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

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

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

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

Nickel
Nickel may be considered as the toughest among the non-rare a...

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

Molybdenum
Molybdenum steels have been made commercially for twenty-five...

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

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

Crankshaft
The crankshaft was the most highly stressed part of the entir...

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

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

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

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

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

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

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

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

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



Heat Treatment Of Steel






Category: HEAT TREATMENT OF STEEL

Heat treatment consists in heating and cooling metal at definite
rates in order to change its physical condition. Many objects may
be attained by correct heat treatment, but nothing much can be
expected unless the man who directs the operations knows what is
the essential difference in a piece of steel at room temperature
and at a red heat, other than the obvious fact that it is hot. The
science of metallography has been developed in the past 25 years,
and aided by precise methods of measuring temperature, has done
much to systematize the information which we possess on metallic
alloys, and steel in particular.





Next: Critical Points

Previous: Blending The Compound



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