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Steel Making

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

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

Hardening
Steel is hardened by quenching from above the upper critical....

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

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

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

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

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

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

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

Manganese
MANGANESE is a metal much like iron. Its chemical symbol is M...

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

Quenching
It is considered good practice to quench alloy steels from th...

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

Chromium
Chromium when alloyed with steel, has the characteristic func...

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

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...



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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