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Steel Making

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...

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

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

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

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

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

Drop Forging Dies
The kind of steel used in the die of course influences the he...

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

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

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

The Modern Hardening Room
A hardening room of today means a very different place from ...

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

Sulphur
SULPHUR is another element (symbol S) which is always found i...

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

The Electric Process
The fourth method of manufacturing steel is by the electric f...

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...



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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