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Steel Making

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

Hardening
The forgings can be hardened by cooling in still air or quen...

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

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

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

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...

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

Critical Points
One of the most important means of investigating the properti...

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

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

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

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

Alloying Elements
Commercial steels of even the simplest types are therefore p...

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

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

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

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

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

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...



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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