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Steel Making

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

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

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

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

Double Annealing
Water annealing consists in heating the piece, allowing it to...

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

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

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

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

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

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

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

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

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

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

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

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

Pyrometers
Armor plate makers sometimes use the copper ball or Siemens' ...



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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