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Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

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

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...

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

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

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

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

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

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

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

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

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

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



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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