

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

Piston Pin
The piston pin on an aviation engine must possess maximum res...

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

Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...

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

Bessemer Process
The bessemer process consists of charging molten pig iron int...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

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

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

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



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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