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Steel Making

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

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...

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

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

High Speed Steel
For centuries the secret art of making tool steel was handed ...

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

Annealing Work
With the exception of several of the higher types of alloy s...

Manganese
Manganese adds considerably to the tensile strength of steel,...

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

Corrosion
This steel like any other steel when distorted by cold worki...

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

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

Piston Pin
The piston pin on an aviation engine must possess maximum res...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

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

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

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



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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