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Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

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

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

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

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

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 ...

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

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

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

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

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

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

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

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

Annealing
ANNEALING can be done by heating to temperatures ranging from...

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

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

Air-hardening Steels
These steels are recommended for boring, turning and planing...



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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