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Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

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

Crucible Steel
Crucible steel is still made by melting material in a clay or...

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

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

Impact Tests
Impact tests are of considerable importance as an indication ...

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

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

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

Connecting Rods
The material used for all connecting rods on the Liberty engi...

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

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

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

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

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



Heat Treatment Of Milling Cutters Drills Reamers Etc






Category: HIGH-SPEED STEEL

THE FIRE.--Gas and electric furnaces designed for high heats are
now made for treating high-speed steels. We recommend them for
treating all kinds of Blue Chip tools and particularly the above
class. After tools reach a yellow heat in the forge fire they must
not be allowed to touch the fuel or come in contact with the blast
or surrounding air.

HEATING.--Tools of this kind should be heated to a mellow white
heat, or as hot as possible without injuring the cutting edges
(2,000 to 2,200 deg.F.). For most work the higher the heat the better
the tool. Where furnaces are used, we recommend preheating the
tools to a red heat in one furnace before putting them in a white
hot furnace.

COOLING.--We recommend quenching all of the above tools in oil
when taken from the fire. We have found fish oil, cottonseed oil,
Houghton's No. 2 soluble oil and linseed oil satisfactory. The
high heat is the important thing in hardening Blue Chip tools.
If a white hot tool is allowed to cool in the open air it will be
hard, but the air scales the tool.

DRAWING THE TEMPER.--Tools of this class should be drawn considerably
more than water-hardening steel for the same purpose.





Next: Heat Treatment Of Punches And Dies Shears Taps Etc

Previous: Heat Treatment Of Lathe Planer And Similar Tools



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