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

Steel Making

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

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

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

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

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

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

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

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

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

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

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

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

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...



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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