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Steel Making

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

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

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

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

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

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

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

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

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

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

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

Impact Tests
Impact tests are of considerable importance as an indication ...

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

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



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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