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Steel Making

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

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

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

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

Nickel-chromium
A combination of the characteristics of nickel and the charac...

The Thermo-couple
With the application of the thermo-couple, the measurement of...

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

Machineability
Reheating for machine ability was done at 100 deg. less than ...

Care In Annealing
Not only will benefits in machining be found by careful anne...

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

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

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

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

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

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

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

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...



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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